1 /* 2 * Copyright (c) 1997, 2010, 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/javaClasses.hpp" 29 #include "classfile/symbolTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/verificationType.hpp" 32 #include "classfile/verifier.hpp" 33 #include "classfile/vmSymbols.hpp" 34 #include "memory/allocation.hpp" 35 #include "memory/gcLocker.hpp" 36 #include "memory/oopFactory.hpp" 37 #include "memory/universe.inline.hpp" 38 #include "oops/constantPoolOop.hpp" 39 #include "oops/instanceKlass.hpp" 40 #include "oops/klass.inline.hpp" 41 #include "oops/klassOop.hpp" 42 #include "oops/klassVtable.hpp" 43 #include "oops/methodOop.hpp" 44 #include "oops/symbol.hpp" 45 #include "prims/jvmtiExport.hpp" 46 #include "runtime/javaCalls.hpp" 47 #include "runtime/perfData.hpp" 48 #include "runtime/reflection.hpp" 49 #include "runtime/signature.hpp" 50 #include "runtime/timer.hpp" 51 #include "services/classLoadingService.hpp" 52 #include "services/threadService.hpp" 53 54 // We generally try to create the oops directly when parsing, rather than 55 // allocating temporary data structures and copying the bytes twice. A 56 // temporary area is only needed when parsing utf8 entries in the constant 57 // pool and when parsing line number tables. 58 59 // We add assert in debug mode when class format is not checked. 60 61 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 62 #define JAVA_MIN_SUPPORTED_VERSION 45 63 #define JAVA_MAX_SUPPORTED_VERSION 51 64 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 65 66 // Used for two backward compatibility reasons: 67 // - to check for new additions to the class file format in JDK1.5 68 // - to check for bug fixes in the format checker in JDK1.5 69 #define JAVA_1_5_VERSION 49 70 71 // Used for backward compatibility reasons: 72 // - to check for javac bug fixes that happened after 1.5 73 // - also used as the max version when running in jdk6 74 #define JAVA_6_VERSION 50 75 76 // Used for backward compatibility reasons: 77 // - to check NameAndType_info signatures more aggressively 78 #define JAVA_7_VERSION 51 79 80 81 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) { 82 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 83 // this function (_current can be allocated in a register, with scalar 84 // replacement of aggregates). The _current pointer is copied back to 85 // stream() when this function returns. DON'T call another method within 86 // this method that uses stream(). 87 ClassFileStream* cfs0 = stream(); 88 ClassFileStream cfs1 = *cfs0; 89 ClassFileStream* cfs = &cfs1; 90 #ifdef ASSERT 91 assert(cfs->allocated_on_stack(),"should be local"); 92 u1* old_current = cfs0->current(); 93 #endif 94 95 // Used for batching symbol allocations. 96 const char* names[SymbolTable::symbol_alloc_batch_size]; 97 int lengths[SymbolTable::symbol_alloc_batch_size]; 98 int indices[SymbolTable::symbol_alloc_batch_size]; 99 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 100 int names_count = 0; 101 102 // parsing Index 0 is unused 103 for (int index = 1; index < length; index++) { 104 // Each of the following case guarantees one more byte in the stream 105 // for the following tag or the access_flags following constant pool, 106 // so we don't need bounds-check for reading tag. 107 u1 tag = cfs->get_u1_fast(); 108 switch (tag) { 109 case JVM_CONSTANT_Class : 110 { 111 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 112 u2 name_index = cfs->get_u2_fast(); 113 cp->klass_index_at_put(index, name_index); 114 } 115 break; 116 case JVM_CONSTANT_Fieldref : 117 { 118 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 119 u2 class_index = cfs->get_u2_fast(); 120 u2 name_and_type_index = cfs->get_u2_fast(); 121 cp->field_at_put(index, class_index, name_and_type_index); 122 } 123 break; 124 case JVM_CONSTANT_Methodref : 125 { 126 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 127 u2 class_index = cfs->get_u2_fast(); 128 u2 name_and_type_index = cfs->get_u2_fast(); 129 