classFileParser.cpp revision 9149:a8a8604f890f
1/* 2 * Copyright (c) 1997, 2015, 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.inline.hpp" 29#include "classfile/defaultMethods.hpp" 30#include "classfile/javaClasses.inline.hpp" 31#include "classfile/symbolTable.hpp" 32#include "classfile/systemDictionary.hpp" 33#include "classfile/verificationType.hpp" 34#include "classfile/verifier.hpp" 35#include "classfile/vmSymbols.hpp" 36#include "gc/shared/gcLocker.hpp" 37#include "memory/allocation.hpp" 38#include "memory/metadataFactory.hpp" 39#include "memory/oopFactory.hpp" 40#include "memory/referenceType.hpp" 41#include "memory/resourceArea.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/exceptions.hpp" 63#include "utilities/globalDefinitions.hpp" 64#include "utilities/macros.hpp" 65#include "utilities/ostream.hpp" 66#include "utilities/resourceHash.hpp" 67#if INCLUDE_CDS 68#include "classfile/systemDictionaryShared.hpp" 69#endif 70 71// We generally try to create the oops directly when parsing, rather than 72// allocating temporary data structures and copying the bytes twice. A 73// temporary area is only needed when parsing utf8 entries in the constant 74// pool and when parsing line number tables. 75 76// We add assert in debug mode when class format is not checked. 77 78#define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 79#define JAVA_MIN_SUPPORTED_VERSION 45 80#define JAVA_MAX_SUPPORTED_VERSION 52 81#define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 82 83// Used for two backward compatibility reasons: 84// - to check for new additions to the class file format in JDK1.5 85// - to check for bug fixes in the format checker in JDK1.5 86#define JAVA_1_5_VERSION 49 87 88// Used for backward compatibility reasons: 89// - to check for javac bug fixes that happened after 1.5 90// - also used as the max version when running in jdk6 91#define JAVA_6_VERSION 50 92 93// Used for backward compatibility reasons: 94// - to check NameAndType_info signatures more aggressively 95#define JAVA_7_VERSION 51 96 97// Extension method support. 98#define JAVA_8_VERSION 52 99 100void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) { 101 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 102 // this function (_current can be allocated in a register, with scalar 103 // replacement of aggregates). The _current pointer is copied back to 104 // stream() when this function returns. DON'T call another method within 105 // this method that uses stream(). 106 ClassFileStream* cfs0 = stream(); 107 ClassFileStream cfs1 = *cfs0; 108 ClassFileStream* cfs = &cfs1; 109#ifdef ASSERT 110 assert(cfs->allocated_on_stack(),"should be local"); 111 u1* old_current = cfs0->current(); 112#endif 113 Handle class_loader(THREAD, _loader_data->class_loader()); 114 115 // Used for batching symbol allocations. 116 const char* names[SymbolTable::symbol_alloc_batch_size]; 117 int lengths[SymbolTable::symbol_alloc_batch_size]; 118 int indices[SymbolTable::symbol_alloc_batch_size]; 119 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 120 int names_count = 0; 121 122 // parsing Index 0 is unused 123 for (int index = 1; index < length; index++) { 124 // Each of the following case guarantees one more byte in the stream 125 // for the following tag or the access_flags following constant pool, 126 // so we don't need bounds-check for reading tag. 127 u1 tag = cfs->get_u1_fast(); 128 switch (tag) { 129 case JVM_CONSTANT_Class : 130 { 131 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 132 u2 name_index = cfs->get_u2_fast(); 133 _cp->klass_index_at_put(index, name_index); 134 } 135 break; 136 case JVM_CONSTANT_Fieldref : 137 { 138 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 139 u2 class_index = cfs->get_u2_fast(); 140 u2 name_and_type_index = cfs->get_u2_fast(); 141 _cp->field_at_put(index, class_index, name_and_type_index); 142 } 143 break; 144 case JVM_CONSTANT_Methodref : 145 { 146 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 147 u2 class_index = cfs->get_u2_fast(); 148 u2 name_and_type_index = cfs->get_u2_fast(); 149 _cp->method_at_put(index, class_index, name_and_type_index); 150 } 151 break; 152 case JVM_CONSTANT_InterfaceMethodref : 153 { 154 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 155 u2 class_index = cfs->get_u2_fast(); 156 u2 name_and_type_index = cfs->get_u2_fast(); 157 _cp->interface_method_at_put(index, class_index, name_and_type_index); 158 } 159 break; 160 case JVM_CONSTANT_String : 161 { 162 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 163 u2 string_index = cfs->get_u2_fast(); 164 _cp->string_index_at_put(index, string_index); 165 } 166 break; 167 case JVM_CONSTANT_MethodHandle : 168 case JVM_CONSTANT_MethodType : 169 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 170 classfile_parse_error( 171 "Class file version does not support constant tag %u in class file %s", 172 tag, CHECK); 173 } 174 if (tag == JVM_CONSTANT_MethodHandle) { 175 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 176 u1 ref_kind = cfs->get_u1_fast(); 177 u2 method_index = cfs->get_u2_fast(); 178 _cp->method_handle_index_at_put(index, ref_kind, method_index); 179 } else if (tag == JVM_CONSTANT_MethodType) { 180 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 181 u2 signature_index = cfs->get_u2_fast(); 182 _cp->method_type_index_at_put(index, signature_index); 183 } else { 184 ShouldNotReachHere(); 185 } 186 break; 187 case JVM_CONSTANT_InvokeDynamic : 188 { 189 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 190 classfile_parse_error( 191 "Class file version does not support constant tag %u in class file %s", 192 tag, CHECK); 193 } 194 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 195 u2 bootstrap_specifier_index = cfs->get_u2_fast(); 196 u2 name_and_type_index = cfs->get_u2_fast(); 197 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) 198 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 199 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 200 } 201 break; 202 case JVM_CONSTANT_Integer : 203 { 204 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 205 u4 bytes = cfs->get_u4_fast(); 206 _cp->int_at_put(index, (jint) bytes); 207 } 208 break; 209 case JVM_CONSTANT_Float : 210 { 211 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 212 u4 bytes = cfs->get_u4_fast(); 213 _cp->float_at_put(index, *(jfloat*)&bytes); 214 } 215 break; 216 case JVM_CONSTANT_Long : 217 // A mangled type might cause you to overrun allocated memory 218 guarantee_property(index+1 < length, 219 "Invalid constant pool entry %u in class file %s", 220 index, CHECK); 221 { 222 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 223 u8 bytes = cfs->get_u8_fast(); 224 _cp->long_at_put(index, bytes); 225 } 226 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 227 break; 228 case JVM_CONSTANT_Double : 229 // A mangled type might cause you to overrun allocated memory 230 guarantee_property(index+1 < length, 231 "Invalid constant pool entry %u in class file %s", 232 index, CHECK); 233 { 234 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 235 u8 bytes = cfs->get_u8_fast(); 236 _cp->double_at_put(index, *(jdouble*)&bytes); 237 } 238 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 239 break; 240 case JVM_CONSTANT_NameAndType : 241 { 242 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 243 u2 name_index = cfs->get_u2_fast(); 244 u2 signature_index = cfs->get_u2_fast(); 245 _cp->name_and_type_at_put(index, name_index, signature_index); 246 } 247 break; 248 case JVM_CONSTANT_Utf8 : 249 { 250 cfs->guarantee_more(2, CHECK); // utf8_length 251 u2 utf8_length = cfs->get_u2_fast(); 252 u1* utf8_buffer = cfs->get_u1_buffer(); 253 assert(utf8_buffer != NULL, "null utf8 buffer"); 254 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 255 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 256 cfs->skip_u1_fast(utf8_length); 257 258 // Before storing the symbol, make sure it's legal 259 if (_need_verify) { 260 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); 261 } 262 263 if (has_cp_patch_at(index)) { 264 Handle patch = clear_cp_patch_at(index); 265 guarantee_property(java_lang_String::is_instance(patch()), 266 "Illegal utf8 patch at %d in class file %s", 267 index, CHECK); 268 char* str = java_lang_String::as_utf8_string(patch()); 269 // (could use java_lang_String::as_symbol instead, but might as well batch them) 270 utf8_buffer = (u1*) str; 271 utf8_length = (int) strlen(str); 272 } 273 274 unsigned int hash; 275 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); 276 if (result == NULL) { 277 names[names_count] = (char*)utf8_buffer; 278 lengths[names_count] = utf8_length; 279 indices[names_count] = index; 280 hashValues[names_count++] = hash; 281 if (names_count == SymbolTable::symbol_alloc_batch_size) { 282 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 283 names_count = 0; 284 } 285 } else { 286 _cp->symbol_at_put(index, result); 287 } 288 } 289 break; 290 default: 291 classfile_parse_error( 292 "Unknown constant tag %u in class file %s", tag, CHECK); 293 break; 294 } 295 } 296 297 // Allocate the remaining symbols 298 if (names_count > 0) { 299 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 300 } 301 302 // Copy _current pointer of local copy back to stream(). 303#ifdef ASSERT 304 assert(cfs0->current() == old_current, "non-exclusive use of stream()"); 305#endif 306 cfs0->set_current(cfs1.current()); 307} 308 309bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } 310 311inline Symbol* check_symbol_at(constantPoolHandle cp, int index) { 312 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) 313 return cp->symbol_at(index); 314 else 315 return NULL; 316} 317 318PRAGMA_DIAG_PUSH 319PRAGMA_FORMAT_NONLITERAL_IGNORED 320void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) { 321 ResourceMark rm(THREAD); 322 fatal(msg, _class_name->as_C_string()); 323} 324 325void ClassFileParser::report_assert_property_failure(const char* msg, int index, TRAPS) { 326 ResourceMark rm(THREAD); 327 fatal(msg, index, _class_name->as_C_string()); 328} 329PRAGMA_DIAG_POP 330 331constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { 332 ClassFileStream* cfs = stream(); 333 constantPoolHandle nullHandle; 334 335 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag 336 u2 length = cfs->get_u2_fast(); 337 guarantee_property( 338 length >= 1, "Illegal constant pool size %u in class file %s", 339 length, CHECK_(nullHandle)); 340 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length, 341 CHECK_(nullHandle)); 342 _cp = constant_pool; // save in case of errors 343 constantPoolHandle cp (THREAD, constant_pool); 344 345 // parsing constant pool entries 346 parse_constant_pool_entries(length, CHECK_(nullHandle)); 347 348 int index = 1; // declared outside of loops for portability 349 350 // first verification pass - validate cross references and fixup class and string constants 351 for (index = 1; index < length; index++) { // Index 0 is unused 352 jbyte tag = cp->tag_at(index).value(); 353 switch (tag) { 354 case JVM_CONSTANT_Class : 355 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 356 break; 357 case JVM_CONSTANT_Fieldref : 358 // fall through 359 case JVM_CONSTANT_Methodref : 360 // fall through 361 case JVM_CONSTANT_InterfaceMethodref : { 362 if (!_need_verify) break; 363 int klass_ref_index = cp->klass_ref_index_at(index); 364 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 365 check_property(valid_klass_reference_at(klass_ref_index), 366 "Invalid constant pool index %u in class file %s", 367 klass_ref_index, 368 CHECK_(nullHandle)); 369 check_property(valid_cp_range(name_and_type_ref_index, length) && 370 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 371 "Invalid constant pool index %u in class file %s", 372 name_and_type_ref_index, 373 CHECK_(nullHandle)); 374 break; 375 } 376 case JVM_CONSTANT_String : 377 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 378 break; 379 case JVM_CONSTANT_Integer : 380 break; 381 case JVM_CONSTANT_Float : 382 break; 383 case JVM_CONSTANT_Long : 384 case JVM_CONSTANT_Double : 385 index++; 386 check_property( 387 (index < length && cp->tag_at(index).is_invalid()), 388 "Improper constant pool long/double index %u in class file %s", 389 index, CHECK_(nullHandle)); 390 break; 391 case JVM_CONSTANT_NameAndType : { 392 if (!_need_verify) break; 393 int name_ref_index = cp->name_ref_index_at(index); 394 int signature_ref_index = cp->signature_ref_index_at(index); 395 check_property(valid_symbol_at(name_ref_index), 396 "Invalid constant pool index %u in class file %s", 397 name_ref_index, CHECK_(nullHandle)); 398 check_property(valid_symbol_at(signature_ref_index), 399 "Invalid constant pool index %u in class file %s", 400 signature_ref_index, CHECK_(nullHandle)); 401 break; 402 } 403 case JVM_CONSTANT_Utf8 : 404 break; 405 case JVM_CONSTANT_UnresolvedClass : // fall-through 406 case JVM_CONSTANT_UnresolvedClassInError: 407 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 408 break; 409 case JVM_CONSTANT_ClassIndex : 410 { 411 int class_index = cp->klass_index_at(index); 412 check_property(valid_symbol_at(class_index), 413 "Invalid constant pool index %u in class file %s", 414 class_index, CHECK_(nullHandle)); 415 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 416 } 417 break; 418 case JVM_CONSTANT_StringIndex : 419 { 420 int string_index = cp->string_index_at(index); 421 check_property(valid_symbol_at(string_index), 422 "Invalid constant pool index %u in class file %s", 423 string_index, CHECK_(nullHandle)); 424 Symbol* sym = cp->symbol_at(string_index); 425 cp->unresolved_string_at_put(index, sym); 426 } 427 break; 428 case JVM_CONSTANT_MethodHandle : 429 { 430 int ref_index = cp->method_handle_index_at(index); 431 check_property( 432 valid_cp_range(ref_index, length), 433 "Invalid constant pool index %u in class file %s", 434 ref_index, CHECK_(nullHandle)); 435 constantTag tag = cp->tag_at(ref_index); 436 int ref_kind = cp->method_handle_ref_kind_at(index); 437 switch (ref_kind) { 438 case JVM_REF_getField: 439 case JVM_REF_getStatic: 440 case JVM_REF_putField: 441 case JVM_REF_putStatic: 442 check_property( 443 tag.is_field(), 444 "Invalid constant pool index %u in class file %s (not a field)", 445 ref_index, CHECK_(nullHandle)); 446 break; 447 case JVM_REF_invokeVirtual: 448 case JVM_REF_newInvokeSpecial: 449 check_property( 450 tag.is_method(), 451 "Invalid constant pool index %u in class file %s (not a method)", 452 ref_index, CHECK_(nullHandle)); 453 break; 454 case JVM_REF_invokeStatic: 455 case JVM_REF_invokeSpecial: 456 check_property(tag.is_method() || 457 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 458 "Invalid constant pool index %u in class file %s (not a method)", 459 ref_index, CHECK_(nullHandle)); 460 break; 461 case JVM_REF_invokeInterface: 462 check_property( 463 tag.is_interface_method(), 464 "Invalid constant pool index %u in class file %s (not an interface method)", 465 ref_index, CHECK_(nullHandle)); 466 break; 467 default: 468 classfile_parse_error( 469 "Bad method handle kind at constant pool index %u in class file %s", 470 index, CHECK_(nullHandle)); 471 } 472 // Keep the ref_index unchanged. It will be indirected at link-time. 473 } 474 break; 475 case JVM_CONSTANT_MethodType : 476 { 477 int ref_index = cp->method_type_index_at(index); 478 check_property(valid_symbol_at(ref_index), 479 "Invalid constant pool index %u in class file %s", 480 ref_index, CHECK_(nullHandle)); 481 } 482 break; 483 case JVM_CONSTANT_InvokeDynamic : 484 { 485 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index); 486 check_property(valid_cp_range(name_and_type_ref_index, length) && 487 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 488 "Invalid constant pool index %u in class file %s", 489 name_and_type_ref_index, 490 CHECK_(nullHandle)); 491 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available 492 break; 493 } 494 default: 495 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 496 ShouldNotReachHere(); 497 break; 498 } // end of switch 499 } // end of for 500 501 if (_cp_patches != NULL) { 502 // need to treat this_class specially... 503 int this_class_index; 504 { 505 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 506 u1* mark = cfs->current(); 507 u2 flags = cfs->get_u2_fast(); 508 this_class_index = cfs->get_u2_fast(); 509 cfs->set_current(mark); // revert to mark 510 } 511 512 for (index = 1; index < length; index++) { // Index 0 is unused 513 if (has_cp_patch_at(index)) { 514 guarantee_property(index != this_class_index, 515 "Illegal constant pool patch to self at %d in class file %s", 516 index, CHECK_(nullHandle)); 517 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); 518 } 519 } 520 } 521 522 if (!_need_verify) { 523 return cp; 524 } 525 526 // second verification pass - checks the strings are of the right format. 527 // but not yet to the other entries 528 for (index = 1; index < length; index++) { 529 jbyte tag = cp->tag_at(index).value(); 530 switch (tag) { 531 case JVM_CONSTANT_UnresolvedClass: { 532 Symbol* class_name = cp->klass_name_at(index); 533 // check the name, even if _cp_patches will overwrite it 534 verify_legal_class_name(class_name, CHECK_(nullHandle)); 535 break; 536 } 537 case JVM_CONSTANT_NameAndType: { 538 if (_need_verify && _major_version >= JAVA_7_VERSION) { 539 int sig_index = cp->signature_ref_index_at(index); 540 int name_index = cp->name_ref_index_at(index); 541 Symbol* name = cp->symbol_at(name_index); 542 Symbol* sig = cp->symbol_at(sig_index); 543 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 544 verify_legal_method_signature(name, sig, CHECK_(nullHandle)); 545 } else { 546 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 547 } 548 } 549 break; 550 } 551 case JVM_CONSTANT_InvokeDynamic: 552 case JVM_CONSTANT_Fieldref: 553 case JVM_CONSTANT_Methodref: 554 case JVM_CONSTANT_InterfaceMethodref: { 555 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 556 // already verified to be utf8 557 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 558 // already verified to be utf8 559 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 560 Symbol* name = cp->symbol_at(name_ref_index); 561 Symbol* signature = cp->symbol_at(signature_ref_index); 562 if (tag == JVM_CONSTANT_Fieldref) { 563 verify_legal_field_name(name, CHECK_(nullHandle)); 564 if (_need_verify && _major_version >= JAVA_7_VERSION) { 565 // Signature is verified above, when iterating NameAndType_info. 566 // Need only to be sure it's the right type. 567 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 568 throwIllegalSignature( 569 "Field", name, signature, CHECK_(nullHandle)); 570 } 571 } else { 572 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 573 } 574 } else { 575 verify_legal_method_name(name, CHECK_(nullHandle)); 576 if (_need_verify && _major_version >= JAVA_7_VERSION) { 577 // Signature is verified above, when iterating NameAndType_info. 578 // Need only to be sure it's the right type. 579 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 580 throwIllegalSignature( 581 "Method", name, signature, CHECK_(nullHandle)); 582 } 583 } else { 584 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 585 } 586 if (tag == JVM_CONSTANT_Methodref) { 587 // 4509014: If a class method name begins with '<', it must be "<init>". 588 assert(name != NULL, "method name in constant pool is null"); 589 unsigned int name_len = name->utf8_length(); 590 assert(name_len > 0, "bad method name"); // already verified as legal name 591 if (name->byte_at(0) == '<') { 592 if (name != vmSymbols::object_initializer_name()) { 593 classfile_parse_error( 594 "Bad method name at constant pool index %u in class file %s", 595 name_ref_index, CHECK_(nullHandle)); 596 } 597 } 598 } 599 } 600 break; 601 } 602 case JVM_CONSTANT_MethodHandle: { 603 int ref_index = cp->method_handle_index_at(index); 604 int ref_kind = cp->method_handle_ref_kind_at(index); 605 switch (ref_kind) { 606 case JVM_REF_invokeVirtual: 607 case JVM_REF_invokeStatic: 608 case JVM_REF_invokeSpecial: 609 case JVM_REF_newInvokeSpecial: 610 { 611 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index); 612 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 613 Symbol* name = cp->symbol_at(name_ref_index); 614 if (ref_kind == JVM_REF_newInvokeSpecial) { 615 if (name != vmSymbols::object_initializer_name()) { 616 classfile_parse_error( 617 "Bad constructor name at constant pool index %u in class file %s", 618 name_ref_index, CHECK_(nullHandle)); 619 } 620 } else { 621 if (name == vmSymbols::object_initializer_name()) { 622 classfile_parse_error( 623 "Bad method name at constant pool index %u in class file %s", 624 name_ref_index, CHECK_(nullHandle)); 625 } 626 } 627 } 628 break; 629 // Other ref_kinds are already fully checked in previous pass. 630 } 631 break; 632 } 633 case JVM_CONSTANT_MethodType: { 634 Symbol* no_name = vmSymbols::type_name(); // place holder 635 Symbol* signature = cp->method_type_signature_at(index); 636 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle)); 637 break; 638 } 639 case JVM_CONSTANT_Utf8: { 640 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 641 } 642 } // end of switch 643 } // end of for 644 645 return cp; 646} 647 648 649void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { 650 BasicType patch_type = T_VOID; 651 652 switch (cp->tag_at(index).value()) { 653 654 case JVM_CONSTANT_UnresolvedClass : 655 // Patching a class means pre-resolving it. 656 // The name in the constant pool is ignored. 657 if (java_lang_Class::is_instance(patch())) { 658 guarantee_property(!java_lang_Class::is_primitive(patch()), 659 "Illegal class patch at %d in class file %s", 660 index, CHECK); 661 cp->klass_at_put(index, java_lang_Class::as_Klass(patch())); 662 } else { 663 guarantee_property(java_lang_String::is_instance(patch()), 664 "Illegal class patch at %d in class file %s", 665 index, CHECK); 666 Symbol* name = java_lang_String::as_symbol(patch(), CHECK); 667 cp->unresolved_klass_at_put(index, name); 668 } 669 break; 670 671 case JVM_CONSTANT_String : 672 // skip this patch and don't clear it. Needs the oop array for resolved 673 // references to be created first. 674 return; 675 676 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; 677 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; 678 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; 679 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; 680 patch_prim: 681 { 682 jvalue value; 683 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 684 guarantee_property(value_type == patch_type, 685 "Illegal primitive patch at %d in class file %s", 686 index, CHECK); 687 switch (value_type) { 688 case T_INT: cp->int_at_put(index, value.i); break; 689 case T_FLOAT: cp->float_at_put(index, value.f); break; 690 case T_LONG: cp->long_at_put(index, value.j); break; 691 case T_DOUBLE: cp->double_at_put(index, value.d); break; 692 default: assert(false, ""); 693 } 694 } 695 break; 696 697 default: 698 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 699 guarantee_property(!has_cp_patch_at(index), 700 "Illegal unexpected patch at %d in class file %s", 701 index, CHECK); 702 return; 703 } 704 705 // On fall-through, mark the patch as used. 706 clear_cp_patch_at(index); 707} 708 709 710class NameSigHash: public ResourceObj { 711 public: 712 Symbol* _name; // name 713 Symbol* _sig; // signature 714 NameSigHash* _next; // Next entry in hash table 715}; 716 717 718#define HASH_ROW_SIZE 256 719 720unsigned int hash(Symbol* name, Symbol* sig) { 721 unsigned int raw_hash = 0; 722 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 723 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 724 725 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 726} 727 728 729void initialize_hashtable(NameSigHash** table) { 730 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 731} 732 733// Return false if the name/sig combination is found in table. 734// Return true if no duplicate is found. And name/sig is added as a new entry in table. 735// The old format checker uses heap sort to find duplicates. 