cp->method_at_put(index, class_index, name_and_type_index); 130 } 131 break; 132 case JVM_CONSTANT_InterfaceMethodref : 133 { 134 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 135 u2 class_index = cfs->get_u2_fast(); 136 u2 name_and_type_index = cfs->get_u2_fast(); 137 cp->interface_method_at_put(index, class_index, name_and_type_index); 138 } 139 break; 140 case JVM_CONSTANT_String : 141 { 142 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 143 u2 string_index = cfs->get_u2_fast(); 144 cp->string_index_at_put(index, string_index); 145 } 146 break; 147 case JVM_CONSTANT_MethodHandle : 148 case JVM_CONSTANT_MethodType : 149 if (!EnableMethodHandles || 150 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 151 classfile_parse_error( 152 (!EnableMethodHandles ? 153 "This JVM does not support constant tag %u in class file %s" : 154 "Class file version does not support constant tag %u in class file %s"), 155 tag, CHECK); 156 } 157 if (tag == JVM_CONSTANT_MethodHandle) { 158 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 159 u1 ref_kind = cfs->get_u1_fast(); 160 u2 method_index = cfs->get_u2_fast(); 161 cp->method_handle_index_at_put(index, ref_kind, method_index); 162 } else if (tag == JVM_CONSTANT_MethodType) { 163 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 164 u2 signature_index = cfs->get_u2_fast(); 165 cp->method_type_index_at_put(index, signature_index); 166 } else { 167 ShouldNotReachHere(); 168 } 169 break; 170 case JVM_CONSTANT_InvokeDynamicTrans : // this tag appears only in old classfiles 171 case JVM_CONSTANT_InvokeDynamic : 172 { 173 if (!EnableInvokeDynamic || 174 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 175 classfile_parse_error( 176 (!EnableInvokeDynamic ? 177 "This JVM does not support constant tag %u in class file %s" : 178 "Class file version does not support constant tag %u in class file %s"), 179 tag, CHECK); 180 } 181 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 182 u2 bootstrap_specifier_index = cfs->get_u2_fast(); 183 u2 name_and_type_index = cfs->get_u2_fast(); 184 if (tag == JVM_CONSTANT_InvokeDynamicTrans) { 185 if (!AllowTransitionalJSR292) 186 classfile_parse_error( 187 "This JVM does not support transitional InvokeDynamic tag %u in class file %s", 188 tag, CHECK); 189 cp->invoke_dynamic_trans_at_put(index, bootstrap_specifier_index, name_and_type_index); 190 break; 191 } 192 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) 193 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 194 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 195 } 196 break; 197 case JVM_CONSTANT_Integer : 198 { 199 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 200 u4 bytes = cfs->get_u4_fast(); 201 cp->int_at_put(index, (jint) bytes); 202 } 203 break; 204 case JVM_CONSTANT_Float : 205 { 206 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 207 u4 bytes = cfs->get_u4_fast(); 208 cp->float_at_put(index, *(jfloat*)&bytes); 209 } 210 break; 211 case JVM_CONSTANT_Long : 212 // A mangled type might cause you to overrun allocated memory 213 guarantee_property(index+1 < length, 214 "Invalid constant pool entry %u in class file %s", 215 index, CHECK); 216 { 217 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 218 u8 bytes = cfs->get_u8_fast(); 219 cp->long_at_put(index, bytes); 220 } 221 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 222 break; 223 case JVM_CONSTANT_Double : 224 // A mangled type might cause you to overrun allocated memory 225 guarantee_property(index+1 < length, 226 "Invalid constant pool entry %u in class file %s", 227 index, CHECK); 228 { 229 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 230 u8 bytes = cfs->get_u8_fast(); 231 cp->double_at_put(index, *(jdouble*)&bytes); 232 } 233 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 234 break; 235 case JVM_CONSTANT_NameAndType : 236 { 237 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 238 u2 name_index = cfs->get_u2_fast(); 239 u2 signature_index = cfs->get_u2_fast(); 