736// NOTE: caller should guarantee that GC doesn't happen during the life cycle 737// of table since we don't expect Symbol*'s to move. 738bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) { 739 assert(name != NULL, "name in constant pool is NULL"); 740 741 // First lookup for duplicates 742 int index = hash(name, sig); 743 NameSigHash* entry = table[index]; 744 while (entry != NULL) { 745 if (entry->_name == name && entry->_sig == sig) { 746 return false; 747 } 748 entry = entry->_next; 749 } 750 751 // No duplicate is found, allocate a new entry and fill it. 752 entry = new NameSigHash(); 753 entry->_name = name; 754 entry->_sig = sig; 755 756 // Insert into hash table 757 entry->_next = table[index]; 758 table[index] = entry; 759 760 return true; 761} 762 763 764Array<Klass*>* ClassFileParser::parse_interfaces(int length, 765 Handle protection_domain, 766 Symbol* class_name, 767 bool* has_default_methods, 768 TRAPS) { 769 if (length == 0) { 770 _local_interfaces = Universe::the_empty_klass_array(); 771 } else { 772 ClassFileStream* cfs = stream(); 773 assert(length > 0, "only called for length>0"); 774 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL); 775 776 int index; 777 for (index = 0; index < length; index++) { 778 u2 interface_index = cfs->get_u2(CHECK_NULL); 779 KlassHandle interf; 780 check_property( 781 valid_klass_reference_at(interface_index), 782 "Interface name has bad constant pool index %u in class file %s", 783 interface_index, CHECK_NULL); 784 if (_cp->tag_at(interface_index).is_klass()) { 785 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index)); 786 } else { 787 Symbol* unresolved_klass = _cp->klass_name_at(interface_index); 788 789 // Don't need to check legal name because it's checked when parsing constant pool. 790 // But need to make sure it's not an array type. 791 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 792 "Bad interface name in class file %s", CHECK_NULL); 793 Handle class_loader(THREAD, _loader_data->class_loader()); 794 795 // Call resolve_super so classcircularity is checked 796 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, 797 unresolved_klass, class_loader, protection_domain, 798 false, CHECK_NULL); 799 interf = KlassHandle(THREAD, k); 800 } 801 802 if (!interf()->is_interface()) { 803 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL); 804 } 805 if (InstanceKlass::cast(interf())->has_default_methods()) { 806 *has_default_methods = true; 807 } 808 _local_interfaces->at_put(index, interf()); 809 } 810 811 if (!_need_verify || length <= 1) { 812 return _local_interfaces; 813 } 814 815 // Check if there's any duplicates in interfaces 816 ResourceMark rm(THREAD); 817 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 818 THREAD, NameSigHash*, HASH_ROW_SIZE); 819 initialize_hashtable(interface_names); 820 bool dup = false; 821 { 822 debug_only(No_Safepoint_Verifier nsv;) 823 for (index = 0; index < length; index++) { 824 Klass* k = _local_interfaces->at(index); 825 Symbol* name = InstanceKlass::cast(k)->name(); 826 // If no duplicates, add (name, NULL) in hashtable interface_names. 827 if (!put_after_lookup(name, NULL, interface_names)) { 828 dup = true; 829 break; 830 } 831 } 832 } 833 if (dup) { 834 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL); 835 } 836 } 837 return _local_interfaces; 838} 839 840 841void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) { 842 // Make sure the constant pool entry is of a type appropriate to this field 843 guarantee_property( 844 (constantvalue_index > 0 && 845 constantvalue_index < _cp->length()), 846 "Bad initial value index %u in ConstantValue attribute in class file %s", 847 constantvalue_index, CHECK); 848 constantTag value_type = _cp->tag_at(constantvalue_index); 849 switch ( _cp->basic_type_for_signature_at(signature_index) ) { 850 case T_LONG: 851 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 852 break; 853 case T_FLOAT: 854 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 855 break; 856 case T_DOUBLE: 857 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 858 break; 859 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 860 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 861 break; 862 case T_OBJECT: 863 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 864 && value_type.is_string()), 865 "Bad string initial value in class file %s", CHECK); 866 break; 867 default: 868 classfile_parse_error( 869 "Unable to set initial value %u in class file %s", 870 constantvalue_index, CHECK); 871 } 872} 873 874 875// Parse attributes for a field. 876void ClassFileParser::parse_field_attributes(u2 attributes_count, 877 bool is_static, u2 signature_index, 878 u2* constantvalue_index_addr, 879 bool* is_synthetic_addr, 880 u2* generic_signature_index_addr, 881 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 882 TRAPS) { 883 ClassFileStream* cfs = stream(); 884 assert(attributes_count > 0, "length should be greater than 0"); 885 u2 constantvalue_index = 0; 886 u2 generic_signature_index = 0; 887 bool is_synthetic = false; 888 u1* runtime_visible_annotations = NULL; 889 int runtime_visible_annotations_length = 0; 890 u1* runtime_invisible_annotations = NULL; 891 int runtime_invisible_annotations_length = 0; 892 u1* runtime_visible_type_annotations = NULL; 893 int runtime_visible_type_annotations_length = 0; 894 u1* runtime_invisible_type_annotations = NULL; 895 int runtime_invisible_type_annotations_length = 0; 896 bool runtime_invisible_annotations_exists = false; 897 bool runtime_invisible_type_annotations_exists = false; 898 while (attributes_count--) { 899 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 900 u2 attribute_name_index = cfs->get_u2_fast(); 901 u4 attribute_length = cfs->get_u4_fast(); 902 check_property(valid_symbol_at(attribute_name_index), 903 "Invalid field attribute index %u in class file %s", 904 attribute_name_index, 905 CHECK); 906 Symbol* attribute_name = _cp->symbol_at(attribute_name_index); 907 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 908 // ignore if non-static 909 if (constantvalue_index != 0) { 910 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 911 } 912 check_property( 913 attribute_length == 2, 914 "Invalid ConstantValue field attribute length %u in class file %s", 915 attribute_length, CHECK); 916 constantvalue_index = cfs->get_u2(CHECK); 917 if (_need_verify) { 918 verify_constantvalue(constantvalue_index, signature_index, CHECK); 919 } 920 } else if (attribute_name == vmSymbols::tag_synthetic()) { 921 if (attribute_length != 0) { 922 classfile_parse_error( 923 "Invalid Synthetic field attribute length %u in class file %s", 924 attribute_length, CHECK); 925 } 926 is_synthetic = true; 927 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 928 if (attribute_length != 0) { 929 classfile_parse_error( 930 "Invalid Deprecated field attribute length %u in class file %s", 931 attribute_length, CHECK); 932 } 933 } else if (_major_version >= JAVA_1_5_VERSION) { 934 if (attribute_name == vmSymbols::tag_signature()) { 935 if (attribute_length != 2) { 936 classfile_parse_error( 937 "Wrong size %u for field's Signature attribute in class file %s", 938 attribute_length, CHECK); 939 } 940 generic_signature_index = parse_generic_signature_attribute(CHECK); 941 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 942 if (runtime_visible_annotations != NULL) { 943 classfile_parse_error( 944 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 945 } 946 runtime_visible_annotations_length = attribute_length; 947 runtime_visible_annotations = cfs->get_u1_buffer(); 948 assert(runtime_visible_annotations != NULL, "null visible annotations"); 949 parse_annotations(runtime_visible_annotations, 950 runtime_visible_annotations_length, 951 parsed_annotations); 952 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 953 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 954 if (runtime_invisible_annotations_exists) { 955 classfile_parse_error( 956 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 957 } 958 runtime_invisible_annotations_exists = true; 959 if (PreserveAllAnnotations) { 960 runtime_invisible_annotations_length = attribute_length; 961 runtime_invisible_annotations = cfs->get_u1_buffer(); 962 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 963 } 964 cfs->skip_u1(attribute_length, CHECK); 965 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 966 if (runtime_visible_type_annotations != NULL) { 967 classfile_parse_error( 968 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 969 } 970 runtime_visible_type_annotations_length = attribute_length; 971 runtime_visible_type_annotations = cfs->get_u1_buffer(); 972 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 973 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 974 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 975 if (runtime_invisible_type_annotations_exists) { 976 classfile_parse_error( 977 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 978 } else { 979 runtime_invisible_type_annotations_exists = true; 980 } 981 if (PreserveAllAnnotations) { 982 runtime_invisible_type_annotations_length = attribute_length; 983 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 984 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 985 } 986 cfs->skip_u1(attribute_length, CHECK); 987 } else { 988 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 989 } 990 } else { 991 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 992 } 993 } 994 995 *constantvalue_index_addr = constantvalue_index; 996 *is_synthetic_addr = is_synthetic; 997 *generic_signature_index_addr = generic_signature_index; 998 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 999 runtime_visible_annotations_length, 1000 runtime_invisible_annotations, 1001 runtime_invisible_annotations_length, 1002 CHECK); 1003 parsed_annotations->set_field_annotations(a); 1004 a = assemble_annotations(runtime_visible_type_annotations, 1005 runtime_visible_type_annotations_length, 1006 runtime_invisible_type_annotations, 1007 runtime_invisible_type_annotations_length, 1008 CHECK); 1009 parsed_annotations->set_field_type_annotations(a); 1010 return; 1011} 1012 1013 1014// Field allocation types. Used for computing field offsets. 1015 1016enum FieldAllocationType { 1017 STATIC_OOP, // Oops 1018 STATIC_BYTE, // Boolean, Byte, char 1019 STATIC_SHORT, // shorts 1020 STATIC_WORD, // ints 1021 STATIC_DOUBLE, // aligned long or double 1022 NONSTATIC_OOP, 1023 NONSTATIC_BYTE, 1024 NONSTATIC_SHORT, 1025 NONSTATIC_WORD, 1026 NONSTATIC_DOUBLE, 1027 MAX_FIELD_ALLOCATION_TYPE, 1028 BAD_ALLOCATION_TYPE = -1 1029}; 1030 1031static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1032 BAD_ALLOCATION_TYPE, // 0 1033 BAD_ALLOCATION_TYPE, // 1 1034 BAD_ALLOCATION_TYPE, // 2 1035 BAD_ALLOCATION_TYPE, // 3 1036 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1037 NONSTATIC_SHORT, // T_CHAR = 5, 1038 NONSTATIC_WORD, // T_FLOAT = 6, 1039 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1040 NONSTATIC_BYTE, // T_BYTE = 8, 1041 NONSTATIC_SHORT, // T_SHORT = 9, 1042 NONSTATIC_WORD, // T_INT = 10, 1043 NONSTATIC_DOUBLE, // T_LONG = 11, 1044 NONSTATIC_OOP, // T_OBJECT = 12, 1045 NONSTATIC_OOP, // T_ARRAY = 13, 1046 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1047 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1048 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1049 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1050 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1051 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1052 BAD_ALLOCATION_TYPE, // 0 1053 BAD_ALLOCATION_TYPE, // 1 1054 BAD_ALLOCATION_TYPE, // 2 1055 BAD_ALLOCATION_TYPE, // 3 1056 STATIC_BYTE , // T_BOOLEAN = 4, 1057 STATIC_SHORT, // T_CHAR = 5, 1058 STATIC_WORD, // T_FLOAT = 6, 1059 STATIC_DOUBLE, // T_DOUBLE = 7, 1060 STATIC_BYTE, // T_BYTE = 8, 1061 STATIC_SHORT, // T_SHORT = 9, 1062 STATIC_WORD, // T_INT = 10, 1063 STATIC_DOUBLE, // T_LONG = 11, 1064 STATIC_OOP, // T_OBJECT = 12, 1065 STATIC_OOP, // T_ARRAY = 13, 1066 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1067 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1068 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1069 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1070 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1071 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1072}; 1073 1074static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1075 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1076 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1077 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1078 return result; 1079} 1080 1081class FieldAllocationCount: public ResourceObj { 1082 public: 1083 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1084 1085 FieldAllocationCount() { 1086 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1087 count[i] = 0; 1088 } 1089 } 1090 1091 FieldAllocationType update(bool is_static, BasicType type) { 1092 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1093 // Make sure there is no overflow with injected fields. 1094 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1095 count[atype]++; 1096 return atype; 1097 } 1098}; 1099 1100Array<u2>* ClassFileParser::parse_fields(Symbol* class_name, 1101 bool is_interface, 1102 FieldAllocationCount *fac, 1103 u2* java_fields_count_ptr, TRAPS) { 1104 ClassFileStream* cfs = stream(); 1105 cfs->guarantee_more(2, CHECK_NULL); // length 1106 u2 length = cfs->get_u2_fast(); 1107 *java_fields_count_ptr = length; 1108 1109 int num_injected = 0; 1110 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected); 1111 int total_fields = length + num_injected; 1112 1113 // The field array starts with tuples of shorts 1114 // [access, name index, sig index, initial value index, byte offset]. 1115 // A generic signature slot only exists for field with generic 1116 // signature attribute. And the access flag is set with 1117 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1118 // signature slots are at the end of the field array and after all 1119 // other fields data. 1120 // 1121 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1122 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1123 // ... 1124 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1125 // [generic signature index] 1126 // [generic signature index] 1127 // ... 1128 // 1129 // Allocate a temporary resource array for field data. For each field, 1130 // a slot is reserved in the temporary array for the generic signature 1131 // index. After parsing all fields, the data are copied to a permanent 1132 // array and any unused slots will be discarded. 1133 ResourceMark rm(THREAD); 1134 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD( 1135 THREAD, u2, total_fields * (FieldInfo::field_slots + 1)); 1136 1137 // The generic signature slots start after all other fields' data. 1138 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1139 int num_generic_signature = 0; 1140 for (int n = 0; n < length; n++) { 1141 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count 1142 1143 AccessFlags access_flags; 1144 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1145 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL); 1146 access_flags.set_flags(flags); 1147 1148 u2 name_index = cfs->get_u2_fast(); 1149 int cp_size = _cp->length(); 1150 check_property(valid_symbol_at(name_index), 1151 "Invalid constant pool index %u for field name in class file %s", 1152 name_index, 1153 CHECK_NULL); 1154 Symbol* name = _cp->symbol_at(name_index); 1155 verify_legal_field_name(name, CHECK_NULL); 1156 1157 u2 signature_index = cfs->get_u2_fast(); 1158 check_property(valid_symbol_at(signature_index), 1159 "Invalid constant pool index %u for field signature in class file %s", 1160 signature_index, CHECK_NULL); 1161 Symbol* sig = _cp->symbol_at(signature_index); 1162 verify_legal_field_signature(name, sig, CHECK_NULL); 1163 1164 u2 constantvalue_index = 0; 1165 bool is_synthetic = false; 1166 u2 generic_signature_index = 0; 1167 bool is_static = access_flags.is_static(); 1168 FieldAnnotationCollector parsed_annotations(_loader_data); 1169 1170 u2 attributes_count = cfs->get_u2_fast(); 1171 if (attributes_count > 0) { 1172 parse_field_attributes(attributes_count, is_static, signature_index, 1173 &constantvalue_index, &is_synthetic, 1174 &generic_signature_index, &parsed_annotations, 1175 CHECK_NULL); 1176 if (parsed_annotations.field_annotations() != NULL) { 1177 if (_fields_annotations == NULL) { 1178 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1179 _loader_data, length, NULL, 1180 CHECK_NULL); 1181 } 1182 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1183 parsed_annotations.set_field_annotations(NULL); 1184 } 1185 if (parsed_annotations.field_type_annotations() != NULL) { 1186 if (_fields_type_annotations == NULL) { 1187 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>( 1188 _loader_data, length, NULL, 1189 CHECK_NULL); 1190 } 1191 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1192 parsed_annotations.set_field_type_annotations(NULL); 1193 } 1194 1195 if (is_synthetic) { 1196 access_flags.set_is_synthetic(); 1197 } 1198 if (generic_signature_index != 0) { 1199 access_flags.set_field_has_generic_signature(); 1200 fa[generic_signature_slot] = generic_signature_index; 1201 generic_signature_slot ++; 1202 num_generic_signature ++; 1203 } 1204 } 1205 1206 FieldInfo* field = FieldInfo::from_field_array(fa, n); 1207 field->initialize(access_flags.as_short(), 1208 name_index, 1209 signature_index, 1210 constantvalue_index); 1211 BasicType type = _cp->basic_type_for_signature_at(signature_index); 1212 1213 // Remember how many oops we encountered and compute allocation type 1214 FieldAllocationType atype = fac->update(is_static, type); 1215 field->set_allocation_type(atype); 1216 1217 // After field is initialized with type, we can augment it with aux info 1218 if (parsed_annotations.has_any_annotations()) 1219 parsed_annotations.apply_to(field); 1220 } 1221 1222 int index = length; 1223 if (num_injected != 0) { 1224 for (int n = 0; n < num_injected; n++) { 1225 // Check for duplicates 1226 if (injected[n].may_be_java) { 1227 Symbol* name = injected[n].name(); 1228 Symbol* signature = injected[n].signature(); 1229 bool duplicate = false; 1230 for (int i = 0; i < length; i++) { 1231 FieldInfo* f = FieldInfo::from_field_array(fa, i); 1232 if (name == _cp->symbol_at(f->name_index()) && 1233 signature == _cp->symbol_at(f->signature_index())) { 1234 // Symbol is desclared in Java so skip this one 1235 duplicate = true; 1236 break; 1237 } 1238 } 1239 if (duplicate) { 1240 // These will be removed from the field array at the end 1241 continue; 1242 } 1243 } 1244 1245 // Injected field 1246 FieldInfo* field = FieldInfo::from_field_array(fa, index); 1247 field->initialize(JVM_ACC_FIELD_INTERNAL, 1248 injected[n].name_index, 1249 injected[n].signature_index, 1250 0); 1251 1252 BasicType type = FieldType::basic_type(injected[n].signature()); 1253 1254 // Remember how many oops we encountered and compute allocation type 1255 FieldAllocationType atype = fac->update(false, type); 1256 field->set_allocation_type(atype); 1257 index++; 1258 } 1259 } 1260 1261 // Now copy the fields' data from the temporary resource array. 1262 // Sometimes injected fields already exist in the Java source so 1263 // the fields array could be too long. In that case the 1264 // fields array is trimed. Also unused slots that were reserved 1265 // for generic signature indexes are discarded. 1266 Array<u2>* fields = MetadataFactory::new_array<u2>( 1267 _loader_data, index * FieldInfo::field_slots + num_generic_signature, 1268 CHECK_NULL); 1269 _fields = fields; // save in case of error 1270 { 1271 int i = 0; 1272 for (; i < index * FieldInfo::field_slots; i++) { 1273 fields->at_put(i, fa[i]); 1274 } 1275 for (int j = total_fields * FieldInfo::field_slots; 1276 j < generic_signature_slot; j++) { 1277 fields->at_put(i++, fa[j]); 1278 } 1279 assert(i == fields->length(), ""); 1280 } 1281 1282 if (_need_verify && length > 1) { 1283 // Check duplicated fields 1284 ResourceMark rm(THREAD); 1285 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1286 THREAD, NameSigHash*, HASH_ROW_SIZE); 1287 initialize_hashtable(names_and_sigs); 1288 bool dup = false; 1289 { 1290 debug_only(No_Safepoint_Verifier nsv;) 1291 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) { 1292 Symbol* name = fs.name(); 1293 Symbol* sig = fs.signature(); 1294 // If no duplicates, add name/signature in hashtable names_and_sigs. 1295 if (!put_after_lookup(name, sig, names_and_sigs)) { 1296 dup = true; 1297 break; 1298 } 1299 } 1300 } 1301 if (dup) { 1302 classfile_parse_error("Duplicate field name&signature in class file %s", 1303 CHECK_NULL); 1304 } 1305 } 1306 1307 return fields; 1308} 1309 1310 1311static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 1312 while (length-- > 0) { 1313 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 1314 } 1315} 1316 1317 1318u2* ClassFileParser::parse_exception_table(u4 code_length, 1319 u4 exception_table_length, 1320 TRAPS) { 1321 ClassFileStream* cfs = stream(); 1322 1323 u2* exception_table_start = cfs->get_u2_buffer(); 1324 assert(exception_table_start != NULL, "null exception table"); 1325 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index 1326 // Will check legal target after parsing code array in verifier. 1327 if (_need_verify) { 1328 for (unsigned int i = 0; i < exception_table_length; i++) { 1329 u2 start_pc = cfs->get_u2_fast(); 1330 u2 end_pc = cfs->get_u2_fast(); 1331 u2 handler_pc = cfs->get_u2_fast(); 1332 u2 catch_type_index = cfs->get_u2_fast(); 1333 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1334 "Illegal exception table range in class file %s", 1335 CHECK_NULL); 1336 guarantee_property(handler_pc < code_length, 1337 "Illegal exception table handler in class file %s", 1338 CHECK_NULL); 1339 if (catch_type_index != 0) { 1340 guarantee_property(valid_klass_reference_at(catch_type_index), 1341 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1342 } 1343 } 1344 } else { 1345 cfs->skip_u2_fast(exception_table_length * 4); 1346 } 1347 return exception_table_start; 1348} 1349 1350void ClassFileParser::parse_linenumber_table( 1351 u4 code_attribute_length, u4 code_length, 1352 CompressedLineNumberWriteStream** write_stream, TRAPS) { 1353 ClassFileStream* cfs = stream(); 1354 unsigned int num_entries = cfs->get_u2(CHECK); 1355 1356 // Each entry is a u2 start_pc, and a u2 line_number 1357 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 1358 1359 // Verify line number attribute and table length 1360 check_property( 1361 code_attribute_length == sizeof(u2) + length_in_bytes, 1362 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1363 1364 cfs->guarantee_more(length_in_bytes, CHECK); 1365 1366 if ((*write_stream) == NULL) { 1367 if (length_in_bytes > fixed_buffer_size) { 1368 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1369 } else { 1370 (*write_stream) = new CompressedLineNumberWriteStream( 1371 linenumbertable_buffer, fixed_buffer_size); 1372 } 1373 } 1374 1375 while (num_entries-- > 0) { 1376 u2 bci = cfs->get_u2_fast(); // start_pc 1377 u2 line = cfs->get_u2_fast(); // line_number 1378 guarantee_property(bci < code_length, 1379 "Invalid pc in LineNumberTable in class file %s", CHECK); 1380 (*write_stream)->write_pair(bci, line); 1381 } 1382} 1383 1384 1385class LVT_Hash : public AllStatic { 1386 public: 1387 1388 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1389 /* 1390 * 3-tuple start_bci/length/slot has to be unique key, 1391 * so the following comparison seems to be redundant: 1392 * && elem->name_cp_index == entry->_elem->name_cp_index 1393 */ 1394 return (e0.start_bci == e1.start_bci && 1395 e0.length == e1.length && 1396 e0.name_cp_index == e1.name_cp_index && 1397 e0.slot == e1.slot); 1398 } 1399 1400 static unsigned int hash(LocalVariableTableElement const& e0) { 1401 unsigned int raw_hash = e0.start_bci; 1402 1403 raw_hash = e0.length + raw_hash * 37; 1404 raw_hash = e0.name_cp_index + raw_hash * 37; 1405 raw_hash = e0.slot + raw_hash * 37; 1406 1407 return raw_hash; 1408 } 1409}; 1410 1411 1412// Class file LocalVariableTable elements. 