240 cp->name_and_type_at_put(index, name_index, signature_index); 241 } 242 break; 243 case JVM_CONSTANT_Utf8 : 244 { 245 cfs->guarantee_more(2, CHECK); // utf8_length 246 u2 utf8_length = cfs->get_u2_fast(); 247 u1* utf8_buffer = cfs->get_u1_buffer(); 248 assert(utf8_buffer != NULL, "null utf8 buffer"); 249 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 250 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 251 cfs->skip_u1_fast(utf8_length); 252 253 // Before storing the symbol, make sure it's legal 254 if (_need_verify) { 255 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); 256 } 257 258 if (AnonymousClasses && has_cp_patch_at(index)) { 259 Handle patch = clear_cp_patch_at(index); 260 guarantee_property(java_lang_String::is_instance(patch()), 261 "Illegal utf8 patch at %d in class file %s", 262 index, CHECK); 263 char* str = java_lang_String::as_utf8_string(patch()); 264 // (could use java_lang_String::as_symbol instead, but might as well batch them) 265 utf8_buffer = (u1*) str; 266 utf8_length = (int) strlen(str); 267 } 268 269 unsigned int hash; 270 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); 271 if (result == NULL) { 272 names[names_count] = (char*)utf8_buffer; 273 lengths[names_count] = utf8_length; 274 indices[names_count] = index; 275 hashValues[names_count++] = hash; 276 if (names_count == SymbolTable::symbol_alloc_batch_size) { 277 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK); 278 names_count = 0; 279 } 280 } else { 281 cp->symbol_at_put(index, result); 282 } 283 } 284 break; 285 default: 286 classfile_parse_error( 287 "Unknown constant tag %u in class file %s", tag, CHECK); 288 break; 289 } 290 } 291 292 // Allocate the remaining symbols 293 if (names_count > 0) { 294 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK); 295 } 296 297 // Copy _current pointer of local copy back to stream(). 298 #ifdef ASSERT 299 assert(cfs0->current() == old_current, "non-exclusive use of stream()"); 300 #endif 301 cfs0->set_current(cfs1.current()); 302 } 303 304 // This class unreferences constant pool symbols if an error has occurred 305 // while parsing the class before it is assigned into the class. 306 // If it gets an error after that it is unloaded and the constant pool will 307 // be cleaned up then. 308 class ConstantPoolCleaner : public StackObj { 309 constantPoolHandle _cphandle; 310 bool _in_error; 311 public: 312 ConstantPoolCleaner(constantPoolHandle cp) : _cphandle(cp), _in_error(true) {} 313 ~ConstantPoolCleaner() { 314 if (_in_error && _cphandle.not_null()) { 315 _cphandle->unreference_symbols(); 316 } 317 } 318 void set_in_error(bool clean) { _in_error = clean; } 319 }; 320 321 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } 322 323 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { 324 ClassFileStream* cfs = stream(); 325 constantPoolHandle nullHandle; 326 327 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag 328 u2 length = cfs->get_u2_fast(); 329 guarantee_property( 330 length >= 1, "Illegal constant pool size %u in class file %s", 331 length, CHECK_(nullHandle)); 332 constantPoolOop constant_pool = 333 oopFactory::new_constantPool(length, 334 oopDesc::IsSafeConc, 335 CHECK_(nullHandle)); 336 constantPoolHandle cp (THREAD, constant_pool); 337 338 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops 339 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up. 340 341 // parsing constant pool entries 342 parse_constant_pool_entries(cp, length, CHECK_(nullHandle)); 343 344 int index = 1; // declared outside of loops for portability 345 346 // first verification pass - validate cross references and fixup class and string constants 347 for (index = 1; index < length; index++) { // Index 0 is unused 348 jbyte tag = cp->tag_at(index).value(); 349 switch (tag) { 350 case JVM_CONSTANT_Class : 351 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 352 break; 353 case JVM_CONSTANT_Fieldref : 354 // fall through 355 case JVM_CONSTANT_Methodref : 356 // fall through 357 case JVM_CONSTANT_InterfaceMethodref : { 358 if (!