1413class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1414 public: 1415 u2 start_bci; 1416 u2 length; 1417 u2 name_cp_index; 1418 u2 descriptor_cp_index; 1419 u2 slot; 1420}; 1421 1422void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1423 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1424 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1425 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1426 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1427 lvt->signature_cp_index = 0; 1428 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1429} 1430 1431// Function is used to parse both attributes: 1432// LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1433u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1434 u2 max_locals, 1435 u4 code_attribute_length, 1436 u2* localvariable_table_length, 1437 bool isLVTT, 1438 TRAPS) { 1439 ClassFileStream* cfs = stream(); 1440 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1441 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1442 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1443 // Verify local variable table attribute has right length 1444 if (_need_verify) { 1445 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1446 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1447 } 1448 u2* localvariable_table_start = cfs->get_u2_buffer(); 1449 assert(localvariable_table_start != NULL, "null local variable table"); 1450 if (!_need_verify) { 1451 cfs->skip_u2_fast(size); 1452 } else { 1453 cfs->guarantee_more(size * 2, CHECK_NULL); 1454 for(int i = 0; i < (*localvariable_table_length); i++) { 1455 u2 start_pc = cfs->get_u2_fast(); 1456 u2 length = cfs->get_u2_fast(); 1457 u2 name_index = cfs->get_u2_fast(); 1458 u2 descriptor_index = cfs->get_u2_fast(); 1459 u2 index = cfs->get_u2_fast(); 1460 // Assign to a u4 to avoid overflow 1461 u4 end_pc = (u4)start_pc + (u4)length; 1462 1463 if (start_pc >= code_length) { 1464 classfile_parse_error( 1465 "Invalid start_pc %u in %s in class file %s", 1466 start_pc, tbl_name, CHECK_NULL); 1467 } 1468 if (end_pc > code_length) { 1469 classfile_parse_error( 1470 "Invalid length %u in %s in class file %s", 1471 length, tbl_name, CHECK_NULL); 1472 } 1473 int cp_size = _cp->length(); 1474 guarantee_property(valid_symbol_at(name_index), 1475 "Name index %u in %s has bad constant type in class file %s", 1476 name_index, tbl_name, CHECK_NULL); 1477 guarantee_property(valid_symbol_at(descriptor_index), 1478 "Signature index %u in %s has bad constant type in class file %s", 1479 descriptor_index, tbl_name, CHECK_NULL); 1480 1481 Symbol* name = _cp->symbol_at(name_index); 1482 Symbol* sig = _cp->symbol_at(descriptor_index); 1483 verify_legal_field_name(name, CHECK_NULL); 1484 u2 extra_slot = 0; 1485 if (!isLVTT) { 1486 verify_legal_field_signature(name, sig, CHECK_NULL); 1487 1488 // 4894874: check special cases for double and long local variables 1489 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1490 sig == vmSymbols::type_signature(T_LONG)) { 1491 extra_slot = 1; 1492 } 1493 } 1494 guarantee_property((index + extra_slot) < max_locals, 1495 "Invalid index %u in %s in class file %s", 1496 index, tbl_name, CHECK_NULL); 1497 } 1498 } 1499 return localvariable_table_start; 1500} 1501 1502 1503void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1504 u1* u1_array, u2* u2_array, TRAPS) { 1505 ClassFileStream* cfs = stream(); 1506 u2 index = 0; // index in the array with long/double occupying two slots 1507 u4 i1 = *u1_index; 1508 u4 i2 = *u2_index + 1; 1509 for(int i = 0; i < array_length; i++) { 1510 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1511 index++; 1512 if (tag == ITEM_Long || tag == ITEM_Double) { 1513 index++; 1514 } else if (tag == ITEM_Object) { 1515 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1516 guarantee_property(valid_klass_reference_at(class_index), 1517 "Bad class index %u in StackMap in class file %s", 1518 class_index, CHECK); 1519 } else if (tag == ITEM_Uninitialized) { 1520 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1521 guarantee_property( 1522 offset < code_length, 1523 "Bad uninitialized type offset %u in StackMap in class file %s", 1524 offset, CHECK); 1525 } else { 1526 guarantee_property( 1527 tag <= (u1)ITEM_Uninitialized, 1528 "Unknown variable type %u in StackMap in class file %s", 1529 tag, CHECK); 1530 } 1531 } 1532 u2_array[*u2_index] = index; 1533 *u1_index = i1; 1534 *u2_index = i2; 1535} 1536 1537u1* ClassFileParser::parse_stackmap_table( 1538 u4 code_attribute_length, TRAPS) { 1539 if (code_attribute_length == 0) 1540 return NULL; 1541 1542 ClassFileStream* cfs = stream(); 1543 u1* stackmap_table_start = cfs->get_u1_buffer(); 1544 assert(stackmap_table_start != NULL, "null stackmap table"); 1545 1546 // check code_attribute_length first 1547 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1548 1549 if (!_need_verify && !DumpSharedSpaces) { 1550 return NULL; 1551 } 1552 return stackmap_table_start; 1553} 1554 1555u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1556 u4 method_attribute_length, 1557 TRAPS) { 1558 ClassFileStream* cfs = stream(); 1559 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1560 *checked_exceptions_length = cfs->get_u2_fast(); 1561 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1562 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1563 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1564 if (!_need_verify) { 1565 cfs->skip_u2_fast(size); 1566 } else { 1567 // Verify each value in the checked exception table 1568 u2 checked_exception; 1569 u2 len = *checked_exceptions_length; 1570 cfs->guarantee_more(2 * len, CHECK_NULL); 1571 for (int i = 0; i < len; i++) { 1572 checked_exception = cfs->get_u2_fast(); 1573 check_property( 1574 valid_klass_reference_at(checked_exception), 1575 "Exception name has bad type at constant pool %u in class file %s", 1576 checked_exception, CHECK_NULL); 1577 } 1578 } 1579 // check exceptions attribute length 1580 if (_need_verify) { 1581 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1582 sizeof(u2) * size), 1583 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1584 } 1585 return checked_exceptions_start; 1586} 1587 1588void ClassFileParser::throwIllegalSignature( 1589 const char* type, Symbol* name, Symbol* sig, TRAPS) { 1590 ResourceMark rm(THREAD); 1591 Exceptions::fthrow(THREAD_AND_LOCATION, 1592 vmSymbols::java_lang_ClassFormatError(), 1593 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1594 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1595} 1596 1597// Skip an annotation. Return >=limit if there is any problem. 1598int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) { 1599 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1600 // value := switch (tag:u1) { ... } 1601 index += 2; // skip atype 1602 if ((index += 2) >= limit) return limit; // read nmem 1603 int nmem = Bytes::get_Java_u2(buffer+index-2); 1604 while (--nmem >= 0 && index < limit) { 1605 index += 2; // skip member 1606 index = skip_annotation_value(buffer, limit, index); 1607 } 1608 return index; 1609} 1610 1611// Skip an annotation value. Return >=limit if there is any problem. 1612int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) { 1613 // value := switch (tag:u1) { 1614 // case B, C, I, S, Z, D, F, J, c: con:u2; 1615 // case e: e_class:u2 e_name:u2; 1616 // case s: s_con:u2; 1617 // case [: do(nval:u2) {value}; 1618 // case @: annotation; 1619 // case s: s_con:u2; 1620 // } 1621 if ((index += 1) >= limit) return limit; // read tag 1622 u1 tag = buffer[index-1]; 1623 switch (tag) { 1624 case 'B': case 'C': case 'I': case 'S': case 'Z': 1625 case 'D': case 'F': case 'J': case 'c': case 's': 1626 index += 2; // skip con or s_con 1627 break; 1628 case 'e': 1629 index += 4; // skip e_class, e_name 1630 break; 1631 case '[': 1632 { 1633 if ((index += 2) >= limit) return limit; // read nval 1634 int nval = Bytes::get_Java_u2(buffer+index-2); 1635 while (--nval >= 0 && index < limit) { 1636 index = skip_annotation_value(buffer, limit, index); 1637 } 1638 } 1639 break; 1640 case '@': 1641 index = skip_annotation(buffer, limit, index); 1642 break; 1643 default: 1644 return limit; // bad tag byte 1645 } 1646 return index; 1647} 1648 1649// Sift through annotations, looking for those significant to the VM: 1650void ClassFileParser::parse_annotations(u1* buffer, int limit, 1651 ClassFileParser::AnnotationCollector* coll) { 1652 // annotations := do(nann:u2) {annotation} 1653 int index = 0; 1654 if ((index += 2) >= limit) return; // read nann 1655 int nann = Bytes::get_Java_u2(buffer+index-2); 1656 enum { // initial annotation layout 1657 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1658 count_off = 2, // u2 such as 1 (one value) 1659 member_off = 4, // utf8 such as 'value' 1660 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1661 e_tag_val = 'e', 1662 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1663 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1664 e_size = 11, // end of 'e' annotation 1665 c_tag_val = 'c', // payload is type 1666 c_con_off = 7, // utf8 payload, such as 'I' 1667 c_size = 9, // end of 'c' annotation 1668 s_tag_val = 's', // payload is String 1669 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1670 s_size = 9, 1671 min_size = 6 // smallest possible size (zero members) 1672 }; 1673 while ((--nann) >= 0 && (index-2 + min_size <= limit)) { 1674 int index0 = index; 1675 index = skip_annotation(buffer, limit, index); 1676 u1* abase = buffer + index0; 1677 int atype = Bytes::get_Java_u2(abase + atype_off); 1678 int count = Bytes::get_Java_u2(abase + count_off); 1679 Symbol* aname = check_symbol_at(_cp, atype); 1680 if (aname == NULL) break; // invalid annotation name 1681 Symbol* member = NULL; 1682 if (count >= 1) { 1683 int member_index = Bytes::get_Java_u2(abase + member_off); 1684 member = check_symbol_at(_cp, member_index); 1685 if (member == NULL) break; // invalid member name 1686 } 1687 1688 // Here is where parsing particular annotations will take place. 1689 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname); 1690 if (id == AnnotationCollector::_unknown) continue; 1691 coll->set_annotation(id); 1692 1693 if (id == AnnotationCollector::_sun_misc_Contended) { 1694 // @Contended can optionally specify the contention group. 1695 // 1696 // Contended group defines the equivalence class over the fields: 1697 // the fields within the same contended group are not treated distinct. 1698 // The only exception is default group, which does not incur the 1699 // equivalence. Naturally, contention group for classes is meaningless. 1700 // 1701 // While the contention group is specified as String, annotation 1702 // values are already interned, and we might as well use the constant 1703 // pool index as the group tag. 1704 // 1705 u2 group_index = 0; // default contended group 1706 if (count == 1 1707 && s_size == (index - index0) // match size 1708 && s_tag_val == *(abase + tag_off) 1709 && member == vmSymbols::value_name()) { 1710 group_index = Bytes::get_Java_u2(abase + s_con_off); 1711 if (_cp->symbol_at(group_index)->utf8_length() == 0) { 1712 group_index = 0; // default contended group 1713 } 1714 } 1715 coll->set_contended_group(group_index); 1716 } 1717 } 1718} 1719 1720ClassFileParser::AnnotationCollector::ID 1721ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data, 1722 Symbol* name) { 1723 vmSymbols::SID sid = vmSymbols::find_sid(name); 1724 // Privileged code can use all annotations. Other code silently drops some. 1725 const bool privileged = loader_data->is_the_null_class_loader_data() || 1726 loader_data->is_ext_class_loader_data() || 1727 loader_data->is_anonymous(); 1728 switch (sid) { 1729 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature): 1730 if (_location != _in_method) break; // only allow for methods 1731 if (!privileged) break; // only allow in privileged code 1732 return _method_CallerSensitive; 1733 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature): 1734 if (_location != _in_method) break; // only allow for methods 1735 if (!privileged) break; // only allow in privileged code 1736 return _method_ForceInline; 1737 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature): 1738 if (_location != _in_method) break; // only allow for methods 1739 if (!privileged) break; // only allow in privileged code 1740 return _method_DontInline; 1741 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): 1742 if (_location != _in_method) break; // only allow for methods 1743 if (!privileged) break; // only allow in privileged code 1744 return _method_InjectedProfile; 1745 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): 1746 if (_location != _in_method) break; // only allow for methods 1747 if (!privileged) break; // only allow in privileged code 1748 return _method_LambdaForm_Compiled; 1749 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): 1750 if (_location != _in_method) break; // only allow for methods 1751 if (!privileged) break; // only allow in privileged code 1752 return _method_LambdaForm_Hidden; 1753 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): 1754 if (_location != _in_method) break; // only allow for methods 1755 if (!privileged) break; // only allow in privileged code 1756 return _method_HotSpotIntrinsicCandidate; 1757#if INCLUDE_JVMCI 1758 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_vm_ci_hotspot_Stable_signature): 1759 if (_location != _in_field) break; // only allow for fields 1760 if (!privileged) break; // only allow in privileged code 1761 return _field_Stable; 1762#endif 1763 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature): 1764 if (_location != _in_field) break; // only allow for fields 1765 if (!privileged) break; // only allow in privileged code 1766 return _field_Stable; 1767 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature): 1768 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes 1769 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges 1770 return _sun_misc_Contended; 1771 default: break; 1772 } 1773 return AnnotationCollector::_unknown; 1774} 1775 1776void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 1777 if (is_contended()) 1778 f->set_contended_group(contended_group()); 1779 if (is_stable()) 1780 f->set_stable(true); 1781} 1782 1783ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 1784 // If there's an error deallocate metadata for field annotations 1785 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 1786 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 1787} 1788 1789void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) { 1790 if (has_annotation(_method_CallerSensitive)) 1791 m->set_caller_sensitive(true); 1792 if (has_annotation(_method_ForceInline)) 1793 m->set_force_inline(true); 1794 if (has_annotation(_method_DontInline)) 1795 m->set_dont_inline(true); 1796 if (has_annotation(_method_InjectedProfile)) 1797 m->set_has_injected_profile(true); 1798 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 1799 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 1800 if (has_annotation(_method_LambdaForm_Hidden)) 1801 m->set_hidden(true); 1802 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic()) 1803 m->set_intrinsic_candidate(true); 1804} 1805 1806void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) { 1807 k->set_is_contended(is_contended()); 1808} 1809 1810 1811#define MAX_ARGS_SIZE 255 1812#define MAX_CODE_SIZE 65535 1813#define INITIAL_MAX_LVT_NUMBER 256 1814 1815/* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1816 * 1817 * Rules for LVT's and LVTT's are: 1818 * - There can be any number of LVT's and LVTT's. 1819 * - If there are n LVT's, it is the same as if there was just 1820 * one LVT containing all the entries from the n LVT's. 1821 * - There may be no more than one LVT entry per local variable. 1822 * Two LVT entries are 'equal' if these fields are the same: 1823 * start_pc, length, name, slot 1824 * - There may be no more than one LVTT entry per each LVT entry. 1825 * Each LVTT entry has to match some LVT entry. 1826 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1827 */ 1828void ClassFileParser::copy_localvariable_table(ConstMethod* cm, 1829 int lvt_cnt, 1830 u2* localvariable_table_length, 1831 u2** localvariable_table_start, 1832 int lvtt_cnt, 1833 u2* localvariable_type_table_length, 1834 u2** localvariable_type_table_start, 1835 TRAPS) { 1836 1837 ResourceMark rm(THREAD); 1838 1839 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*, 1840 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 1841 1842 LVT_HashTable* table = new LVT_HashTable(); 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. 1853 if (table->put(*lvt, lvt) == false 1854 && _need_verify 1855 && _major_version >= JAVA_1_5_VERSION) { 1856 classfile_parse_error("Duplicated LocalVariableTable attribute " 1857 "entry for '%s' in class file %s", 1858 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 1859 CHECK); 1860 } 1861 } 1862 } 1863 1864 // To merge LocalVariableTable and LocalVariableTypeTable 1865 Classfile_LVT_Element* cf_lvtt; 1866 LocalVariableTableElement lvtt_elem; 1867 1868 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 1869 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 1870 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 1871 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 1872 LocalVariableTableElement** entry = table->get(lvtt_elem); 1873 if (entry == NULL) { 1874 if (_need_verify) { 1875 classfile_parse_error("LVTT entry for '%s' in class file %s " 1876 "does not match any LVT entry", 1877 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1878 CHECK); 1879 } 1880 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 1881 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1882 "entry for '%s' in class file %s", 1883 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1884 CHECK); 1885 } else { 1886 // to add generic signatures into LocalVariableTable 1887 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 1888 } 1889 } 1890 } 1891} 1892 1893 1894void ClassFileParser::copy_method_annotations(ConstMethod* cm, 1895 u1* runtime_visible_annotations, 1896 int runtime_visible_annotations_length, 1897 u1* runtime_invisible_annotations, 1898 int runtime_invisible_annotations_length, 1899 u1* runtime_visible_parameter_annotations, 1900 int runtime_visible_parameter_annotations_length, 1901 u1* runtime_invisible_parameter_annotations, 1902 int runtime_invisible_parameter_annotations_length, 1903 u1* runtime_visible_type_annotations, 1904 int runtime_visible_type_annotations_length, 1905 u1* runtime_invisible_type_annotations, 1906 int runtime_invisible_type_annotations_length, 1907 u1* annotation_default, 1908 int annotation_default_length, 1909 TRAPS) { 1910 1911 AnnotationArray* a; 1912 1913 if (runtime_visible_annotations_length + 1914 runtime_invisible_annotations_length > 0) { 1915 a = assemble_annotations(runtime_visible_annotations, 1916 runtime_visible_annotations_length, 1917 runtime_invisible_annotations, 1918 runtime_invisible_annotations_length, 1919 CHECK); 1920 cm->set_method_annotations(a); 1921 } 1922 1923 if (runtime_visible_parameter_annotations_length + 1924 runtime_invisible_parameter_annotations_length > 0) { 1925 a = assemble_annotations(runtime_visible_parameter_annotations, 1926 runtime_visible_parameter_annotations_length, 1927 runtime_invisible_parameter_annotations, 1928 runtime_invisible_parameter_annotations_length, 1929 CHECK); 1930 cm->set_parameter_annotations(a); 1931 } 1932 1933 if (annotation_default_length > 0) { 1934 a = assemble_annotations(annotation_default, 1935 annotation_default_length, 1936 NULL, 1937 0, 1938 CHECK); 1939 cm->set_default_annotations(a); 1940 } 1941 1942 if (runtime_visible_type_annotations_length + 1943 runtime_invisible_type_annotations_length > 0) { 1944 a = assemble_annotations(runtime_visible_type_annotations, 1945 runtime_visible_type_annotations_length, 1946 runtime_invisible_type_annotations, 1947 runtime_invisible_type_annotations_length, 1948 CHECK); 1949 cm->set_type_annotations(a); 1950 } 1951} 1952 1953 1954// Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1955// attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 1956// Method* to save footprint, so we only know the size of the resulting Method* when the 1957// entire method attribute is parsed. 1958// 1959// The promoted_flags parameter is used to pass relevant access_flags 1960// from the method back up to the containing klass. These flag values 1961// are added to klass's access_flags. 1962 1963methodHandle ClassFileParser::parse_method(bool is_interface, 1964 AccessFlags *promoted_flags, 1965 TRAPS) { 1966 ClassFileStream* cfs = stream(); 1967 methodHandle nullHandle; 1968 ResourceMark rm(THREAD); 1969 // Parse fixed parts 1970 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1971 1972 int flags = cfs->get_u2_fast(); 1973 u2 name_index = cfs->get_u2_fast(); 1974 int cp_size = _cp->length(); 1975 check_property( 1976 valid_symbol_at(name_index), 1977 "Illegal constant pool index %u for method name in class file %s", 1978 name_index, CHECK_(nullHandle)); 1979 Symbol* name = _cp->symbol_at(name_index); 1980 verify_legal_method_name(name, CHECK_(nullHandle)); 1981 1982 u2 signature_index = cfs->get_u2_fast(); 1983 guarantee_property( 1984 valid_symbol_at(signature_index), 1985 "Illegal constant pool index %u for method signature in class file %s", 1986 signature_index, CHECK_(nullHandle)); 1987 Symbol* signature = _cp->symbol_at(signature_index); 1988 1989 AccessFlags access_flags; 1990 if (name == vmSymbols::class_initializer_name()) { 1991 // We ignore the other access flags for a valid class initializer. 1992 // (JVM Spec 2nd ed., chapter 4.6) 1993 if (_major_version < 51) { // backward compatibility 1994 flags = JVM_ACC_STATIC; 1995 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 1996 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 1997 } else { 1998 // As of major_version 51, a method named <clinit> without ACC_STATIC is 1999 // just another method. So, do a normal method modifer check. 2000 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 2001 } 2002 } else { 2003 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 2004 } 2005 2006 int args_size = -1; // only used when _need_verify is true 2007 if (_need_verify) { 2008 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2009 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 2010 if (args_size > MAX_ARGS_SIZE) { 2011 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 2012 } 2013 } 2014 2015 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2016 2017 // Default values for code and exceptions attribute elements 2018 u2 max_stack = 0; 2019 u2 max_locals = 0; 2020 u4 code_length = 0; 2021 u1* code_start = 0; 2022 u2 exception_table_length = 0; 2023 u2* exception_table_start = NULL; 2024 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2025 u2 checked_exceptions_length = 0; 2026 u2* checked_exceptions_start = NULL; 2027 CompressedLineNumberWriteStream* linenumber_table = NULL; 2028 int linenumber_table_length = 0; 2029 int total_lvt_length = 0; 2030 u2 lvt_cnt = 0; 2031 u2 lvtt_cnt = 0; 2032 bool lvt_allocated = false; 2033 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2034 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2035 u2* localvariable_table_length = NULL; 2036 u2** localvariable_table_start = NULL; 2037 u2* localvariable_type_table_length = NULL; 2038 u2** localvariable_type_table_start = NULL; 2039 int method_parameters_length = -1; 2040 u1* method_parameters_data = NULL; 2041 bool method_parameters_seen = false; 2042 bool parsed_code_attribute = false; 2043 bool parsed_checked_exceptions_attribute = false; 2044 bool parsed_stackmap_attribute = false; 2045 // stackmap attribute - JDK1.5 2046 u1* stackmap_data = NULL; 2047 int stackmap_data_length = 0; 2048 u2 generic_signature_index = 0; 2049 MethodAnnotationCollector parsed_annotations; 2050 u1* runtime_visible_annotations = NULL; 2051 int runtime_visible_annotations_length = 0; 2052 u1* runtime_invisible_annotations = NULL; 2053 int runtime_invisible_annotations_length = 0; 2054 u1* runtime_visible_parameter_annotations = NULL; 2055 int runtime_visible_parameter_annotations_length = 0; 2056 u1* runtime_invisible_parameter_annotations = NULL; 2057 int runtime_invisible_parameter_annotations_length = 0; 2058 u1* runtime_visible_type_annotations = NULL; 2059 int runtime_visible_type_annotations_length = 0; 2060 u1* runtime_invisible_type_annotations = NULL; 2061 int runtime_invisible_type_annotations_length = 0; 2062 bool runtime_invisible_annotations_exists = false; 2063 bool runtime_invisible_type_annotations_exists = false; 2064 bool runtime_invisible_parameter_annotations_exists = false; 2065 u1* annotation_default = NULL; 2066 int annotation_default_length = 0; 2067 2068 // Parse code and exceptions attribute 2069 u2 method_attributes_count = cfs->get_u2_fast(); 2070 while (method_attributes_count--) { 2071 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 2072 u2 method_attribute_name_index = cfs->get_u2_fast(); 2073 u4 method_attribute_length = cfs->get_u4_fast(); 2074 check_property( 2075 valid_symbol_at(method_attribute_name_index), 2076 "Invalid method attribute name index %u in class file %s", 2077 method_attribute_name_index, CHECK_(nullHandle)); 2078 2079 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index); 2080 if (method_attribute_name == vmSymbols::tag_code()) { 2081 // Parse Code attribute 2082 if (_need_verify) { 2083 guarantee_property( 2084 !access_flags.is_native() && !access_flags.is_abstract(), 2085 "Code attribute in native or abstract methods in class file %s", 2086 CHECK_(nullHandle)); 2087 } 2088 if (parsed_code_attribute) { 2089 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 2090 } 2091 parsed_code_attribute = true; 2092 2093 // Stack size, locals size, and code size 2094 if (_major_version == 45 && _minor_version <= 2) { 2095 cfs->guarantee_more(4, CHECK_(nullHandle)); 2096 max_stack = cfs->get_u1_fast(); 2097 max_locals = cfs->get_u1_fast(); 2098 code_length = cfs->get_u2_fast(); 2099 } else { 2100 cfs->guarantee_more(8, CHECK_(nullHandle)); 2101 max_stack = cfs->get_u2_fast(); 2102 max_locals = cfs->get_u2_fast(); 2103 code_length = cfs->get_u4_fast(); 2104 } 2105 if (_need_verify) { 2106 guarantee_property(args_size <= max_locals, 2107 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 2108 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2109 "Invalid method Code length %u in class file %s", 2110 code_length, CHECK_(nullHandle)); 2111 } 2112 // Code pointer 2113 code_start = cfs->get_u1_buffer(); 2114 assert(code_start != NULL, "null code start"); 2115 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 2116 cfs->skip_u1_fast(code_length); 2117 2118 // Exception handler table 2119 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 2120 exception_table_length = cfs->get_u2_fast(); 2121 if (exception_table_length > 0) { 2122 exception_table_start = 2123 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle)); 2124 } 2125 2126 // Parse additional attributes in code attribute 2127 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 2128 u2 code_attributes_count = cfs->get_u2_fast(); 2129 2130 unsigned int calculated_attribute_length = 0; 2131 2132 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2133 calculated_attribute_length = 2134 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2135 } else { 2136 // max_stack, locals and length are smaller in pre-version 45.2 classes 2137 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2138 } 2139 calculated_attribute_length += 2140 code_length + 2141 sizeof(exception_table_length) + 2142 sizeof(code_attributes_count) + 2143 exception_table_length * 2144 ( sizeof(u2) + // start_pc 2145 sizeof(u2) + // end_pc 2146 sizeof(u2) + // handler_pc 2147 sizeof(u2) ); // catch_type_index 2148 2149 while (code_attributes_count--) { 2150 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 2151 u2 code_attribute_name_index = cfs->get_u2_fast(); 2152 u4 code_attribute_length = cfs->get_u4_fast(); 2153 calculated_attribute_length += code_attribute_length + 2154 sizeof(code_attribute_name_index) + 2155 sizeof(code_attribute_length); 2156 check_property(valid_symbol_at(code_attribute_name_index), 2157 "Invalid code attribute name index %u in class file %s", 2158 code_attribute_name_index, 2159 CHECK_(nullHandle)); 2160 if (LoadLineNumberTables && 2161 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2162 // Parse and compress line number table 2163 parse_linenumber_table(code_attribute_length, code_length, 2164 &linenumber_table, CHECK_(nullHandle)); 2165 2166 } else if (LoadLocalVariableTables && 2167 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2168 // Parse local variable table 2169 if (!lvt_allocated) { 2170 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2171 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2172 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2173 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2174 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2175 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2176 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2177 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2178 lvt_allocated = true; 2179 } 2180 if (lvt_cnt == max_lvt_cnt) { 2181 max_lvt_cnt <<= 1; 2182 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2183 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2184 } 2185 localvariable_table_start[lvt_cnt] = 2186 parse_localvariable_table(code_length, 2187 max_locals, 2188 code_attribute_length, 2189 &localvariable_table_length[lvt_cnt], 2190 false, // is not LVTT 2191 CHECK_(nullHandle)); 2192 total_lvt_length += localvariable_table_length[lvt_cnt]; 2193 lvt_cnt++; 2194 } else if (LoadLocalVariableTypeTables && 2195 _major_version >= JAVA_1_5_VERSION && 2196 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2197 if (!lvt_allocated) { 2198 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2199 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2200 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2201 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2202 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2203 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2204 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2205 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2206 lvt_allocated = true; 2207 } 2208 // Parse local variable type table 2209 if (lvtt_cnt == max_lvtt_cnt) { 2210 max_lvtt_cnt <<= 1; 2211 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2212 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2213 } 2214 localvariable_type_table_start[lvtt_cnt] = 2215 parse_localvariable_table(code_length, 2216 max_locals, 2217 code_attribute_length, 2218 &localvariable_type_table_length[lvtt_cnt], 2219 true, // is LVTT 2220 CHECK_(nullHandle)); 2221 lvtt_cnt++; 2222 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2223 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2224 // Stack map is only needed by the new verifier in JDK1.5. 2225 if (parsed_stackmap_attribute) { 2226 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 2227 } 2228 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 2229 stackmap_data_length = code_attribute_length; 2230 parsed_stackmap_attribute = true; 2231 } else { 2232 // Skip unknown attributes 2233 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 2234 } 2235 } 2236 // check method attribute length 2237 if (_need_verify) { 2238 guarantee_property(method_attribute_length == calculated_attribute_length, 2239 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 2240 } 2241 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2242 // Parse Exceptions attribute 2243 if (parsed_checked_exceptions_attribute) { 2244 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 2245 } 2246 parsed_checked_exceptions_attribute = true; 2247 checked_exceptions_start = 2248 parse_checked_exceptions(&checked_exceptions_length, 2249 method_attribute_length, 2250 CHECK_(nullHandle)); 2251 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2252 // reject multiple method parameters 2253 if (method_parameters_seen) { 2254 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle)); 2255 } 2256 method_parameters_seen = true; 2257 method_parameters_length = cfs->get_u1_fast(); 2258 const u2 real_length = (method_parameters_length * 4u) + 1u; 2259 if (method_attribute_length != real_length) { 2260 classfile_parse_error( 2261 "Invalid MethodParameters method attribute length %u in class file", 2262 method_attribute_length, CHECK_(nullHandle)); 2263 } 2264 method_parameters_data = cfs->get_u1_buffer(); 2265 cfs->skip_u2_fast(method_parameters_length); 2266 cfs->skip_u2_fast(method_parameters_length); 2267 // ignore this attribute if it cannot be reflected 2268 if (!SystemDictionary::Parameter_klass_loaded()) 2269 method_parameters_length = -1; 2270 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2271 if (method_attribute_length != 0) { 2272 classfile_parse_error( 2273 "Invalid Synthetic method attribute length %u in class file %s", 2274 method_attribute_length, CHECK_(nullHandle)); 2275 } 2276 // Should we check that there hasn't already been a synthetic attribute? 2277 access_flags.set_is_synthetic(); 2278 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2279 if (method_attribute_length != 0) { 2280 classfile_parse_error( 2281 "Invalid Deprecated method attribute length %u in class file %s", 2282 method_attribute_length, CHECK_(nullHandle)); 2283 } 2284 } else if (_major_version >= JAVA_1_5_VERSION) { 2285 if (method_attribute_name == vmSymbols::tag_signature()) { 2286 if (method_attribute_length != 2) { 2287 classfile_parse_error( 2288 "Invalid Signature attribute length %u in class file %s", 2289 method_attribute_length, CHECK_(nullHandle)); 2290 } 2291 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle)); 2292 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2293 if (runtime_visible_annotations != NULL) { 2294 classfile_parse_error( 2295 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2296 } 2297 runtime_visible_annotations_length = method_attribute_length; 2298 runtime_visible_annotations = cfs->get_u1_buffer(); 2299 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2300 parse_annotations(runtime_visible_annotations, 2301 runtime_visible_annotations_length, &parsed_annotations); 2302 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 2303 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2304 if (runtime_invisible_annotations_exists) { 2305 classfile_parse_error( 2306 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2307 } 2308 runtime_invisible_annotations_exists = true; 2309 if (PreserveAllAnnotations) { 2310 runtime_invisible_annotations_length = method_attribute_length; 2311 runtime_invisible_annotations = cfs->get_u1_buffer(); 2312 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2313 } 2314 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2315 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2316 if (runtime_visible_parameter_annotations != NULL) { 2317 classfile_parse_error( 2318 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2319 } 2320 runtime_visible_parameter_annotations_length = method_attribute_length; 2321 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 2322 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2323 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 2324 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2325 if (runtime_invisible_parameter_annotations_exists) { 2326 classfile_parse_error( 2327 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2328 } 2329 runtime_invisible_parameter_annotations_exists = true; 2330 if (PreserveAllAnnotations) { 2331 runtime_invisible_parameter_annotations_length = method_attribute_length; 2332 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 2333 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 2334 } 2335 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2336 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2337 if (annotation_default != NULL) { 2338 classfile_parse_error( 2339 "Multiple AnnotationDefault attributes for method in class file %s", 2340 CHECK_(nullHandle)); 2341 } 2342 annotation_default_length = method_attribute_length; 2343 annotation_default = cfs->get_u1_buffer(); 2344 assert(annotation_default != NULL, "null annotation default"); 2345 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 2346 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2347 if (runtime_visible_type_annotations != NULL) { 2348 classfile_parse_error( 2349 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2350 CHECK_(nullHandle)); 2351 } 2352 runtime_visible_type_annotations_length = method_attribute_length; 2353 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2354 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2355 // No need for the VM to parse Type annotations 2356 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle)); 2357 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2358 if (runtime_invisible_type_annotations_exists) { 2359 classfile_parse_error( 2360 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2361 CHECK_(nullHandle)); 2362 } else { 2363 runtime_invisible_type_annotations_exists = true; 2364 } 2365 if (PreserveAllAnnotations) { 2366 runtime_invisible_type_annotations_length = method_attribute_length; 2367 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 2368 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2369 } 2370 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2371 } else { 2372 // Skip unknown attributes 2373 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2374 } 2375 } else { 2376 // Skip unknown attributes 2377 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2378 } 2379 } 2380 2381 if (linenumber_table != NULL) { 2382 linenumber_table->write_terminator(); 2383 linenumber_table_length = linenumber_table->position(); 2384 } 2385 2386 // Make sure there's at least one Code attribute in non-native/non-abstract method 2387 if (_need_verify) { 2388 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 2389 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 2390 } 2391 2392 // All sizing information for a Method* is finally available, now create it 2393 InlineTableSizes sizes( 2394 total_lvt_length, 2395 linenumber_table_length, 2396 exception_table_length, 2397 checked_exceptions_length, 2398 method_parameters_length, 2399 generic_signature_index, 2400 runtime_visible_annotations_length + 2401 runtime_invisible_annotations_length, 2402 runtime_visible_parameter_annotations_length + 2403 runtime_invisible_parameter_annotations_length, 2404 runtime_visible_type_annotations_length + 2405 runtime_invisible_type_annotations_length, 2406 annotation_default_length, 2407 0); 2408 2409 Method* m = Method::allocate( 2410 _loader_data, code_length, access_flags, &sizes, 2411 ConstMethod::NORMAL, CHECK_(nullHandle)); 2412 2413 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize); 2414 2415 // Fill in information from fixed part (access_flags already set) 2416 m->set_constants(_cp); 2417 m->set_name_index(name_index); 2418 m->set_signature_index(signature_index); 2419#ifdef CC_INTERP 2420 // hmm is there a gc issue here?? 2421 ResultTypeFinder rtf(_cp->symbol_at(signature_index)); 2422 m->set_result_index(rtf.type()); 2423#endif 2424 2425 if (args_size >= 0) { 2426 m->set_size_of_parameters(args_size); 2427 } else { 2428 m->compute_size_of_parameters(THREAD); 2429 } 2430#ifdef ASSERT 2431 if (args_size >= 0) { 2432 m->compute_size_of_parameters(THREAD); 2433 assert(args_size == m->size_of_parameters(), ""); 2434 } 2435#endif 2436 2437 // Fill in code attribute information 2438 m->set_max_stack(max_stack); 2439 m->set_max_locals(max_locals); 2440 if (stackmap_data != NULL) { 2441 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data, 2442 stackmap_data_length, CHECK_NULL); 2443 } 2444 2445 // Copy byte codes 2446 m->set_code(code_start); 2447 2448 // Copy line number table 2449 if (linenumber_table != NULL) { 2450 memcpy(m->compressed_linenumber_table(), 2451 linenumber_table->buffer(), linenumber_table_length); 2452 } 2453 2454 // Copy exception table 2455 if (exception_table_length > 0) { 2456 int size = 2457 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2); 2458 copy_u2_with_conversion((u2*) m->exception_table_start(), 2459 exception_table_start, size); 2460 } 2461 2462 // Copy method parameters 2463 if (method_parameters_length > 0) { 2464 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2465 for (int i = 0; i < method_parameters_length; i++) { 2466 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data); 2467 method_parameters_data += 2; 2468 elem[i].flags = Bytes::get_Java_u2(method_parameters_data); 2469 method_parameters_data += 2; 2470 } 2471 } 2472 2473 // Copy checked exceptions 2474 if (checked_exceptions_length > 0) { 2475 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 2476 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 2477 } 2478 2479 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2480 if (total_lvt_length > 0) { 2481 promoted_flags->set_has_localvariable_table(); 2482 copy_localvariable_table(m->constMethod(), lvt_cnt, 2483 localvariable_table_length, 2484 localvariable_table_start, 2485 lvtt_cnt, 2486 localvariable_type_table_length, 2487 localvariable_type_table_start, CHECK_NULL); 2488 } 2489 2490 if (parsed_annotations.has_any_annotations()) 2491 parsed_annotations.apply_to(m); 2492 2493 // Copy annotations 2494 copy_method_annotations(m->constMethod(), 2495 runtime_visible_annotations, 2496 runtime_visible_annotations_length, 2497 runtime_invisible_annotations, 2498 runtime_invisible_annotations_length, 2499 runtime_visible_parameter_annotations, 2500 runtime_visible_parameter_annotations_length, 2501 runtime_invisible_parameter_annotations, 2502 runtime_invisible_parameter_annotations_length, 2503 runtime_visible_type_annotations, 2504 runtime_visible_type_annotations_length, 2505 runtime_invisible_type_annotations, 2506 runtime_invisible_type_annotations_length, 2507 annotation_default, 2508 annotation_default_length, 2509 CHECK_NULL); 2510 2511 if (name == vmSymbols::finalize_method_name() && 2512 signature == vmSymbols::void_method_signature()) { 2513 if (m->is_empty_method()) { 2514 _has_empty_finalizer = true; 2515 } else { 2516 _has_finalizer = true; 2517 } 2518 } 2519 if (name == vmSymbols::object_initializer_name() && 2520 signature == vmSymbols::void_method_signature() && 2521 m->is_vanilla_constructor()) { 2522 _has_vanilla_constructor = true; 2523 } 2524 2525 NOT_PRODUCT(m->verify()); 2526 return m; 2527} 2528 2529 2530// The promoted_flags parameter is used to pass relevant access_flags 2531// from the methods back up to the containing klass. These flag values 2532// are added to klass's access_flags. 2533 2534Array<Method*>* ClassFileParser::parse_methods(bool is_interface, 2535 AccessFlags* promoted_flags, 2536 bool* has_final_method, 2537 bool* declares_default_methods, 2538 TRAPS) { 2539 ClassFileStream* cfs = stream(); 2540 cfs->guarantee_more(2, CHECK_NULL); // length 2541 u2 length = cfs->get_u2_fast(); 2542 if (length == 0) { 2543 _methods = Universe::the_empty_method_array(); 2544 } else { 2545 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL); 2546 2547 HandleMark hm(THREAD); 2548 for (int index = 0; index < length; index++) { 2549 methodHandle method = parse_method(is_interface, 2550 promoted_flags, 2551 CHECK_NULL); 2552 2553 if (method->is_final()) { 2554 *has_final_method = true; 2555 } 2556 // declares_default_methods: declares concrete instance methods, any access flags 2557 // used for interface initialization, and default method inheritance analysis 2558 if (is_interface && !(*declares_default_methods) 2559 && !method->is_abstract() && !method->is_static()) { 2560 *declares_default_methods = true; 2561 } 2562 _methods->at_put(index, method()); 2563 } 2564 2565 if (_need_verify && length > 1) { 2566 // Check duplicated methods 2567 ResourceMark rm(THREAD); 2568 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2569 THREAD, NameSigHash*, HASH_ROW_SIZE); 2570 initialize_hashtable(names_and_sigs); 2571 bool dup = false; 2572 { 2573 debug_only(No_Safepoint_Verifier nsv;) 2574 for (int i = 0; i < length; i++) { 2575 Method* m = _methods->at(i); 2576 // If no duplicates, add name/signature in hashtable names_and_sigs. 2577 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 2578 dup = true; 2579 break; 2580 } 2581 } 2582 } 2583 if (dup) { 2584 classfile_parse_error("Duplicate method name&signature in class file %s", 2585 CHECK_NULL); 2586 } 2587 } 2588 } 2589 return _methods; 2590} 2591 2592 2593intArray* ClassFileParser::sort_methods(Array<Method*>* methods) { 2594 int length = methods->length(); 2595 // If JVMTI original method ordering or sharing is enabled we have to 2596 // remember the original class file ordering. 2597 // We temporarily use the vtable_index field in the Method* to store the 2598 // class file index, so we can read in after calling qsort. 2599 // Put the method ordering in the shared archive. 2600 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2601 for (int index = 0; index < length; index++) { 2602 Method* m = methods->at(index); 2603 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2604 m->set_vtable_index(index); 2605 } 2606 } 2607 // Sort method array by ascending method name (for faster lookups & vtable construction) 2608 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2609 Method::sort_methods(methods); 2610 2611 intArray* method_ordering = NULL; 2612 // If JVMTI original method ordering or sharing is enabled construct int 2613 // array remembering the original ordering 2614 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2615 method_ordering = new intArray(length); 2616 for (int index = 0; index < length; index++) { 2617 Method* m = methods->at(index); 2618 int old_index = m->vtable_index(); 2619 assert(old_index >= 0 && old_index < length, "invalid method index"); 2620 method_ordering->at_put(index, old_index); 2621 m->set_vtable_index(Method::invalid_vtable_index); 2622 } 2623 } 2624 return method_ordering; 2625} 2626 2627// Parse generic_signature attribute for methods and fields 2628u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) { 2629 ClassFileStream* cfs = stream(); 2630 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 2631 u2 generic_signature_index = cfs->get_u2_fast(); 2632 check_property( 2633 valid_symbol_at(generic_signature_index), 2634 "Invalid Signature attribute at constant pool index %u in class file %s", 2635 generic_signature_index, CHECK_0); 2636 return generic_signature_index; 2637} 2638 2639void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) { 2640 ClassFileStream* cfs = stream(); 2641 cfs->guarantee_more(2, CHECK); // sourcefile_index 2642 u2 sourcefile_index = cfs->get_u2_fast(); 2643 check_property( 2644 valid_symbol_at(sourcefile_index), 2645 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2646 sourcefile_index, CHECK); 2647 set_class_sourcefile_index(sourcefile_index); 2648} 2649 2650 2651 2652void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) { 2653 ClassFileStream* cfs = stream(); 2654 u1* sde_buffer = cfs->get_u1_buffer(); 2655 assert(sde_buffer != NULL, "null sde buffer"); 2656 2657 // Don't bother storing it if there is no way to retrieve it 2658 if (JvmtiExport::can_get_source_debug_extension()) { 2659 assert((length+1) > length, "Overflow checking"); 2660 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 2661 for (int i = 0; i < length; i++) { 2662 sde[i] = sde_buffer[i]; 2663 } 2664 sde[length] = '\0'; 2665 set_class_sde_buffer((char*)sde, length); 2666 } 2667 // Got utf8 string, set stream position forward 2668 cfs->skip_u1(length, CHECK); 2669} 2670 2671 2672// Inner classes can be static, private or protected (classic VM does this) 2673#define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2674 2675// Return number of classes in the inner classes attribute table 2676u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start, 2677 bool parsed_enclosingmethod_attribute, 2678 u2 enclosing_method_class_index, 2679 u2 enclosing_method_method_index, 2680 TRAPS) { 2681 ClassFileStream* cfs = stream(); 2682 u1* current_mark = cfs->current(); 2683 u2 length = 0; 2684 if (inner_classes_attribute_start != NULL) { 2685 cfs->set_current(inner_classes_attribute_start); 2686 cfs->guarantee_more(2, CHECK_0); // length 2687 length = cfs->get_u2_fast(); 2688 } 2689 2690 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 2691 // method data: 2692 // [inner_class_info_index, 2693 // outer_class_info_index, 2694 // inner_name_index, 2695 // inner_class_access_flags, 2696 // ... 