_need_verify) break; 359 int klass_ref_index = cp->klass_ref_index_at(index); 360 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 361 check_property(valid_cp_range(klass_ref_index, length) && 362 is_klass_reference(cp, klass_ref_index), 363 "Invalid constant pool index %u in class file %s", 364 klass_ref_index, 365 CHECK_(nullHandle)); 366 check_property(valid_cp_range(name_and_type_ref_index, length) && 367 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 368 "Invalid constant pool index %u in class file %s", 369 name_and_type_ref_index, 370 CHECK_(nullHandle)); 371 break; 372 } 373 case JVM_CONSTANT_String : 374 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 375 break; 376 case JVM_CONSTANT_Integer : 377 break; 378 case JVM_CONSTANT_Float : 379 break; 380 case JVM_CONSTANT_Long : 381 case JVM_CONSTANT_Double : 382 index++; 383 check_property( 384 (index < length && cp->tag_at(index).is_invalid()), 385 "Improper constant pool long/double index %u in class file %s", 386 index, CHECK_(nullHandle)); 387 break; 388 case JVM_CONSTANT_NameAndType : { 389 if (!_need_verify) break; 390 int name_ref_index = cp->name_ref_index_at(index); 391 int signature_ref_index = cp->signature_ref_index_at(index); 392 check_property( 393 valid_cp_range(name_ref_index, length) && 394 cp->tag_at(name_ref_index).is_utf8(), 395 "Invalid constant pool index %u in class file %s", 396 name_ref_index, CHECK_(nullHandle)); 397 check_property( 398 valid_cp_range(signature_ref_index, length) && 399 cp->tag_at(signature_ref_index).is_utf8(), 400 "Invalid constant pool index %u in class file %s", 401 signature_ref_index, CHECK_(nullHandle)); 402 break; 403 } 404 case JVM_CONSTANT_Utf8 : 405 break; 406 case JVM_CONSTANT_UnresolvedClass : // fall-through 407 case JVM_CONSTANT_UnresolvedClassInError: 408 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 409 break; 410 case JVM_CONSTANT_ClassIndex : 411 { 412 int class_index = cp->klass_index_at(index); 413 check_property( 414 valid_cp_range(class_index, length) && 415 cp->tag_at(class_index).is_utf8(), 416 "Invalid constant pool index %u in class file %s", 417 class_index, CHECK_(nullHandle)); 418 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 419 } 420 break; 421 case JVM_CONSTANT_UnresolvedString : 422 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 423 break; 424 case JVM_CONSTANT_StringIndex : 425 { 426 int string_index = cp->string_index_at(index); 427 check_property( 428 valid_cp_range(string_index, length) && 429 cp->tag_at(string_index).is_utf8(), 430 "Invalid constant pool index %u in class file %s", 431 string_index, CHECK_(nullHandle)); 432 Symbol* sym = cp->symbol_at(string_index); 433 cp->unresolved_string_at_put(index, sym); 434 } 435 break; 436 case JVM_CONSTANT_MethodHandle : 437 { 438 int ref_index = cp->method_handle_index_at(index); 439 check_property( 440 valid_cp_range(ref_index, length) && 441 EnableMethodHandles, 442 "Invalid constant pool index %u in class file %s", 443 ref_index, CHECK_(nullHandle)); 444 constantTag tag = cp->tag_at(ref_index); 445 int ref_kind = cp->method_handle_ref_kind_at(index); 446 switch (ref_kind) { 447 case JVM_REF_getField: 448 case JVM_REF_getStatic: 449 case JVM_REF_putField: 450 case JVM_REF_putStatic: 451 check_property( 452 tag.is_field(), 453 "Invalid constant pool index %u in class file %s (not a field)", 454 ref_index, CHECK_(nullHandle)); 455 break; 456 case JVM_REF_invokeVirtual: 457 case JVM_REF_invokeStatic: 458 case JVM_REF_invokeSpecial: 459 case JVM_REF_newInvokeSpecial: 460 check_property( 461 tag.is_method(), 462 "Invalid constant pool index %u in class file %s (not a method)", 463 ref_index, CHECK_(nullHandle)); 464 break; 465 case JVM_REF_invokeInterface: 466 check_property( 467 tag.is_interface_method(), 468 "Invalid constant pool index %u in class file %s (not an interface method)", 469 ref_index, CHECK_(nullHandle)); 470 break; 471 default: 