2697 // enclosing_method_class_index, 2698 // enclosing_method_method_index] 2699 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 2700 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 2701 _inner_classes = inner_classes; 2702 2703 int index = 0; 2704 int cp_size = _cp->length(); 2705 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2706 for (int n = 0; n < length; n++) { 2707 // Inner class index 2708 u2 inner_class_info_index = cfs->get_u2_fast(); 2709 check_property( 2710 valid_klass_reference_at(inner_class_info_index), 2711 "inner_class_info_index %u has bad constant type in class file %s", 2712 inner_class_info_index, CHECK_0); 2713 // Outer class index 2714 u2 outer_class_info_index = cfs->get_u2_fast(); 2715 check_property( 2716 outer_class_info_index == 0 || 2717 valid_klass_reference_at(outer_class_info_index), 2718 "outer_class_info_index %u has bad constant type in class file %s", 2719 outer_class_info_index, CHECK_0); 2720 // Inner class name 2721 u2 inner_name_index = cfs->get_u2_fast(); 2722 check_property( 2723 inner_name_index == 0 || valid_symbol_at(inner_name_index), 2724 "inner_name_index %u has bad constant type in class file %s", 2725 inner_name_index, CHECK_0); 2726 if (_need_verify) { 2727 guarantee_property(inner_class_info_index != outer_class_info_index, 2728 "Class is both outer and inner class in class file %s", CHECK_0); 2729 } 2730 // Access flags 2731 AccessFlags inner_access_flags; 2732 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2733 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2734 // Set abstract bit for old class files for backward compatibility 2735 flags |= JVM_ACC_ABSTRACT; 2736 } 2737 verify_legal_class_modifiers(flags, CHECK_0); 2738 inner_access_flags.set_flags(flags); 2739 2740 inner_classes->at_put(index++, inner_class_info_index); 2741 inner_classes->at_put(index++, outer_class_info_index); 2742 inner_classes->at_put(index++, inner_name_index); 2743 inner_classes->at_put(index++, inner_access_flags.as_short()); 2744 } 2745 2746 // 4347400: make sure there's no duplicate entry in the classes array 2747 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2748 for(int i = 0; i < length * 4; i += 4) { 2749 for(int j = i + 4; j < length * 4; j += 4) { 2750 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 2751 inner_classes->at(i+1) != inner_classes->at(j+1) || 2752 inner_classes->at(i+2) != inner_classes->at(j+2) || 2753 inner_classes->at(i+3) != inner_classes->at(j+3)), 2754 "Duplicate entry in InnerClasses in class file %s", 2755 CHECK_0); 2756 } 2757 } 2758 } 2759 2760 // Set EnclosingMethod class and method indexes. 2761 if (parsed_enclosingmethod_attribute) { 2762 inner_classes->at_put(index++, enclosing_method_class_index); 2763 inner_classes->at_put(index++, enclosing_method_method_index); 2764 } 2765 assert(index == size, "wrong size"); 2766 2767 // Restore buffer's current position. 2768 cfs->set_current(current_mark); 2769 2770 return length; 2771} 2772 2773void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 2774 set_class_synthetic_flag(true); 2775} 2776 2777void ClassFileParser::parse_classfile_signature_attribute(TRAPS) { 2778 ClassFileStream* cfs = stream(); 2779 u2 signature_index = cfs->get_u2(CHECK); 2780 check_property( 2781 valid_symbol_at(signature_index), 2782 "Invalid constant pool index %u in Signature attribute in class file %s", 2783 signature_index, CHECK); 2784 set_class_generic_signature_index(signature_index); 2785} 2786 2787void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) { 2788 ClassFileStream* cfs = stream(); 2789 u1* current_start = cfs->current(); 2790 2791 guarantee_property(attribute_byte_length >= sizeof(u2), 2792 "Invalid BootstrapMethods attribute length %u in class file %s", 2793 attribute_byte_length, 2794 CHECK); 2795 2796 cfs->guarantee_more(attribute_byte_length, CHECK); 2797 2798 int attribute_array_length = cfs->get_u2_fast(); 2799 2800 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 2801 "Short length on BootstrapMethods in class file %s", 2802 CHECK); 2803 2804 2805 // The attribute contains a counted array of counted tuples of shorts, 2806 // represending bootstrap specifiers: 2807 // length*{bootstrap_method_index, argument_count*{argument_index}} 2808 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 2809 // operand_count = number of shorts in attr, except for leading length 2810 2811 // The attribute is copied into a short[] array. 2812 // The array begins with a series of short[2] pairs, one for each tuple. 2813 int index_size = (attribute_array_length * 2); 2814 2815 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 2816 2817 // Eagerly assign operands so they will be deallocated with the constant 2818 // pool if there is an error. 2819 _cp->set_operands(operands); 2820 2821 int operand_fill_index = index_size; 2822 int cp_size = _cp->length(); 2823 2824 for (int n = 0; n < attribute_array_length; n++) { 2825 // Store a 32-bit offset into the header of the operand array. 2826 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 2827 2828 // Read a bootstrap specifier. 2829 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 2830 u2 bootstrap_method_index = cfs->get_u2_fast(); 2831 u2 argument_count = cfs->get_u2_fast(); 2832 check_property( 2833 valid_cp_range(bootstrap_method_index, cp_size) && 2834 _cp->tag_at(bootstrap_method_index).is_method_handle(), 2835 "bootstrap_method_index %u has bad constant type in class file %s", 2836 bootstrap_method_index, 2837 CHECK); 2838 2839 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 2840 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 2841 CHECK); 2842 2843 operands->at_put(operand_fill_index++, bootstrap_method_index); 2844 operands->at_put(operand_fill_index++, argument_count); 2845 2846 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 2847 for (int j = 0; j < argument_count; j++) { 2848 u2 argument_index = cfs->get_u2_fast(); 2849 check_property( 2850 valid_cp_range(argument_index, cp_size) && 2851 _cp->tag_at(argument_index).is_loadable_constant(), 2852 "argument_index %u has bad constant type in class file %s", 2853 argument_index, 2854 CHECK); 2855 operands->at_put(operand_fill_index++, argument_index); 2856 } 2857 } 2858 2859 u1* current_end = cfs->current(); 2860 guarantee_property(current_end == current_start + attribute_byte_length, 2861 "Bad length on BootstrapMethods in class file %s", 2862 CHECK); 2863} 2864 2865void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations, 2866 TRAPS) { 2867 ClassFileStream* cfs = stream(); 2868 // Set inner classes attribute to default sentinel 2869 _inner_classes = Universe::the_empty_short_array(); 2870 cfs->guarantee_more(2, CHECK); // attributes_count 2871 u2 attributes_count = cfs->get_u2_fast(); 2872 bool parsed_sourcefile_attribute = false; 2873 bool parsed_innerclasses_attribute = false; 2874 bool parsed_enclosingmethod_attribute = false; 2875 bool parsed_bootstrap_methods_attribute = false; 2876 u1* runtime_visible_annotations = NULL; 2877 int runtime_visible_annotations_length = 0; 2878 u1* runtime_invisible_annotations = NULL; 2879 int runtime_invisible_annotations_length = 0; 2880 u1* runtime_visible_type_annotations = NULL; 2881 int runtime_visible_type_annotations_length = 0; 2882 u1* runtime_invisible_type_annotations = NULL; 2883 int runtime_invisible_type_annotations_length = 0; 2884 bool runtime_invisible_type_annotations_exists = false; 2885 bool runtime_invisible_annotations_exists = false; 2886 bool parsed_source_debug_ext_annotations_exist = false; 2887 u1* inner_classes_attribute_start = NULL; 2888 u4 inner_classes_attribute_length = 0; 2889 u2 enclosing_method_class_index = 0; 2890 u2 enclosing_method_method_index = 0; 2891 // Iterate over attributes 2892 while (attributes_count--) { 2893 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2894 u2 attribute_name_index = cfs->get_u2_fast(); 2895 u4 attribute_length = cfs->get_u4_fast(); 2896 check_property( 2897 valid_symbol_at(attribute_name_index), 2898 "Attribute name has bad constant pool index %u in class file %s", 2899 attribute_name_index, CHECK); 2900 Symbol* tag = _cp->symbol_at(attribute_name_index); 2901 if (tag == vmSymbols::tag_source_file()) { 2902 // Check for SourceFile tag 2903 if (_need_verify) { 2904 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2905 } 2906 if (parsed_sourcefile_attribute) { 2907 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2908 } else { 2909 parsed_sourcefile_attribute = true; 2910 } 2911 parse_classfile_sourcefile_attribute(CHECK); 2912 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2913 // Check for SourceDebugExtension tag 2914 if (parsed_source_debug_ext_annotations_exist) { 2915 classfile_parse_error( 2916 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 2917 } 2918 parsed_source_debug_ext_annotations_exist = true; 2919 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK); 2920 } else if (tag == vmSymbols::tag_inner_classes()) { 2921 // Check for InnerClasses tag 2922 if (parsed_innerclasses_attribute) { 2923 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2924 } else { 2925 parsed_innerclasses_attribute = true; 2926 } 2927 inner_classes_attribute_start = cfs->get_u1_buffer(); 2928 inner_classes_attribute_length = attribute_length; 2929 cfs->skip_u1(inner_classes_attribute_length, CHECK); 2930 } else if (tag == vmSymbols::tag_synthetic()) { 2931 // Check for Synthetic tag 2932 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2933 if (attribute_length != 0) { 2934 classfile_parse_error( 2935 "Invalid Synthetic classfile attribute length %u in class file %s", 2936 attribute_length, CHECK); 2937 } 2938 parse_classfile_synthetic_attribute(CHECK); 2939 } else if (tag == vmSymbols::tag_deprecated()) { 2940 // Check for Deprecatd tag - 4276120 2941 if (attribute_length != 0) { 2942 classfile_parse_error( 2943 "Invalid Deprecated classfile attribute length %u in class file %s", 2944 attribute_length, CHECK); 2945 } 2946 } else if (_major_version >= JAVA_1_5_VERSION) { 2947 if (tag == vmSymbols::tag_signature()) { 2948 if (attribute_length != 2) { 2949 classfile_parse_error( 2950 "Wrong Signature attribute length %u in class file %s", 2951 attribute_length, CHECK); 2952 } 2953 parse_classfile_signature_attribute(CHECK); 2954 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2955 if (runtime_visible_annotations != NULL) { 2956 classfile_parse_error( 2957 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 2958 } 2959 runtime_visible_annotations_length = attribute_length; 2960 runtime_visible_annotations = cfs->get_u1_buffer(); 2961 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2962 parse_annotations(runtime_visible_annotations, 2963 runtime_visible_annotations_length, 2964 parsed_annotations); 2965 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2966 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 2967 if (runtime_invisible_annotations_exists) { 2968 classfile_parse_error( 2969 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 2970 } 2971 runtime_invisible_annotations_exists = true; 2972 if (PreserveAllAnnotations) { 2973 runtime_invisible_annotations_length = attribute_length; 2974 runtime_invisible_annotations = cfs->get_u1_buffer(); 2975 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2976 } 2977 cfs->skip_u1(attribute_length, CHECK); 2978 } else if (tag == vmSymbols::tag_enclosing_method()) { 2979 if (parsed_enclosingmethod_attribute) { 2980 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 2981 } else { 2982 parsed_enclosingmethod_attribute = true; 2983 } 2984 guarantee_property(attribute_length == 4, 2985 "Wrong EnclosingMethod attribute length %u in class file %s", 2986 attribute_length, CHECK); 2987 cfs->guarantee_more(4, CHECK); // class_index, method_index 2988 enclosing_method_class_index = cfs->get_u2_fast(); 2989 enclosing_method_method_index = cfs->get_u2_fast(); 2990 if (enclosing_method_class_index == 0) { 2991 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 2992 } 2993 // Validate the constant pool indices and types 2994 check_property(valid_klass_reference_at(enclosing_method_class_index), 2995 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 2996 if (enclosing_method_method_index != 0 && 2997 (!_cp->is_within_bounds(enclosing_method_method_index) || 2998 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 2999 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3000 } 3001 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3002 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3003 if (parsed_bootstrap_methods_attribute) 3004 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3005 parsed_bootstrap_methods_attribute = true; 3006 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK); 3007 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3008 if (runtime_visible_type_annotations != NULL) { 3009 classfile_parse_error( 3010 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3011 } 3012 runtime_visible_type_annotations_length = attribute_length; 3013 runtime_visible_type_annotations = cfs->get_u1_buffer(); 3014 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3015 // No need for the VM to parse Type annotations 3016 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3017 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3018 if (runtime_invisible_type_annotations_exists) { 3019 classfile_parse_error( 3020 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3021 } else { 3022 runtime_invisible_type_annotations_exists = true; 3023 } 3024 if (PreserveAllAnnotations) { 3025 runtime_invisible_type_annotations_length = attribute_length; 3026 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 3027 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3028 } 3029 cfs->skip_u1(attribute_length, CHECK); 3030 } else { 3031 // Unknown attribute 3032 cfs->skip_u1(attribute_length, CHECK); 3033 } 3034 } else { 3035 // Unknown attribute 3036 cfs->skip_u1(attribute_length, CHECK); 3037 } 3038 } 3039 _annotations = assemble_annotations(runtime_visible_annotations, 3040 runtime_visible_annotations_length, 3041 runtime_invisible_annotations, 3042 runtime_invisible_annotations_length, 3043 CHECK); 3044 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 3045 runtime_visible_type_annotations_length, 3046 runtime_invisible_type_annotations, 3047 runtime_invisible_type_annotations_length, 3048 CHECK); 3049 3050 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3051 u2 num_of_classes = parse_classfile_inner_classes_attribute( 3052 inner_classes_attribute_start, 3053 parsed_innerclasses_attribute, 3054 enclosing_method_class_index, 3055 enclosing_method_method_index, 3056 CHECK); 3057 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { 3058 guarantee_property( 3059 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3060 "Wrong InnerClasses attribute length in class file %s", CHECK); 3061 } 3062 } 3063 3064 if (_max_bootstrap_specifier_index >= 0) { 3065 guarantee_property(parsed_bootstrap_methods_attribute, 3066 "Missing BootstrapMethods attribute in class file %s", CHECK); 3067 } 3068} 3069 3070void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) { 3071 if (_synthetic_flag) 3072 k->set_is_synthetic(); 3073 if (_sourcefile_index != 0) { 3074 k->set_source_file_name_index(_sourcefile_index); 3075 } 3076 if (_generic_signature_index != 0) { 3077 k->set_generic_signature_index(_generic_signature_index); 3078 } 3079 if (_sde_buffer != NULL) { 3080 k->set_source_debug_extension(_sde_buffer, _sde_length); 3081 } 3082} 3083 3084// Create the Annotations object that will 3085// hold the annotations array for the Klass. 3086void ClassFileParser::create_combined_annotations(TRAPS) { 3087 if (_annotations == NULL && 3088 _type_annotations == NULL && 3089 _fields_annotations == NULL && 3090 _fields_type_annotations == NULL) { 3091 // Don't create the Annotations object unnecessarily. 3092 return; 3093 } 3094 3095 Annotations* annotations = Annotations::allocate(_loader_data, CHECK); 3096 annotations->set_class_annotations(_annotations); 3097 annotations->set_class_type_annotations(_type_annotations); 3098 annotations->set_fields_annotations(_fields_annotations); 3099 annotations->set_fields_type_annotations(_fields_type_annotations); 3100 3101 // This is the Annotations object that will be 3102 // assigned to InstanceKlass being constructed. 3103 _combined_annotations = annotations; 3104 3105 // The annotations arrays below has been transfered the 3106 // _combined_annotations so these fields can now be cleared. 3107 _annotations = NULL; 3108 _type_annotations = NULL; 3109 _fields_annotations = NULL; 3110 _fields_type_annotations = NULL; 3111} 3112 3113// Transfer ownership of metadata allocated to the InstanceKlass. 3114void ClassFileParser::apply_parsed_class_metadata( 3115 instanceKlassHandle this_klass, 3116 int java_fields_count, TRAPS) { 3117 _cp->set_pool_holder(this_klass()); 3118 this_klass->set_constants(_cp); 3119 this_klass->set_fields(_fields, java_fields_count); 3120 this_klass->set_methods(_methods); 3121 this_klass->set_inner_classes(_inner_classes); 3122 this_klass->set_local_interfaces(_local_interfaces); 3123 this_klass->set_transitive_interfaces(_transitive_interfaces); 3124 this_klass->set_annotations(_combined_annotations); 3125 3126 // Clear out these fields so they don't get deallocated by the destructor 3127 clear_class_metadata(); 3128} 3129 3130AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 3131 int runtime_visible_annotations_length, 3132 u1* runtime_invisible_annotations, 3133 int runtime_invisible_annotations_length, TRAPS) { 3134 AnnotationArray* annotations = NULL; 3135 if (runtime_visible_annotations != NULL || 3136 runtime_invisible_annotations != NULL) { 3137 annotations = MetadataFactory::new_array<u1>(_loader_data, 3138 runtime_visible_annotations_length + 3139 runtime_invisible_annotations_length, 3140 CHECK_(annotations)); 3141 if (runtime_visible_annotations != NULL) { 3142 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3143 annotations->at_put(i, runtime_visible_annotations[i]); 3144 } 3145 } 3146 if (runtime_invisible_annotations != NULL) { 3147 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3148 int append = runtime_visible_annotations_length+i; 3149 annotations->at_put(append, runtime_invisible_annotations[i]); 3150 } 3151 } 3152 } 3153 return annotations; 3154} 3155 3156instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index, 3157 TRAPS) { 3158 instanceKlassHandle super_klass; 3159 if (super_class_index == 0) { 3160 check_property(_class_name == vmSymbols::java_lang_Object(), 3161 "Invalid superclass index %u in class file %s", 3162 super_class_index, 3163 CHECK_NULL); 3164 } else { 3165 check_property(valid_klass_reference_at(super_class_index), 3166 "Invalid superclass index %u in class file %s", 3167 super_class_index, 3168 CHECK_NULL); 3169 // The class name should be legal because it is checked when parsing constant pool. 3170 // However, make sure it is not an array type. 3171 bool is_array = false; 3172 if (_cp->tag_at(super_class_index).is_klass()) { 3173 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index)); 3174 if (_need_verify) 3175 is_array = super_klass->oop_is_array(); 3176 } else if (_need_verify) { 3177 is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3178 } 3179 if (_need_verify) { 3180 guarantee_property(!is_array, 3181 "Bad superclass name in class file %s", CHECK_NULL); 3182 } 3183 } 3184 return super_klass; 3185} 3186 3187 3188// Values needed for oopmap and InstanceKlass creation 3189class FieldLayoutInfo : public StackObj { 3190 public: 3191 int* nonstatic_oop_offsets; 3192 unsigned int* nonstatic_oop_counts; 3193 unsigned int nonstatic_oop_map_count; 3194 unsigned int total_oop_map_count; 3195 int instance_size; 3196 int nonstatic_field_size; 3197 int static_field_size; 3198 bool has_nonstatic_fields; 3199}; 3200 3201// Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3202void ClassFileParser::layout_fields(Handle class_loader, 3203 FieldAllocationCount* fac, 3204 ClassAnnotationCollector* parsed_annotations, 3205 FieldLayoutInfo* info, 3206 TRAPS) { 3207 3208 // Field size and offset computation 3209 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size(); 3210 int next_static_oop_offset; 3211 int next_static_double_offset; 3212 int next_static_word_offset; 3213 int next_static_short_offset; 3214 int next_static_byte_offset; 3215 int next_nonstatic_oop_offset; 3216 int next_nonstatic_double_offset; 3217 int next_nonstatic_word_offset; 3218 int next_nonstatic_short_offset; 3219 int next_nonstatic_byte_offset; 3220 int first_nonstatic_oop_offset; 3221 int next_nonstatic_field_offset; 3222 int next_nonstatic_padded_offset; 3223 3224 // Count the contended fields by type. 3225 // 3226 // We ignore static fields, because @Contended is not supported for them. 3227 // The layout code below will also ignore the static fields. 3228 int nonstatic_contended_count = 0; 3229 FieldAllocationCount fac_contended; 3230 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3231 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3232 if (fs.is_contended()) { 3233 fac_contended.count[atype]++; 3234 if (!fs.access_flags().is_static()) { 3235 nonstatic_contended_count++; 3236 } 3237 } 3238 } 3239 3240 3241 // Calculate the starting byte offsets 3242 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3243 next_static_double_offset = next_static_oop_offset + 3244 ((fac->count[STATIC_OOP]) * heapOopSize); 3245 if ( fac->count[STATIC_DOUBLE] && 3246 (Universe::field_type_should_be_aligned(T_DOUBLE) || 3247 Universe::field_type_should_be_aligned(T_LONG)) ) { 3248 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 3249 } 3250 3251 next_static_word_offset = next_static_double_offset + 3252 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3253 next_static_short_offset = next_static_word_offset + 3254 ((fac->count[STATIC_WORD]) * BytesPerInt); 3255 next_static_byte_offset = next_static_short_offset + 3256 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3257 3258 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3259 nonstatic_field_size * heapOopSize; 3260 3261 next_nonstatic_field_offset = nonstatic_fields_start; 3262 3263 bool is_contended_class = parsed_annotations->is_contended(); 3264 3265 // Class is contended, pad before all the fields 3266 if (is_contended_class) { 3267 next_nonstatic_field_offset += ContendedPaddingWidth; 3268 } 3269 3270 // Compute the non-contended fields count. 3271 // The packing code below relies on these counts to determine if some field 3272 // can be squeezed into the alignment gap. Contended fields are obviously 3273 // exempt from that. 3274 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3275 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3276 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3277 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3278 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3279 3280 // Total non-static fields count, including every contended field 3281 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 3282 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 3283 fac->count[NONSTATIC_OOP]; 3284 3285 bool super_has_nonstatic_fields = 3286 (_super_klass() != NULL && _super_klass->has_nonstatic_fields()); 3287 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0); 3288 3289 3290 // Prepare list of oops for oop map generation. 3291 // 3292 // "offset" and "count" lists are describing the set of contiguous oop 3293 // regions. offset[i] is the start of the i-th region, which then has 3294 // count[i] oops following. Before we know how many regions are required, 3295 // we pessimistically allocate the maps to fit all the oops into the 3296 // distinct regions. 3297 // 3298 // TODO: We add +1 to always allocate non-zero resource arrays; we need 3299 // to figure out if we still need to do this. 3300 int* nonstatic_oop_offsets; 3301 unsigned int* nonstatic_oop_counts; 3302 unsigned int nonstatic_oop_map_count = 0; 3303 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 3304 3305 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3306 THREAD, int, max_nonstatic_oop_maps); 3307 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3308 THREAD, unsigned int, max_nonstatic_oop_maps); 3309 3310 first_nonstatic_oop_offset = 0; // will be set for first oop field 3311 3312 bool compact_fields = CompactFields; 3313 int allocation_style = FieldsAllocationStyle; 3314 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3315 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3316 allocation_style = 1; // Optimistic 3317 } 3318 3319 // The next classes have predefined hard-coded fields offsets 3320 // (see in JavaClasses::compute_hard_coded_offsets()). 3321 // Use default fields allocation order for them. 3322 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 3323 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3324 _class_name == vmSymbols::java_lang_Class() || 3325 _class_name == vmSymbols::java_lang_ClassLoader() || 3326 _class_name == vmSymbols::java_lang_ref_Reference() || 3327 _class_name == vmSymbols::java_lang_ref_SoftReference() || 3328 _class_name == vmSymbols::java_lang_StackTraceElement() || 3329 _class_name == vmSymbols::java_lang_String() || 3330 _class_name == vmSymbols::java_lang_Throwable() || 3331 _class_name == vmSymbols::java_lang_Boolean() || 3332 _class_name == vmSymbols::java_lang_Character() || 3333 _class_name == vmSymbols::java_lang_Float() || 3334 _class_name == vmSymbols::java_lang_Double() || 3335 _class_name == vmSymbols::java_lang_Byte() || 3336 _class_name == vmSymbols::java_lang_Short() || 3337 _class_name == vmSymbols::java_lang_Integer() || 3338 _class_name == vmSymbols::java_lang_Long())) { 3339 allocation_style = 0; // Allocate oops first 3340 compact_fields = false; // Don't compact fields 3341 } 3342 3343 // Rearrange fields for a given allocation style 3344 if( allocation_style == 0 ) { 3345 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 3346 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3347 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3348 (nonstatic_oop_count * heapOopSize); 3349 } else if( allocation_style == 1 ) { 3350 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 3351 next_nonstatic_double_offset = next_nonstatic_field_offset; 3352 } else if( allocation_style == 2 ) { 3353 // Fields allocation: oops fields in super and sub classes are together. 3354 if( nonstatic_field_size > 0 && _super_klass() != NULL && 3355 _super_klass->nonstatic_oop_map_size() > 0 ) { 3356 unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 3357 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps(); 3358 OopMapBlock* last_map = first_map + map_count - 1; 3359 int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3360 if (next_offset == next_nonstatic_field_offset) { 3361 allocation_style = 0; // allocate oops first 3362 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3363 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3364 (nonstatic_oop_count * heapOopSize); 3365 } 3366 } 3367 if( allocation_style == 2 ) { 3368 allocation_style = 1; // allocate oops last 3369 next_nonstatic_double_offset = next_nonstatic_field_offset; 3370 } 3371 } else { 3372 ShouldNotReachHere(); 3373 } 3374 3375 int nonstatic_oop_space_count = 0; 3376 int nonstatic_word_space_count = 0; 3377 int nonstatic_short_space_count = 0; 3378 int nonstatic_byte_space_count = 0; 3379 int nonstatic_oop_space_offset; 3380 int nonstatic_word_space_offset; 3381 int nonstatic_short_space_offset; 3382 int nonstatic_byte_space_offset; 3383 3384 // Try to squeeze some of the fields into the gaps due to 3385 // long/double alignment. 3386 if( nonstatic_double_count > 0 ) { 3387 int offset = next_nonstatic_double_offset; 3388 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3389 if( compact_fields && offset != next_nonstatic_double_offset ) { 3390 // Allocate available fields into the gap before double field. 3391 int length = next_nonstatic_double_offset - offset; 3392 assert(length == BytesPerInt, ""); 3393 nonstatic_word_space_offset = offset; 3394 if( nonstatic_word_count > 0 ) { 3395 nonstatic_word_count -= 1; 3396 nonstatic_word_space_count = 1; // Only one will fit 3397 length -= BytesPerInt; 3398 offset += BytesPerInt; 3399 } 3400 nonstatic_short_space_offset = offset; 3401 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 3402 nonstatic_short_count -= 1; 3403 nonstatic_short_space_count += 1; 3404 length -= BytesPerShort; 3405 offset += BytesPerShort; 3406 } 3407 nonstatic_byte_space_offset = offset; 3408 while( length > 0 && nonstatic_byte_count > 0 ) { 3409 nonstatic_byte_count -= 1; 3410 nonstatic_byte_space_count += 1; 3411 length -= 1; 3412 } 3413 // Allocate oop field in the gap if there are no other fields for that. 3414 nonstatic_oop_space_offset = offset; 3415 if( length >= heapOopSize && nonstatic_oop_count > 0 && 3416 allocation_style != 0 ) { // when oop fields not first 3417 nonstatic_oop_count -= 1; 3418 nonstatic_oop_space_count = 1; // Only one will fit 3419 length -= heapOopSize; 3420 offset += heapOopSize; 3421 } 3422 } 3423 } 3424 3425 next_nonstatic_word_offset = next_nonstatic_double_offset + 3426 (nonstatic_double_count * BytesPerLong); 3427 next_nonstatic_short_offset = next_nonstatic_word_offset + 3428 (nonstatic_word_count * BytesPerInt); 3429 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3430 (nonstatic_short_count * BytesPerShort); 3431 next_nonstatic_padded_offset = next_nonstatic_byte_offset + 3432 nonstatic_byte_count; 3433 3434 // let oops jump before padding with this allocation style 3435 if( allocation_style == 1 ) { 3436 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 3437 if( nonstatic_oop_count > 0 ) { 3438 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3439 } 3440 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3441 } 3442 3443 // Iterate over fields again and compute correct offsets. 3444 // The field allocation type was temporarily stored in the offset slot. 3445 // oop fields are located before non-oop fields (static and non-static). 3446 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3447 3448 // skip already laid out fields 3449 if (fs.is_offset_set()) continue; 3450 3451 // contended instance fields are handled below 3452 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 3453 3454 int real_offset; 3455 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3456 3457 // pack the rest of the fields 3458 switch (atype) { 3459 case STATIC_OOP: 3460 real_offset = next_static_oop_offset; 3461 next_static_oop_offset += heapOopSize; 3462 break; 3463 case STATIC_BYTE: 3464 real_offset = next_static_byte_offset; 3465 next_static_byte_offset += 1; 3466 break; 3467 case STATIC_SHORT: 3468 real_offset = next_static_short_offset; 3469 next_static_short_offset += BytesPerShort; 3470 break; 3471 case STATIC_WORD: 3472 real_offset = next_static_word_offset; 3473 next_static_word_offset += BytesPerInt; 3474 break; 3475 case STATIC_DOUBLE: 3476 real_offset = next_static_double_offset; 3477 next_static_double_offset += BytesPerLong; 3478 break; 3479 case NONSTATIC_OOP: 3480 if( nonstatic_oop_space_count > 0 ) { 3481 real_offset = nonstatic_oop_space_offset; 3482 nonstatic_oop_space_offset += heapOopSize; 3483 nonstatic_oop_space_count -= 1; 3484 } else { 3485 real_offset = next_nonstatic_oop_offset; 3486 next_nonstatic_oop_offset += heapOopSize; 3487 } 3488 3489 // Record this oop in the oop maps 3490 if( nonstatic_oop_map_count > 0 && 3491 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3492 real_offset - 3493 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3494 heapOopSize ) { 3495 // This oop is adjacent to the previous one, add to current oop map 3496 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3497 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3498 } else { 3499 // This oop is not adjacent to the previous one, create new oop map 3500 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3501 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3502 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3503 nonstatic_oop_map_count += 1; 3504 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3505 first_nonstatic_oop_offset = real_offset; 3506 } 3507 } 3508 break; 3509 case NONSTATIC_BYTE: 3510 if( nonstatic_byte_space_count > 0 ) { 3511 real_offset = nonstatic_byte_space_offset; 3512 nonstatic_byte_space_offset += 1; 3513 nonstatic_byte_space_count -= 1; 3514 } else { 3515 real_offset = next_nonstatic_byte_offset; 3516 next_nonstatic_byte_offset += 1; 3517 } 3518 break; 3519 case NONSTATIC_SHORT: 3520 if( nonstatic_short_space_count > 0 ) { 3521 real_offset = nonstatic_short_space_offset; 3522 nonstatic_short_space_offset += BytesPerShort; 3523 nonstatic_short_space_count -= 1; 3524 } else { 3525 real_offset = next_nonstatic_short_offset; 3526 next_nonstatic_short_offset += BytesPerShort; 3527 } 3528 break; 3529 case NONSTATIC_WORD: 3530 if( nonstatic_word_space_count > 0 ) { 3531 real_offset = nonstatic_word_space_offset; 3532 nonstatic_word_space_offset += BytesPerInt; 3533 nonstatic_word_space_count -= 1; 3534 } else { 3535 real_offset = next_nonstatic_word_offset; 3536 next_nonstatic_word_offset += BytesPerInt; 3537 } 3538 break; 3539 case NONSTATIC_DOUBLE: 3540 real_offset = next_nonstatic_double_offset; 3541 next_nonstatic_double_offset += BytesPerLong; 3542 break; 3543 default: 3544 ShouldNotReachHere(); 3545 } 3546 fs.set_offset(real_offset); 3547 } 3548 3549 3550 // Handle the contended cases. 3551 // 3552 // Each contended field should not intersect the cache line with another contended field. 3553 // In the absence of alignment information, we end up with pessimistically separating 3554 // the fields with full-width padding. 3555 // 3556 // Additionally, this should not break alignment for the fields, so we round the alignment up 3557 // for each field. 3558 if (nonstatic_contended_count > 0) { 3559 3560 // if there is at least one contended field, we need to have pre-padding for them 3561 next_nonstatic_padded_offset += ContendedPaddingWidth; 3562 3563 // collect all contended groups 3564 BitMap bm(_cp->size()); 3565 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3566 // skip already laid out fields 3567 if (fs.is_offset_set()) continue; 3568 3569 if (fs.is_contended()) { 3570 bm.set_bit(fs.contended_group()); 3571 } 3572 } 3573 3574 int current_group = -1; 3575 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 3576 3577 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3578 3579 // skip already laid out fields 3580 if (fs.is_offset_set()) continue; 3581 3582 // skip non-contended fields and fields from different group 3583 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 3584 3585 // handle statics below 3586 if (fs.access_flags().is_static()) continue; 3587 3588 int real_offset; 3589 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3590 3591 switch (atype) { 3592 case NONSTATIC_BYTE: 3593 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1); 3594 real_offset = next_nonstatic_padded_offset; 3595 next_nonstatic_padded_offset += 1; 3596 break; 3597 3598 case NONSTATIC_SHORT: 3599 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort); 3600 real_offset = next_nonstatic_padded_offset; 3601 next_nonstatic_padded_offset += BytesPerShort; 3602 break; 3603 3604 case NONSTATIC_WORD: 3605 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt); 3606 real_offset = next_nonstatic_padded_offset; 3607 next_nonstatic_padded_offset += BytesPerInt; 3608 break; 3609 3610 case NONSTATIC_DOUBLE: 3611 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong); 3612 real_offset = next_nonstatic_padded_offset; 3613 next_nonstatic_padded_offset += BytesPerLong; 3614 break; 3615 3616 case NONSTATIC_OOP: 3617 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize); 3618 real_offset = next_nonstatic_padded_offset; 3619 next_nonstatic_padded_offset += heapOopSize; 3620 3621 // Record this oop in the oop maps 3622 if( nonstatic_oop_map_count > 0 && 3623 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3624 real_offset - 3625 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3626 heapOopSize ) { 3627 // This oop is adjacent to the previous one, add to current oop map 3628 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3629 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3630 } else { 3631 // This oop is not adjacent to the previous one, create new oop map 3632 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3633 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3634 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3635 nonstatic_oop_map_count += 1; 3636 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3637 first_nonstatic_oop_offset = real_offset; 3638 } 3639 } 3640 break; 3641 3642 default: 3643 ShouldNotReachHere(); 3644 } 3645 3646 if (fs.contended_group() == 0) { 3647 // Contended group defines the equivalence class over the fields: 3648 // the fields within the same contended group are not inter-padded. 3649 // The only exception is default group, which does not incur the 3650 // equivalence, and so requires intra-padding. 3651 next_nonstatic_padded_offset += ContendedPaddingWidth; 3652 } 3653 3654 fs.set_offset(real_offset); 3655 } // for 3656 3657 // Start laying out the next group. 3658 // Note that this will effectively pad the last group in the back; 3659 // this is expected to alleviate memory contention effects for 3660 // subclass fields and/or adjacent object. 3661 // If this was the default group, the padding is already in place. 3662 if (current_group != 0) { 3663 next_nonstatic_padded_offset += ContendedPaddingWidth; 3664 } 3665 } 3666 3667 // handle static fields 3668 } 3669 3670 // Entire class is contended, pad in the back. 3671 // This helps to alleviate memory contention effects for subclass fields 3672 // and/or adjacent object. 3673 if (is_contended_class) { 3674 next_nonstatic_padded_offset += ContendedPaddingWidth; 3675 } 3676 3677 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 3678 3679 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize); 3680 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize); 3681 int static_fields_end = align_size_up(next_static_byte_offset, wordSize); 3682 3683 int static_field_size = (static_fields_end - 3684 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 3685 nonstatic_field_size = nonstatic_field_size + 3686 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 3687 3688 int instance_size = align_object_size(instance_end / wordSize); 3689 3690 assert(instance_size == align_object_size(align_size_up( 3691 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 3692 wordSize) / wordSize), "consistent layout helper value"); 3693 3694 // Invariant: nonstatic_field end/start should only change if there are 3695 // nonstatic fields in the class, or if the class is contended. We compare 3696 // against the non-aligned value, so that end alignment will not fail the 3697 // assert without actually having the fields. 3698 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 3699 is_contended_class || 3700 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 3701 3702 // Number of non-static oop map blocks allocated at end of klass. 3703 const unsigned int total_oop_map_count = 3704 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 3705 first_nonstatic_oop_offset); 3706 3707#ifndef PRODUCT 3708 if (PrintFieldLayout) { 3709 print_field_layout(_class_name, 3710 _fields, 3711 _cp, 3712 instance_size, 3713 nonstatic_fields_start, 3714 nonstatic_fields_end, 3715 static_fields_end); 3716 } 3717 3718#endif 3719 // Pass back information needed for InstanceKlass creation 3720 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 3721 info->nonstatic_oop_counts = nonstatic_oop_counts; 3722 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 3723 info->total_oop_map_count = total_oop_map_count; 3724 info->instance_size = instance_size; 3725 info->static_field_size = static_field_size; 3726 info->nonstatic_field_size = nonstatic_field_size; 3727 info->has_nonstatic_fields = has_nonstatic_fields; 3728} 3729 3730 3731instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name, 3732 ClassLoaderData* loader_data, 3733 Handle protection_domain, 3734 KlassHandle host_klass, 3735 GrowableArray<Handle>* cp_patches, 3736 TempNewSymbol& parsed_name, 3737 bool verify, 3738 TRAPS) { 3739 3740 // When a retransformable agent is attached, JVMTI caches the 3741 // class bytes that existed before the first retransformation. 3742 // If RedefineClasses() was used before the retransformable 3743 // agent attached, then the cached class bytes may not be the 3744 // original class bytes. 3745 JvmtiCachedClassFileData *cached_class_file = NULL; 3746 Handle class_loader(THREAD, loader_data->class_loader()); 3747 bool has_default_methods = false; 3748 bool declares_default_methods = false; 3749 ResourceMark rm(THREAD); 3750 3751 ClassFileStream* cfs = stream(); 3752 // Timing 3753 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 3754 JavaThread* jt = (JavaThread*) THREAD; 3755 3756 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), 3757 ClassLoader::perf_class_parse_selftime(), 3758 NULL, 3759 jt->get_thread_stat()->perf_recursion_counts_addr(), 3760 jt->get_thread_stat()->perf_timers_addr(), 3761 PerfClassTraceTime::PARSE_CLASS); 3762 3763 init_parsed_class_attributes(loader_data); 3764 3765 if (JvmtiExport::should_post_class_file_load_hook()) { 3766 // Get the cached class file bytes (if any) from the class that 3767 // is being redefined or retransformed. We use jvmti_thread_state() 3768 // instead of JvmtiThreadState::state_for(jt) so we don't allocate 3769 // a JvmtiThreadState any earlier than necessary. This will help 3770 // avoid the bug described by 7126851. 3771 JvmtiThreadState *state = jt->jvmti_thread_state(); 3772 if (state != NULL) { 3773 KlassHandle *h_class_being_redefined = 3774 state->get_class_being_redefined(); 3775 if (h_class_being_redefined != NULL) { 3776 instanceKlassHandle ikh_class_being_redefined = 3777 instanceKlassHandle(THREAD, (*h_class_being_redefined)()); 3778 cached_class_file = ikh_class_being_redefined->get_cached_class_file(); 3779 } 3780 } 3781 3782 unsigned char* ptr = cfs->buffer(); 3783 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 3784 3785 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain, 3786 &ptr, &end_ptr, &cached_class_file); 3787 3788 if (ptr != cfs->buffer()) { 3789 // JVMTI agent has modified class file data. 3790 // Set new class file stream using JVMTI agent modified 3791 // class file data. 3792 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 3793 set_stream(cfs); 3794 } 3795 } 3796 3797 _host_klass = host_klass; 3798 _cp_patches = cp_patches; 3799 3800 instanceKlassHandle nullHandle; 3801 3802 // Figure out whether we can skip format checking (matching classic VM behavior) 3803 if (DumpSharedSpaces) { 3804 // verify == true means it's a 'remote' class (i.e., non-boot class) 3805 // Verification decision is based on BytecodeVerificationRemote flag 3806 // for those classes. 3807 _need_verify = (verify) ? BytecodeVerificationRemote : 3808 BytecodeVerificationLocal; 3809 } else { 3810 _need_verify = Verifier::should_verify_for(class_loader(), verify); 3811 } 3812 3813 // Set the verify flag in stream 3814 cfs->set_verify(_need_verify); 3815 3816 // Save the class file name for easier error message printing. 3817 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name(); 3818 3819 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 3820 // Magic value 3821 u4 magic = cfs->get_u4_fast(); 3822 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 3823 "Incompatible magic value %u in class file %s", 3824 magic, CHECK_(nullHandle)); 3825 3826 // Version numbers 3827 u2 minor_version = cfs->get_u2_fast(); 3828 u2 major_version = cfs->get_u2_fast(); 3829 3830 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) { 3831 ResourceMark rm; 3832 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", 3833 major_version, minor_version, name->as_C_string()); 3834 Exceptions::fthrow( 3835 THREAD_AND_LOCATION, 3836 vmSymbols::java_lang_UnsupportedClassVersionError(), 3837 "Unsupported major.minor version for dump time %u.%u", 3838 major_version, 3839 minor_version); 3840 } 3841 3842 // Check version numbers - we check this even with verifier off 3843 if (!is_supported_version(major_version, minor_version)) { 3844 if (name == NULL) { 3845 Exceptions::fthrow( 3846 THREAD_AND_LOCATION, 3847 vmSymbols::java_lang_UnsupportedClassVersionError(), 3848 "Unsupported class file version %u.%u, " 3849 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3850 major_version, 3851 minor_version, 3852 JAVA_MAX_SUPPORTED_VERSION, 3853 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3854 } else { 3855 ResourceMark rm(THREAD); 3856 Exceptions::fthrow( 3857 THREAD_AND_LOCATION, 3858 vmSymbols::java_lang_UnsupportedClassVersionError(), 3859 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 3860 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3861 name->as_C_string(), 3862 major_version, 3863 minor_version, 3864 JAVA_MAX_SUPPORTED_VERSION, 3865 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3866 } 3867 return nullHandle; 3868 } 3869 3870 _major_version = major_version; 3871 _minor_version = minor_version; 3872 3873 3874 // Check if verification needs to be relaxed for this class file 3875 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 3876 _relax_verify = Verifier::relax_verify_for(class_loader()); 3877 3878 // Constant pool 3879 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 3880 3881 int cp_size = cp->length(); 3882 3883 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 3884 3885 // Access flags 3886 AccessFlags access_flags; 3887 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 3888 3889 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3890 // Set abstract bit for old class files for backward compatibility 3891 flags |= JVM_ACC_ABSTRACT; 3892 } 3893 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 3894 access_flags.set_flags(flags); 3895 3896 // This class and superclass 3897 u2 this_class_index = cfs->get_u2_fast(); 3898 check_property( 3899 valid_cp_range(this_class_index, cp_size) && 3900 cp->tag_at(this_class_index).is_unresolved_klass(), 3901 "Invalid this class index %u in constant pool in class file %s", 3902 this_class_index, CHECK_(nullHandle)); 3903 3904 Symbol* class_name = cp->klass_name_at(this_class_index); 3905 assert(class_name != NULL, "class_name can't be null"); 3906 3907 // It's important to set parsed_name *before* resolving the super class. 3908 // (it's used for cleanup by the caller if parsing fails) 3909 parsed_name = class_name; 3910 // parsed_name is returned and can be used if there's an error, so add to 3911 // its reference count. Caller will decrement the refcount. 3912 parsed_name->increment_refcount(); 3913 3914 // Update _class_name which could be null previously to be class_name 3915 _class_name = class_name; 3916 3917 // Don't need to check whether this class name is legal or not. 3918 // It has been checked when constant pool is parsed. 3919 // However, make sure it is not an array type. 3920 if (_need_verify) { 3921 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 3922 "Bad class name in class file %s", 3923 CHECK_(nullHandle)); 3924 } 3925 3926 Klass* preserve_this_klass; // for storing result across HandleMark 3927 3928 // release all handles when parsing is done 3929 { HandleMark hm(THREAD); 3930 3931 // Checks if name in class file matches requested name 3932 if (name != NULL && class_name != name) { 3933 ResourceMark rm(THREAD); 3934 Exceptions::fthrow( 3935 THREAD_AND_LOCATION, 3936 vmSymbols::java_lang_NoClassDefFoundError(), 3937 "%s (wrong name: %s)", 3938 name->as_C_string(), 3939 class_name->as_C_string() 3940 ); 3941 return nullHandle; 3942 } 3943 3944 if (TraceClassLoadingPreorder) { 3945 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName"); 3946 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 3947 tty->print_cr("]"); 3948 } 3949#if INCLUDE_CDS 3950 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) { 3951 // Only dump the classes that can be stored into CDS archive 3952 if (SystemDictionaryShared::is_sharing_possible(loader_data)) { 3953 if (name != NULL) { 3954 ResourceMark rm(THREAD); 3955 classlist_file->print_cr("%s", name->as_C_string()); 3956 classlist_file->flush(); 3957 } 3958 } 3959 } 3960#endif 3961 3962 u2 super_class_index = cfs->get_u2_fast(); 3963 instanceKlassHandle super_klass = parse_super_class(super_class_index, 3964 CHECK_NULL); 3965 3966 // Interfaces 3967 u2 itfs_len = cfs->get_u2_fast(); 3968 Array<Klass*>* local_interfaces = 3969 parse_interfaces(itfs_len, protection_domain, _class_name, 3970 &has_default_methods, CHECK_(nullHandle)); 3971 3972 u2 java_fields_count = 0; 3973 // Fields (offsets are filled in later) 3974 FieldAllocationCount fac; 3975 Array<u2>* fields = parse_fields(class_name, 3976 access_flags.is_interface(), 3977 &fac, &java_fields_count, 3978 CHECK_(nullHandle)); 3979 // Methods 3980 bool has_final_method = false; 3981 AccessFlags promoted_flags; 3982 promoted_flags.set_flags(0); 3983 Array<Method*>* methods = parse_methods(access_flags.is_interface(), 3984 &promoted_flags, 3985 &has_final_method, 3986 &declares_default_methods, 3987 CHECK_(nullHandle)); 3988 3989 if (declares_default_methods) { 3990 has_default_methods = true; 3991 } 3992 3993 // Additional attributes 3994 ClassAnnotationCollector parsed_annotations; 3995 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle)); 3996 3997 // Finalize the Annotations metadata object, 3998 // now that all annotation arrays have been created. 3999 create_combined_annotations(CHECK_(nullHandle)); 4000 4001 // Make sure this is the end of class file stream 4002 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 4003 4004 // We check super class after class file is parsed and format is checked 4005 if (super_class_index > 0 && super_klass.is_null()) { 4006 Symbol* sk = cp->klass_name_at(super_class_index); 4007 if (access_flags.is_interface()) { 4008 // Before attempting to resolve the superclass, check for class format 4009 // errors not checked yet. 4010 guarantee_property(sk == vmSymbols::java_lang_Object(), 4011 "Interfaces must have java.lang.Object as superclass in class file %s", 4012 CHECK_(nullHandle)); 4013 } 4014 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk, 4015 class_loader, 4016 protection_domain, 4017 true, 4018 CHECK_(nullHandle)); 4019 4020 KlassHandle kh (THREAD, k); 4021 super_klass = instanceKlassHandle(THREAD, kh()); 4022 } 4023 if (super_klass.not_null()) { 4024 4025 if (super_klass->has_default_methods()) { 4026 has_default_methods = true; 4027 } 4028 4029 if (super_klass->is_interface()) { 4030 ResourceMark rm(THREAD); 4031 Exceptions::fthrow( 4032 THREAD_AND_LOCATION, 4033 vmSymbols::java_lang_IncompatibleClassChangeError(), 4034 "class %s has interface %s as super class", 4035 class_name->as_klass_external_name(), 4036 super_klass->external_name() 4037 ); 4038 return nullHandle; 4039 } 4040 // Make sure super class is not final 4041 if (super_klass->is_final()) { 4042 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 4043 } 4044 } 4045 4046 // save super klass for error handling. 4047 _super_klass = super_klass; 4048 4049 // Compute the transitive list of all unique interfaces implemented by this class 4050 _transitive_interfaces = 4051 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 4052 4053 // sort methods 4054 intArray* method_ordering = sort_methods(methods); 4055 4056 // promote flags from parse_methods() to the klass' flags 4057 access_flags.add_promoted_flags(promoted_flags.as_int()); 4058 4059 // Size of Java vtable (in words) 4060 int vtable_size = 0; 4061 int itable_size = 0; 4062 int num_miranda_methods = 0; 4063 4064 GrowableArray<Method*> all_mirandas(20); 4065 4066 klassVtable::compute_vtable_size_and_num_mirandas( 4067 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods, 4068 access_flags, class_loader, class_name, local_interfaces, 4069 CHECK_(nullHandle)); 4070 4071 // Size of Java itable (in words) 4072 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces); 4073 4074 FieldLayoutInfo info; 4075 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL); 4076 4077 int total_oop_map_size2 = 4078 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count); 4079 4080 // Compute reference type 4081 ReferenceType rt; 4082 if (super_klass() == NULL) { 4083 rt = REF_NONE; 4084 } else { 4085 rt = super_klass->reference_type(); 4086 } 4087 4088 // We can now create the basic Klass* for this klass 4089 _klass = InstanceKlass::allocate_instance_klass(loader_data, 4090 vtable_size, 4091 itable_size, 4092 info.static_field_size, 4093 total_oop_map_size2, 4094 rt, 4095 access_flags, 4096 name, 4097 super_klass(), 4098 !host_klass.is_null(), 4099 CHECK_(nullHandle)); 4100 instanceKlassHandle this_klass (THREAD, _klass); 4101 4102 assert(this_klass->static_field_size() == info.static_field_size, "sanity"); 4103 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count, 4104 "sanity"); 4105 4106 // Fill in information already parsed 4107 this_klass->set_should_verify_class(verify); 4108 jint lh = Klass::instance_layout_helper(info.instance_size, false); 4109 this_klass->set_layout_helper(lh); 4110 assert(this_klass->oop_is_instance(), "layout is correct"); 4111 assert(this_klass->size_helper() == info.instance_size, "correct size_helper"); 4112 // Not yet: supers are done below to support the new subtype-checking fields 4113 //this_klass->set_super(super_klass()); 4114 this_klass->set_class_loader_data(loader_data); 4115 this_klass->set_nonstatic_field_size(info.nonstatic_field_size); 4116 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields); 4117 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]); 4118 4119 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL); 4120 4121 if (has_final_method) { 4122 this_klass->set_has_final_method(); 4123 } 4124 this_klass->copy_method_ordering(method_ordering, CHECK_NULL); 4125 // The InstanceKlass::_methods_jmethod_ids cache 4126 // is managed on the assumption that the initial cache 4127 // size is equal to the number of methods in the class. If 4128 // that changes, then InstanceKlass::idnum_can_increment() 4129 // has to be changed accordingly. 4130 this_klass->set_initial_method_idnum(methods->length()); 4131 this_klass->set_name(cp->klass_name_at(this_class_index)); 4132 if (is_anonymous()) // I am well known to myself 4133 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve 4134 4135 this_klass->set_minor_version(minor_version); 4136 this_klass->set_major_version(major_version); 4137 this_klass->set_has_default_methods(has_default_methods); 4138 this_klass->set_declares_default_methods(declares_default_methods); 4139 4140 if (!host_klass.is_null()) { 4141 assert (this_klass->is_anonymous(), "should be the same"); 4142 this_klass->set_host_klass(host_klass()); 4143 } 4144 4145 // Set up Method*::intrinsic_id as soon as we know the names of methods. 4146 // (We used to do this lazily, but now we query it in Rewriter, 4147 // which is eagerly done for every method, so we might as well do it now, 4148 // when everything is fresh in memory.) 4149 vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(this_klass()); 4150 if (klass_id != vmSymbols::NO_SID) { 4151 for (int j = 0; j < methods->length(); j++) { 4152 Method* method = methods->at(j); 4153 method->init_intrinsic_id(); 4154 4155 if (CheckIntrinsics) { 4156 // Check if an intrinsic is defined for method 'method', 4157 // but the method is not annotated with @HotSpotIntrinsicCandidate. 4158 if (method->intrinsic_id() != vmIntrinsics::_none && 4159 !method->intrinsic_candidate()) { 4160 tty->print("Compiler intrinsic is defined for method [%s], " 4161 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s", 4162 method->name_and_sig_as_C_string(), 4163 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 4164 ); 4165 tty->cr(); 4166 DEBUG_ONLY(vm_exit(1)); 4167 } 4168 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate, 4169 // but there is no intrinsic available for it. 4170 if (method->intrinsic_candidate() && 4171 method->intrinsic_id() == vmIntrinsics::_none) { 4172 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, " 4173 "but no compiler intrinsic is defined for the method.%s", 4174 method->name_and_sig_as_C_string(), 4175 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 4176 ); 4177 tty->cr(); 4178 DEBUG_ONLY(vm_exit(1)); 4179 } 4180 } 4181 } 4182 4183#ifdef ASSERT 4184 if (CheckIntrinsics) { 4185 // Check for orphan methods in the current class. A method m 4186 // of a class C is orphan if an intrinsic is defined for method m, 4187 // but class C does not declare m. 4188 // The check is potentially expensive, therefore it is available 4189 // only in debug builds. 4190 4191 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; id++) { 4192 if (id == vmIntrinsics::_compiledLambdaForm) { 4193 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 4194 // generated for the JVM from a LambdaForm and therefore no method 4195 // is defined for it. 4196 continue; 4197 } 4198 4199 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) { 4200 // Check if the current class contains a method with the same 4201 // name, flags, signature. 4202 bool match = false; 4203 for (int j = 0; j < methods->length(); j++) { 4204 Method* method = methods->at(j); 4205 if (id == method->intrinsic_id()) { 4206 match = true; 4207 break; 4208 } 4209 } 4210 4211 if (!match) { 4212 char buf[1000]; 4213 tty->print("Compiler intrinsic is defined for method [%s], " 4214 "but the method is not available in class [%s].%s", 4215 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), buf, sizeof(buf)), 4216 this_klass->name()->as_C_string(), 4217 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 4218 ); 4219 tty->cr(); 4220 DEBUG_ONLY(vm_exit(1)); 4221 } 4222 } 4223 } 4224 } 4225#endif // ASSERT 4226 } 4227 4228 4229 if (cached_class_file != NULL) { 4230 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes 4231 this_klass->set_cached_class_file(cached_class_file); 4232 } 4233 4234 // Fill in field values obtained by parse_classfile_attributes 4235 if (parsed_annotations.has_any_annotations()) 4236 parsed_annotations.apply_to(this_klass); 4237 apply_parsed_class_attributes(this_klass); 4238 4239 // Miranda methods 4240 if ((num_miranda_methods > 0) || 4241 // if this class introduced new miranda methods or 4242 (super_klass.not_null() && (super_klass->has_miranda_methods())) 4243 // super class exists and this class inherited miranda methods 4244 ) { 4245 this_klass->set_has_miranda_methods(); // then set a flag 4246 } 4247 4248 // Fill in information needed to compute superclasses. 4249 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 4250 4251 // Initialize itable offset tables 4252 klassItable::setup_itable_offset_table(this_klass); 4253 4254 // Compute transitive closure of interfaces this class implements 4255 // Do final class setup 4256 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts); 4257 4258 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 4259 set_precomputed_flags(this_klass); 4260 4261 // reinitialize modifiers, using the InnerClasses attribute 4262 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 4263 this_klass->set_modifier_flags(computed_modifiers); 4264 4265 // check if this class can access its super class 4266 check_super_class_access(this_klass, CHECK_(nullHandle)); 4267 4268 // check if this class can access its superinterfaces 4269 check_super_interface_access(this_klass, CHECK_(nullHandle)); 4270 4271 // check if this class overrides any final method 4272 check_final_method_override(this_klass, CHECK_(nullHandle)); 4273 4274 // check that if this class is an interface then it doesn't have static methods 4275 if (this_klass->is_interface()) { 4276 /* An interface in a JAVA 8 classfile can be static */ 4277 if (_major_version < JAVA_8_VERSION) { 4278 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 4279 } 4280 } 4281 4282 // Allocate mirror and initialize static fields 4283 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain, 4284 CHECK_(nullHandle)); 4285 4286 // Generate any default methods - default methods are interface methods 4287 // that have a default implementation. This is new with Lambda project. 4288 if (has_default_methods ) { 4289 DefaultMethods::generate_default_methods( 4290 this_klass(), &all_mirandas, CHECK_(nullHandle)); 4291 } 4292 4293 // Update the loader_data graph. 4294 record_defined_class_dependencies(this_klass, CHECK_NULL); 4295 4296 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()), 4297 false /* not shared class */); 4298 4299 if (TraceClassLoading) { 4300 ResourceMark rm; 4301 // print in a single call to reduce interleaving of output 4302 if (cfs->source() != NULL) { 4303 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4304 cfs->source()); 4305 } else if (class_loader.is_null()) { 4306 Klass* caller = 4307 THREAD->is_Java_thread() 4308 ? ((JavaThread*)THREAD)->security_get_caller_class(1) 4309 : NULL; 4310 // caller can be NULL, for example, during a JVMTI VM_Init hook 4311 if (caller != NULL) { 4312 tty->print("[Loaded %s by instance of %s]\n", 4313 this_klass->external_name(), 4314 InstanceKlass::cast(caller)->external_name()); 4315 } else { 4316 tty->print("[Loaded %s]\n", this_klass->external_name()); 4317 } 4318 } else { 4319 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4320 InstanceKlass::cast(class_loader->klass())->external_name()); 4321 } 4322 } 4323 4324 if (TraceClassResolution) { 4325 ResourceMark rm; 4326 // print out the superclass. 4327 const char * from = this_klass()->external_name(); 4328 if (this_klass->java_super() != NULL) { 4329 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name()); 4330 } 4331 // print out each of the interface classes referred to by this class. 4332 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4333 if (local_interfaces != NULL) { 4334 int length = local_interfaces->length(); 4335 for (int i = 0; i < length; i++) { 4336 Klass* k = local_interfaces->at(i); 4337 InstanceKlass* to_class = InstanceKlass::cast(k); 4338 const char * to = to_class->external_name(); 4339 tty->print("RESOLVE %s %s (interface)\n", from, to); 4340 } 4341 } 4342 } 4343 4344 // preserve result across HandleMark 4345 preserve_this_klass = this_klass(); 4346 } 4347 4348 // Create new handle outside HandleMark (might be needed for 4349 // Extended Class Redefinition) 4350 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 4351 debug_only(this_klass->verify();) 4352 4353 // Clear class if no error has occurred so destructor doesn't deallocate it 4354 _klass = NULL; 4355 return this_klass; 4356} 4357 4358// Destructor to clean up if there's an error 4359ClassFileParser::~ClassFileParser() { 4360 MetadataFactory::free_metadata(_loader_data, _cp); 4361 MetadataFactory::free_array<u2>(_loader_data, _fields); 4362 4363 // Free methods 4364 InstanceKlass::deallocate_methods(_loader_data, _methods); 4365 4366 // beware of the Universe::empty_blah_array!! 4367 if (_inner_classes != Universe::the_empty_short_array()) { 4368 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 4369 } 4370 4371 // Free interfaces 4372 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(), 4373 _local_interfaces, _transitive_interfaces); 4374 4375 if (_combined_annotations != NULL) { 4376 // After all annotations arrays have been created, they are installed into the 4377 // Annotations object that will be assigned to the InstanceKlass being created. 4378 4379 // Deallocate the Annotations object and the installed annotations arrays. 4380 _combined_annotations->deallocate_contents(_loader_data); 4381 4382 // If the _combined_annotations pointer is non-NULL, 4383 // then the other annotations fields should have been cleared. 4384 assert(_annotations == NULL, "Should have been cleared"); 4385 assert(_type_annotations == NULL, "Should have been cleared"); 4386 assert(_fields_annotations == NULL, "Should have been cleared"); 4387 assert(_fields_type_annotations == NULL, "Should have been cleared"); 4388 } else { 4389 // If the annotations arrays were not installed into the Annotations object, 4390 // then they have to be deallocated explicitly. 4391 MetadataFactory::free_array<u1>(_loader_data, _annotations); 4392 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 4393 Annotations::free_contents(_loader_data, _fields_annotations); 4394 Annotations::free_contents(_loader_data, _fields_type_annotations); 4395 } 4396 4397 clear_class_metadata(); 4398 4399 // deallocate the klass if already created. Don't directly deallocate, but add 4400 // to the deallocate list so that the klass is removed from the CLD::_klasses list 4401 // at a safepoint. 4402 if (_klass != NULL) { 4403 _loader_data->add_to_deallocate_list(_klass); 4404 } 4405 _klass = NULL; 4406} 4407 4408void ClassFileParser::print_field_layout(Symbol* name, 4409 Array<u2>* fields, 4410 constantPoolHandle cp, 4411 int instance_size, 4412 int instance_fields_start, 4413 int instance_fields_end, 4414 int static_fields_end) { 4415 tty->print("%s: field layout\n", name->as_klass_external_name()); 4416 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 4417 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4418 if (!fs.access_flags().is_static()) { 4419 tty->print(" @%3d \"%s\" %s\n", 4420 fs.offset(), 4421 fs.name()->as_klass_external_name(), 4422 fs.signature()->as_klass_external_name()); 4423 } 4424 } 4425 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 4426 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 4427 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 4428 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4429 if (fs.access_flags().is_static()) { 4430 tty->print(" @%3d \"%s\" %s\n", 4431 fs.offset(), 4432 fs.name()->as_klass_external_name(), 4433 fs.signature()->as_klass_external_name()); 4434 } 4435 } 4436 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 4437 tty->print("\n"); 4438} 4439 4440unsigned int 4441ClassFileParser::compute_oop_map_count(instanceKlassHandle super, 4442 unsigned int nonstatic_oop_map_count, 4443 int first_nonstatic_oop_offset) { 4444 unsigned int map_count = 4445 super.is_null() ? 0 : super->nonstatic_oop_map_count(); 4446 if (nonstatic_oop_map_count > 0) { 4447 // We have oops to add to map 4448 if (map_count == 0) { 4449 map_count = nonstatic_oop_map_count; 4450 } else { 4451 // Check whether we should add a new map block or whether the last one can 4452 // be extended 4453 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 4454 OopMapBlock* const last_map = first_map + map_count - 1; 4455 4456 int next_offset = last_map->offset() + last_map->count() * heapOopSize; 4457 if (next_offset == first_nonstatic_oop_offset) { 4458 // There is no gap bettwen superklass's last oop field and first 4459 // local oop field, merge maps. 4460 nonstatic_oop_map_count -= 1; 4461 } else { 4462 // Superklass didn't end with a oop field, add extra maps 4463 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 4464 } 4465 map_count += nonstatic_oop_map_count; 4466 } 4467 } 4468 return map_count; 4469} 4470 4471 4472void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 4473 unsigned int nonstatic_oop_map_count, 4474 int* nonstatic_oop_offsets, 4475 unsigned int* nonstatic_oop_counts) { 4476 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4477 const InstanceKlass* const super = k->superklass(); 4478 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4479 if (super_count > 0) { 4480 // Copy maps from superklass 4481 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4482 for (unsigned int i = 0; i < super_count; ++i) { 4483 *this_oop_map++ = *super_oop_map++; 4484 } 4485 } 4486 4487 if (nonstatic_oop_map_count > 0) { 4488 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4489 // The counts differ because there is no gap between superklass's last oop 4490 // field and the first local oop field. Extend the last oop map copied 4491 // from the superklass instead of creating new one. 4492 nonstatic_oop_map_count--; 4493 nonstatic_oop_offsets++; 4494 this_oop_map--; 4495 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4496 this_oop_map++; 4497 } 4498 4499 // Add new map blocks, fill them 4500 while (nonstatic_oop_map_count-- > 0) { 4501 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4502 this_oop_map->set_count(*nonstatic_oop_counts++); 4503 this_oop_map++; 4504 } 4505 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4506 this_oop_map, "sanity"); 4507 } 4508} 4509 4510 4511void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 4512 Klass* super = k->super(); 4513 4514 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4515 // in which case we don't have to register objects as finalizable 4516 if (!_has_empty_finalizer) { 4517 if (_has_finalizer || 4518 (super != NULL && super->has_finalizer())) { 4519 k->set_has_finalizer(); 4520 } 4521 } 4522 4523#ifdef ASSERT 4524 bool f = false; 4525 Method* m = k->lookup_method(vmSymbols::finalize_method_name(), 4526 vmSymbols::void_method_signature()); 4527 if (m != NULL && !m->is_empty_method()) { 4528 f = true; 4529 } 4530 4531 // Spec doesn't prevent agent from redefinition of empty finalizer. 4532 // Despite the fact that it's generally bad idea and redefined finalizer 4533 // will not work as expected we shouldn't abort vm in this case 4534 if (!k->has_redefined_this_or_super()) { 4535 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 4536 } 4537#endif 4538 4539 // Check if this klass supports the java.lang.Cloneable interface 4540 if (SystemDictionary::Cloneable_klass_loaded()) { 4541 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4542 k->set_is_cloneable(); 4543 } 4544 } 4545 4546 // Check if this klass has a vanilla default constructor 4547 if (super == NULL) { 4548 // java.lang.Object has empty default constructor 4549 k->set_has_vanilla_constructor(); 4550 } else { 4551 if (super->has_vanilla_constructor() && 4552 _has_vanilla_constructor) { 4553 k->set_has_vanilla_constructor(); 4554 } 4555#ifdef ASSERT 4556 bool v = false; 4557 if (super->has_vanilla_constructor()) { 4558 Method* constructor = k->find_method(vmSymbols::object_initializer_name( 4559), vmSymbols::void_method_signature()); 4560 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4561 v = true; 4562 } 4563 } 4564 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4565#endif 4566 } 4567 4568 // If it cannot be fast-path allocated, set a bit in the layout helper. 4569 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4570 assert(k->size_helper() > 0, "layout_helper is initialized"); 4571 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 4572 || k->is_abstract() || k->is_interface() 4573 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL) 4574 || k->size_helper() >= FastAllocateSizeLimit) { 4575 // Forbid fast-path allocation. 4576 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 4577 k->set_layout_helper(lh); 4578 } 4579} 4580 4581// Attach super classes and interface classes to class loader data 4582void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) { 4583 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data(); 4584 if (defining_loader_data->is_the_null_class_loader_data()) { 4585 // Dependencies to null class loader data are implicit. 4586 return; 4587 } else { 4588 // add super class dependency 4589 Klass* super = defined_klass->super(); 4590 if (super != NULL) { 4591 defining_loader_data->record_dependency(super, CHECK); 4592 } 4593 4594 // add super interface dependencies 4595 Array<Klass*>* local_interfaces = defined_klass->local_interfaces(); 4596 if (local_interfaces != NULL) { 4597 int length = local_interfaces->length(); 4598 for (int i = 0; i < length; i++) { 4599 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK); 4600 } 4601 } 4602 } 4603} 4604 4605// utility methods for appending an array with check for duplicates 4606 4607void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) { 4608 // iterate over new interfaces 4609 for (int i = 0; i < ifs->length(); i++) { 4610 Klass* e = ifs->at(i); 4611 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); 4612 // add new interface 4613 result->append_if_missing(e); 4614 } 4615} 4616 4617Array<Klass*>* ClassFileParser::compute_transitive_interfaces( 4618 instanceKlassHandle super, 4619 Array<Klass*>* local_ifs, TRAPS) { 4620 // Compute maximum size for transitive interfaces 4621 int max_transitive_size = 0; 4622 int super_size = 0; 4623 // Add superclass transitive interfaces size 4624 if (super.not_null()) { 4625 super_size = super->transitive_interfaces()->length(); 4626 max_transitive_size += super_size; 4627 } 4628 // Add local interfaces' super interfaces 4629 int local_size = local_ifs->length(); 4630 for (int i = 0; i < local_size; i++) { 4631 Klass* l = local_ifs->at(i); 4632 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); 4633 } 4634 // Finally add local interfaces 4635 max_transitive_size += local_size; 4636 // Construct array 4637 if (max_transitive_size == 0) { 4638 // no interfaces, use canonicalized array 4639 return Universe::the_empty_klass_array(); 4640 } else if (max_transitive_size == super_size) { 4641 // no new local interfaces added, share superklass' transitive interface array 4642 return super->transitive_interfaces(); 4643 } else if (max_transitive_size == local_size) { 4644 // only local interfaces added, share local interface array 4645 return local_ifs; 4646 } else { 4647 ResourceMark rm; 4648 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size); 4649 4650 // Copy down from superclass 4651 if (super.not_null()) { 4652 append_interfaces(result, super->transitive_interfaces()); 4653 } 4654 4655 // Copy down from local interfaces' superinterfaces 4656 for (int i = 0; i < local_ifs->length(); i++) { 4657 Klass* l = local_ifs->at(i); 4658 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); 4659 } 4660 // Finally add local interfaces 4661 append_interfaces(result, local_ifs); 4662 4663 // length will be less than the max_transitive_size if duplicates were removed 4664 int length = result->length(); 4665 assert(length <= max_transitive_size, "just checking"); 4666 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL); 4667 for (int i = 0; i < length; i++) { 4668 Klass* e = result->at(i); 4669 assert(e != NULL, "just checking"); 4670 new_result->at_put(i, e); 4671 } 4672 return new_result; 4673 } 4674} 4675 4676void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 4677 Klass* super = this_klass->super(); 4678 if ((super != NULL) && 4679 (!Reflection::verify_class_access(this_klass(), super, false))) { 4680 ResourceMark rm(THREAD); 4681 Exceptions::fthrow( 4682 THREAD_AND_LOCATION, 4683 vmSymbols::java_lang_IllegalAccessError(), 4684 "class %s cannot access its superclass %s", 4685 this_klass->external_name(), 4686 InstanceKlass::cast(super)->external_name() 4687 ); 4688 return; 4689 } 4690} 4691 4692 4693void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 4694 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4695 int lng = local_interfaces->length(); 4696 for (int i = lng - 1; i >= 0; i--) { 4697 Klass* k = local_interfaces->at(i); 4698 assert (k != NULL && k->is_interface(), "invalid interface"); 4699 if (!Reflection::verify_class_access(this_klass(), k, false)) { 4700 ResourceMark rm(THREAD); 4701 Exceptions::fthrow( 4702 THREAD_AND_LOCATION, 4703 vmSymbols::java_lang_IllegalAccessError(), 4704 "class %s cannot access its superinterface %s", 4705 this_klass->external_name(), 4706 InstanceKlass::cast(k)->external_name() 4707 ); 4708 return; 4709 } 4710 } 4711} 4712 4713 4714void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 4715 Array<Method*>* methods = this_klass->methods(); 4716 int num_methods = methods->length(); 4717 4718 // go thru each method and check if it overrides a final method 4719 for (int index = 0; index < num_methods; index++) { 4720 Method* m = methods->at(index); 4721 4722 // skip private, static, and <init> methods 4723 if ((!m->is_private() && !m->is_static()) && 4724 (m->name() != vmSymbols::object_initializer_name())) { 4725 4726 Symbol* name = m->name(); 4727 Symbol* signature = m->signature(); 4728 Klass* k = this_klass->super(); 4729 Method* super_m = NULL; 4730 while (k != NULL) { 4731 // skip supers that don't have final methods. 4732 if (k->has_final_method()) { 4733 // lookup a matching method in the super class hierarchy 4734 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4735 if (super_m == NULL) { 4736 break; // didn't find any match; get out 4737 } 4738 4739 if (super_m->is_final() && !super_m->is_static() && 4740 // matching method in super is final, and not static 4741 (Reflection::verify_field_access(this_klass(), 4742 super_m->method_holder(), 4743 super_m->method_holder(), 4744 super_m->access_flags(), false)) 4745 // this class can access super final method and therefore override 4746 ) { 4747 ResourceMark rm(THREAD); 4748 Exceptions::fthrow( 4749 THREAD_AND_LOCATION, 4750 vmSymbols::java_lang_VerifyError(), 4751 "class %s overrides final method %s.%s%s", 4752 this_klass->external_name(), 4753 super_m->method_holder()->external_name(), 4754 name->as_C_string(), 4755 signature->as_C_string() 4756 ); 4757 return; 4758 } 4759 4760 // continue to look from super_m's holder's super. 4761 k = super_m->method_holder()->super(); 4762 continue; 4763 } 4764 4765 k = k->super(); 4766 } 4767 } 4768 } 4769} 4770 4771 4772// assumes that this_klass is an interface 4773void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 4774 assert(this_klass->is_interface(), "not an interface"); 4775 Array<Method*>* methods = this_klass->methods(); 4776 int num_methods = methods->length(); 4777 4778 for (int index = 0; index < num_methods; index++) { 4779 Method* m = methods->at(index); 4780 // if m is static and not the init method, throw a verify error 4781 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4782 ResourceMark rm(THREAD); 4783 Exceptions::fthrow( 4784 THREAD_AND_LOCATION, 4785 vmSymbols::java_lang_VerifyError(), 4786 "Illegal static method %s in interface %s", 4787 m->name()->as_C_string(), 4788 this_klass->external_name() 4789 ); 4790 return; 4791 } 4792 } 4793} 4794 4795// utility methods for format checking 4796 4797void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 4798 if (!_need_verify) { return; } 4799 4800 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4801 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4802 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4803 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4804 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4805 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4806 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4807 4808 if ((is_abstract && is_final) || 4809 (is_interface && !is_abstract) || 4810 (is_interface && major_gte_15 && (is_super || is_enum)) || 4811 (!is_interface && major_gte_15 && is_annotation)) { 4812 ResourceMark rm(THREAD); 4813 Exceptions::fthrow( 4814 THREAD_AND_LOCATION, 4815 vmSymbols::java_lang_ClassFormatError(), 4816 "Illegal class modifiers in class %s: 0x%X", 4817 _class_name->as_C_string(), flags 4818 ); 4819 return; 4820 } 4821} 4822 4823bool ClassFileParser::has_illegal_visibility(jint flags) { 4824 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4825 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4826 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4827 4828 return ((is_public && is_protected) || 4829 (is_public && is_private) || 4830 (is_protected && is_private)); 4831} 4832 4833bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 4834 u2 max_version = JAVA_MAX_SUPPORTED_VERSION; 4835 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 4836 (major <= max_version) && 4837 ((major != max_version) || 4838 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 4839} 4840 4841void ClassFileParser::verify_legal_field_modifiers( 4842 jint flags, bool is_interface, TRAPS) { 4843 if (!_need_verify) { return; } 4844 4845 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4846 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4847 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4848 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4849 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4850 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4851 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4852 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4853 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4854 4855 bool is_illegal = false; 4856 4857 if (is_interface) { 4858 if (!is_public || !is_static || !is_final || is_private || 4859 is_protected || is_volatile || is_transient || 4860 (major_gte_15 && is_enum)) { 4861 is_illegal = true; 4862 } 4863 } else { // not interface 4864 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4865 is_illegal = true; 4866 } 4867 } 4868 4869 if (is_illegal) { 4870 ResourceMark rm(THREAD); 4871 Exceptions::fthrow( 4872 THREAD_AND_LOCATION, 4873 vmSymbols::java_lang_ClassFormatError(), 4874 "Illegal field modifiers in class %s: 0x%X", 4875 _class_name->as_C_string(), flags); 4876 return; 4877 } 4878} 4879 4880void ClassFileParser::verify_legal_method_modifiers( 4881 jint flags, bool is_interface, Symbol* name, TRAPS) { 4882 if (!_need_verify) { return; } 4883 4884 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4885 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4886 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4887 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4888 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4889 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4890 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4891 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4892 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4893 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4894 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4895 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4896 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4897 4898 bool is_illegal = false; 4899 4900 if (is_interface) { 4901 if (major_gte_8) { 4902 // Class file version is JAVA_8_VERSION or later Methods of 4903 // interfaces may set any of the flags except ACC_PROTECTED, 4904 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4905 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4906 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4907 (is_native || is_protected || is_final || is_synchronized) || 4908 // If a specific method of a class or interface has its 4909 // ACC_ABSTRACT flag set, it must not have any of its 4910 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4911 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4912 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4913 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4914 (is_abstract && (is_private || is_static || is_strict))) { 4915 is_illegal = true; 4916 } 4917 } else if (major_gte_15) { 4918 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4919 if (!is_public || is_static || is_final || is_synchronized || 4920 is_native || !is_abstract || is_strict) { 4921 is_illegal = true; 4922 } 4923 } else { 4924 // Class file version is pre-JAVA_1_5_VERSION 4925 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4926 is_illegal = true; 4927 } 4928 } 4929 } else { // not interface 4930 if (has_illegal_visibility(flags)) { 4931 is_illegal = true; 4932 } else { 4933 if (is_initializer) { 4934 if (is_static || is_final || is_synchronized || is_native || 4935 is_abstract || (major_gte_15 && is_bridge)) { 4936 is_illegal = true; 4937 } 4938 } else { // not initializer 4939 if (is_abstract) { 4940 if ((is_final || is_native || is_private || is_static || 4941 (major_gte_15 && (is_synchronized || is_strict)))) { 4942 is_illegal = true; 4943 } 4944 } 4945 } 4946 } 4947 } 4948 4949 if (is_illegal) { 4950 ResourceMark rm(THREAD); 4951 Exceptions::fthrow( 4952 THREAD_AND_LOCATION, 4953 vmSymbols::java_lang_ClassFormatError(), 4954 "Method %s in class %s has illegal modifiers: 0x%X", 4955 name->as_C_string(), _class_name->as_C_string(), flags); 4956 return; 4957 } 4958} 4959 4960void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 4961 assert(_need_verify, "only called when _need_verify is true"); 4962 int i = 0; 4963 int count = length >> 2; 4964 for (int k=0; k<count; k++) { 4965 unsigned char b0 = buffer[i]; 4966 unsigned char b1 = buffer[i+1]; 4967 unsigned char b2 = buffer[i+2]; 4968 unsigned char b3 = buffer[i+3]; 4969 // For an unsigned char v, 4970 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 4971 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 4972 unsigned char res = b0 | b0 - 1 | 4973 b1 | b1 - 1 | 4974 b2 | b2 - 1 | 4975 b3 | b3 - 1; 4976 if (res >= 128) break; 4977 i += 4; 4978 } 4979 for(; i < length; i++) { 4980 unsigned short c; 4981 // no embedded zeros 4982 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 4983 if(buffer[i] < 128) { 4984 continue; 4985 } 4986 if ((i + 5) < length) { // see if it's legal supplementary character 4987 if (UTF8::is_supplementary_character(&buffer[i])) { 4988 c = UTF8::get_supplementary_character(&buffer[i]); 4989 i += 5; 4990 continue; 4991 } 4992 } 4993 switch (buffer[i] >> 4) { 4994 default: break; 4995 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 4996 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4997 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 4998 c = (buffer[i] & 0x1F) << 6; 4999 i++; 5000 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 5001 c += buffer[i] & 0x3F; 5002 if (_major_version <= 47 || c == 0 || c >= 0x80) { 5003 // for classes with major > 47, c must a null or a character in its shortest form 5004 break; 5005 } 5006 } 5007 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 5008 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 5009 c = (buffer[i] & 0xF) << 12; 5010 i += 2; 5011 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 5012 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 5013 if (_major_version <= 47 || c >= 0x800) { 5014 // for classes with major > 47, c must be in its shortest form 5015 break; 5016 } 5017 } 5018 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 5019 } // end of switch 5020 } // end of for 5021} 5022 5023// Checks if name is a legal class name. 5024void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) { 5025 if (!_need_verify || _relax_verify) { return; } 5026 5027 char buf[fixed_buffer_size]; 5028 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5029 unsigned int length = name->utf8_length(); 5030 bool legal = false; 5031 5032 if (length > 0) { 5033 char* p; 5034 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 5035 p = skip_over_field_signature(bytes, false, length, CHECK); 5036 legal = (p != NULL) && ((p - bytes) == (int)length); 5037 } else if (_major_version < JAVA_1_5_VERSION) { 5038 if (bytes[0] != '<') { 5039 p = skip_over_field_name(bytes, true, length); 5040 legal = (p != NULL) && ((p - bytes) == (int)length); 5041 } 5042 } else { 5043 // 4900761: relax the constraints based on JSR202 spec 5044 // Class names may be drawn from the entire Unicode character set. 5045 // Identifiers between '/' must be unqualified names. 5046 // The utf8 string has been verified when parsing cpool entries. 5047 legal = verify_unqualified_name(bytes, length, LegalClass); 5048 } 5049 } 5050 if (!legal) { 5051 ResourceMark rm(THREAD); 5052 Exceptions::fthrow( 5053 THREAD_AND_LOCATION, 5054 vmSymbols::java_lang_ClassFormatError(), 5055 "Illegal class name \"%s\" in class file %s", bytes, 5056 _class_name->as_C_string() 5057 ); 5058 return; 5059 } 5060} 5061 5062// Checks if name is a legal field name. 5063void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) { 5064 if (!_need_verify || _relax_verify) { return; } 5065 5066 char buf[fixed_buffer_size]; 5067 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5068 unsigned int length = name->utf8_length(); 5069 bool legal = false; 5070 5071 if (length > 0) { 5072 if (_major_version < JAVA_1_5_VERSION) { 5073 if (bytes[0] != '<') { 5074 char* p = skip_over_field_name(bytes, false, length); 5075 legal = (p != NULL) && ((p - bytes) == (int)length); 5076 } 5077 } else { 5078 // 4881221: relax the constraints based on JSR202 spec 5079 legal = verify_unqualified_name(bytes, length, LegalField); 5080 } 5081 } 5082 5083 if (!legal) { 5084 ResourceMark rm(THREAD); 5085 Exceptions::fthrow( 5086 THREAD_AND_LOCATION, 5087 vmSymbols::java_lang_ClassFormatError(), 5088 "Illegal field name \"%s\" in class %s", bytes, 5089 _class_name->as_C_string() 5090 ); 5091 return; 5092 } 5093} 5094 5095// Checks if name is a legal method name. 5096void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) { 5097 if (!_need_verify || _relax_verify) { return; } 5098 5099 assert(name != NULL, "method name is null"); 5100 char buf[fixed_buffer_size]; 5101 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5102 unsigned int length = name->utf8_length(); 5103 bool legal = false; 5104 5105 if (length > 0) { 5106 if (bytes[0] == '<') { 5107 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5108 legal = true; 5109 } 5110 } else if (_major_version < JAVA_1_5_VERSION) { 5111 char* p; 5112 p = skip_over_field_name(bytes, false, length); 5113 legal = (p != NULL) && ((p - bytes) == (int)length); 5114 } else { 5115 // 4881221: relax the constraints based on JSR202 spec 5116 legal = verify_unqualified_name(bytes, length, LegalMethod); 5117 } 5118 } 5119 5120 if (!legal) { 5121 ResourceMark rm(THREAD); 5122 Exceptions::fthrow( 5123 THREAD_AND_LOCATION, 5124 vmSymbols::java_lang_ClassFormatError(), 5125 "Illegal method name \"%s\" in class %s", bytes, 5126 _class_name->as_C_string() 5127 ); 5128 return; 5129 } 5130} 5131 5132 5133// Checks if signature is a legal field signature. 5134void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) { 5135 if (!_need_verify) { return; } 5136 5137 char buf[fixed_buffer_size]; 5138 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5139 unsigned int length = signature->utf8_length(); 5140 char* p = skip_over_field_signature(bytes, false, length, CHECK); 5141 5142 if (p == NULL || (p - bytes) != (int)length) { 5143 throwIllegalSignature("Field", name, signature, CHECK); 5144 } 5145} 5146 5147// Checks if signature is a legal method signature. 5148// Returns number of parameters 5149int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) { 5150 if (!_need_verify) { 5151 // make sure caller's args_size will be less than 0 even for non-static 5152 // method so it will be recomputed in compute_size_of_parameters(). 5153 return -2; 5154 } 5155 5156 unsigned int args_size = 0; 5157 char buf[fixed_buffer_size]; 5158 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5159 unsigned int length = signature->utf8_length(); 5160 char* nextp; 5161 5162 // The first character must be a '(' 5163 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5164 length--; 5165 // Skip over legal field signatures 5166 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5167 while ((length > 0) && (nextp != NULL)) { 5168 args_size++; 5169 if (p[0] == 'J' || p[0] == 'D') { 5170 args_size++; 5171 } 5172 length -= nextp - p; 5173 p = nextp; 5174 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5175 } 5176 // The first non-signature thing better be a ')' 5177 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5178 length--; 5179 if (name == vmSymbols::object_initializer_name()) { 5180 // All "<init>" methods must return void 5181 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5182 return args_size; 5183 } 5184 } else { 5185 // Now we better just have a return value 5186 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5187 if (nextp && ((int)length == (nextp - p))) { 5188 return args_size; 5189 } 5190 } 5191 } 5192 } 5193 // Report error 5194 throwIllegalSignature("Method", name, signature, CHECK_0); 5195 return 0; 5196} 5197 5198 5199// Unqualified names may not contain the characters '.', ';', '[', or '/'. 5200// Method names also may not contain the characters '<' or '>', unless <init> 5201// or <clinit>. Note that method names may not be <init> or <clinit> in this 5202// method. Because these names have been checked as special cases before 5203// calling this method in verify_legal_method_name. 5204bool ClassFileParser::verify_unqualified_name( 5205 char* name, unsigned int length, int type) { 5206 jchar ch; 5207 5208 for (char* p = name; p != name + length; ) { 5209 ch = *p; 5210 if (ch < 128) { 5211 p++; 5212 if (ch == '.' || ch == ';' || ch == '[' ) { 5213 return false; // do not permit '.', ';', or '[' 5214 } 5215 if (type != LegalClass && ch == '/') { 5216 return false; // do not permit '/' unless it's class name 5217 } 5218 if (type == LegalMethod && (ch == '<' || ch == '>')) { 5219 return false; // do not permit '<' or '>' in method names 5220 } 5221 } else { 5222 char* tmp_p = UTF8::next(p, &ch); 5223 p = tmp_p; 5224 } 5225 } 5226 return true; 5227} 5228 5229 5230// Take pointer to a string. Skip over the longest part of the string that could 5231// be taken as a fieldname. Allow '/' if slash_ok is true. 5232// Return a pointer to just past the fieldname. 5233// Return NULL if no fieldname at all was found, or in the case of slash_ok 5234// being true, we saw consecutive slashes (meaning we were looking for a 5235// qualified path but found something that was badly-formed). 5236char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 5237 char* p; 5238 jchar ch; 5239 jboolean last_is_slash = false; 5240 jboolean not_first_ch = false; 5241 5242 for (p = name; p != name + length; not_first_ch = true) { 5243 char* old_p = p; 5244 ch = *p; 5245 if (ch < 128) { 5246 p++; 5247 // quick check for ascii 5248 if ((ch >= 'a' && ch <= 'z') || 5249 (ch >= 'A' && ch <= 'Z') || 5250 (ch == '_' || ch == '$') || 5251 (not_first_ch && ch >= '0' && ch <= '9')) { 5252 last_is_slash = false; 5253 continue; 5254 } 5255 if (slash_ok && ch == '/') { 5256 if (last_is_slash) { 5257 return NULL; // Don't permit consecutive slashes 5258 } 5259 last_is_slash = true; 5260 continue; 5261 } 5262 } else { 5263 jint unicode_ch; 5264 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5265 p = tmp_p; 5266 last_is_slash = false; 5267 // Check if ch is Java identifier start or is Java identifier part 5268 // 4672820: call java.lang.Character methods directly without generating separate tables. 5269 EXCEPTION_MARK; 5270 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass()); 5271 5272 // return value 5273 JavaValue result(T_BOOLEAN); 5274 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 5275 JavaCallArguments args; 5276 args.push_int(unicode_ch); 5277 5278 // public static boolean isJavaIdentifierStart(char ch); 5279 JavaCalls::call_static(&result, 5280 klass, 5281 vmSymbols::isJavaIdentifierStart_name(), 5282 vmSymbols::int_bool_signature(), 5283 &args, 5284 THREAD); 5285 5286 if (HAS_PENDING_EXCEPTION) { 5287 CLEAR_PENDING_EXCEPTION; 5288 return 0; 5289 } 5290 if (result.get_jboolean()) { 5291 continue; 5292 } 5293 5294 if (not_first_ch) { 5295 // public static boolean isJavaIdentifierPart(char ch); 5296 JavaCalls::call_static(&result, 5297 klass, 5298 vmSymbols::isJavaIdentifierPart_name(), 5299 vmSymbols::int_bool_signature(), 5300 &args, 5301 THREAD); 5302 5303 if (HAS_PENDING_EXCEPTION) { 5304 CLEAR_PENDING_EXCEPTION; 5305 return 0; 5306 } 5307 5308 if (result.get_jboolean()) { 5309 continue; 5310 } 5311 } 5312 } 5313 return (not_first_ch) ? old_p : NULL; 5314 } 5315 return (not_first_ch) ? p : NULL; 5316} 5317 5318 5319// Take pointer to a string. Skip over the longest part of the string that could 5320// be taken as a field signature. Allow "void" if void_ok. 5321// Return a pointer to just past the signature. 5322// Return NULL if no legal signature is found. 5323char* ClassFileParser::skip_over_field_signature(char* signature, 5324 bool void_ok, 5325 unsigned int length, 5326 TRAPS) { 5327 unsigned int array_dim = 0; 5328 while (length > 0) { 5329 switch (signature[0]) { 5330 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5331 case JVM_SIGNATURE_BOOLEAN: 5332 case JVM_SIGNATURE_BYTE: 5333 case JVM_SIGNATURE_CHAR: 5334 case JVM_SIGNATURE_SHORT: 5335 case JVM_SIGNATURE_INT: 5336 case JVM_SIGNATURE_FLOAT: 5337 case JVM_SIGNATURE_LONG: 5338 case JVM_SIGNATURE_DOUBLE: 5339 return signature + 1; 5340 case JVM_SIGNATURE_CLASS: { 5341 if (_major_version < JAVA_1_5_VERSION) { 5342 // Skip over the class name if one is there 5343 char* p = skip_over_field_name(signature + 1, true, --length); 5344 5345 // The next character better be a semicolon 5346 if (p && (p - signature) > 1 && p[0] == ';') { 5347 return p + 1; 5348 } 5349 } else { 5350 // 4900761: For class version > 48, any unicode is allowed in class name. 5351 length--; 5352 signature++; 5353 while (length > 0 && signature[0] != ';') { 5354 if (signature[0] == '.') { 5355 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 5356 } 5357 length--; 5358 signature++; 5359 } 5360 if (signature[0] == ';') { return signature + 1; } 5361 } 5362 5363 return NULL; 5364 } 5365 case JVM_SIGNATURE_ARRAY: 5366 array_dim++; 5367 if (array_dim > 255) { 5368 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5369 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5370 } 5371 // The rest of what's there better be a legal signature 5372 signature++; 5373 length--; 5374 void_ok = false; 5375 break; 5376 5377 default: 5378 return NULL; 5379 } 5380 } 5381 return NULL; 5382} 5383