472 classfile_parse_error( 473 "Bad method handle kind at constant pool index %u in class file %s", 474 index, CHECK_(nullHandle)); 475 } 476 // Keep the ref_index unchanged. It will be indirected at link-time. 477 } 478 break; 479 case JVM_CONSTANT_MethodType : 480 { 481 int ref_index = cp->method_type_index_at(index); 482 check_property( 483 valid_cp_range(ref_index, length) && 484 cp->tag_at(ref_index).is_utf8() && 485 EnableMethodHandles, 486 "Invalid constant pool index %u in class file %s", 487 ref_index, CHECK_(nullHandle)); 488 } 489 break; 490 case JVM_CONSTANT_InvokeDynamicTrans : 491 case JVM_CONSTANT_InvokeDynamic : 492 { 493 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index); 494 check_property(valid_cp_range(name_and_type_ref_index, length) && 495 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 496 "Invalid constant pool index %u in class file %s", 497 name_and_type_ref_index, 498 CHECK_(nullHandle)); 499 if (tag == JVM_CONSTANT_InvokeDynamicTrans) { 500 int bootstrap_method_ref_index = cp->invoke_dynamic_bootstrap_method_ref_index_at(index); 501 check_property(valid_cp_range(bootstrap_method_ref_index, length) && 502 cp->tag_at(bootstrap_method_ref_index).is_method_handle(), 503 "Invalid constant pool index %u in class file %s", 504 bootstrap_method_ref_index, 505 CHECK_(nullHandle)); 506 } 507 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available 508 break; 509 } 510 default: 511 fatal(err_msg("bad constant pool tag value %u", 512 cp->tag_at(index).value())); 513 ShouldNotReachHere(); 514 break; 515 } // end of switch 516 } // end of for 517 518 if (_cp_patches != NULL) { 519 // need to treat this_class specially... 520 assert(AnonymousClasses, ""); 521 int this_class_index; 522 { 523 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 524 u1* mark = cfs->current(); 525 u2 flags = cfs->get_u2_fast(); 526 this_class_index = cfs->get_u2_fast(); 527 cfs->set_current(mark); // revert to mark 528 } 529 530 for (index = 1; index < length; index++) { // Index 0 is unused 531 if (has_cp_patch_at(index)) { 532 guarantee_property(index != this_class_index, 533 "Illegal constant pool patch to self at %d in class file %s", 534 index, CHECK_(nullHandle)); 535 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); 536 } 537 } 538 // Ensure that all the patches have been used. 539 for (index = 0; index < _cp_patches->length(); index++) { 540 guarantee_property(!has_cp_patch_at(index), 541 "Unused constant pool patch at %d in class file %s", 542 index, CHECK_(nullHandle)); 543 } 544 } 545 546 if (!_need_verify) { 547 cp_in_error.set_in_error(false); 548 return cp; 549 } 550 551 // second verification pass - checks the strings are of the right format. 552 // but not yet to the other entries 553 for (index = 1; index < length; index++) { 554 jbyte tag = cp->tag_at(index).value(); 555 switch (tag) { 556 case JVM_CONSTANT_UnresolvedClass: { 557 Symbol* class_name = cp->unresolved_klass_at(index); 558 // check the name, even if _cp_patches will overwrite it 559 verify_legal_class_name(class_name, CHECK_(nullHandle)); 560 break; 561 } 562 case JVM_CONSTANT_NameAndType: { 563 if (_need_verify && _major_version >= JAVA_7_VERSION) { 564 int sig_index = cp->signature_ref_index_at(index); 565 int name_index = cp->name_ref_index_at(index); 566 Symbol* name = cp->symbol_at(name_index); 567 Symbol* sig = cp->symbol_at(sig_index); 568 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 569 verify_legal_method_signature(name, sig, CHECK_(nullHandle)); 570 } else { 571 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 572 } 573 } 574 break; 575 } 576 case JVM_CONSTANT_Fieldref: 577 case JVM_CONSTANT_Methodref: 578 case JVM_CONSTANT_InterfaceMethodref: { 579 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 580 // already verified to be utf8 581 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 582 // already verified to be utf8 583 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 584 Symbol* name = cp->symbol_at(name_ref_index); 585 Symbol* signature = cp->symbol_at(signature_ref_index); 586 if (tag == JVM_CONSTANT_Fieldref) { 587 verify_legal_field_name(name, CHECK_(nullHandle)); 588 if (_need_verify && _major_version >= JAVA_7_VERSION) { 589 // Signature is verified above, when iterating NameAndType_info. 590 // Need only to be sure it's the right type. 591 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 592 throwIllegalSignature( 593 "Field", name, signature, CHECK_(nullHandle)); 594 } 595 } else { 596 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 597 } 598 } else { 599 verify_legal_method_name(name, CHECK_(nullHandle)); 600 if (_need_verify && _major_version >= JAVA_7_VERSION) { 601 // Signature is verified above, when iterating NameAndType_info. 602 // Need only to be sure it's the right type. 603 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 604 throwIllegalSignature( 605 "Method", name, signature, CHECK_(nullHandle)); 606 } 607 } else { 608 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 609 } 610 if (tag == JVM_CONSTANT_Methodref) { 611 // 4509014: If a class method name begins with '<', it must be "<init>". 612 assert(name != NULL, "method name in constant pool is null"); 613 unsigned int name_len = name->utf8_length(); 614 assert(name_len > 0, "bad method name"); // already verified as legal name 615 if (name->byte_at(0) == '<') { 616 if (name != vmSymbols::object_initializer_name()) { 617 classfile_parse_error( 618 "Bad method name at constant pool index %u in class file %s", 619 name_ref_index, CHECK_(nullHandle)); 620 } 621 } 622 } 623 } 624 break; 625 } 626 case JVM_CONSTANT_MethodHandle: { 627 int ref_index = cp->method_handle_index_at(index); 628 int ref_kind = cp->method_handle_ref_kind_at(index); 629 switch (ref_kind) { 630 case JVM_REF_invokeVirtual: 631 case JVM_REF_invokeStatic: 632 case JVM_REF_invokeSpecial: 633 case JVM_REF_newInvokeSpecial: 634 { 635 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index); 636 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 637 Symbol* name = cp->symbol_at(name_ref_index); 638 if (ref_kind == JVM_REF_newInvokeSpecial) { 639 if (name != vmSymbols::object_initializer_name()) { 640 classfile_parse_error( 641 "Bad constructor name at constant pool index %u in class file %s", 642 name_ref_index, CHECK_(nullHandle)); 643 } 644 } else { 645 if (name == vmSymbols::object_initializer_name()) { 646 classfile_parse_error( 647 "Bad method name at constant pool index %u in class file %s", 648 name_ref_index, CHECK_(nullHandle)); 649 } 650 } 651 } 652 break; 653 // Other ref_kinds are already fully checked in previous pass. 654 } 655 break; 656 } 657 case JVM_CONSTANT_MethodType: { 658 Symbol* no_name = vmSymbols::type_name(); // place holder 659 Symbol* signature = cp->method_type_signature_at(index); 660 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle)); 661 break; 662 } 663 case JVM_CONSTANT_Utf8: { 664 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 665 } 666 } // end of switch 667 } // end of for 668 669 cp_in_error.set_in_error(false); 670 return cp; 671 } 672 673 674 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { 675 assert(AnonymousClasses, ""); 676 BasicType patch_type = T_VOID; 677 switch (cp->tag_at(index).value()) { 678 679 case JVM_CONSTANT_UnresolvedClass : 680 // Patching a class means pre-resolving it. 681 // The name in the constant pool is ignored. 682 if (java_lang_Class::is_instance(patch())) { 683 guarantee_property(!java_lang_Class::is_primitive(patch()), 684 "Illegal class patch at %d in class file %s", 685 index, CHECK); 686 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch())); 687 } else { 688 guarantee_property(java_lang_String::is_instance(patch()), 689 "Illegal class patch at %d in class file %s", 690 index, CHECK); 691 Symbol* name = java_lang_String::as_symbol(patch(), CHECK); 692 cp->unresolved_klass_at_put(index, name); 693 } 694 break; 695 696 case JVM_CONSTANT_UnresolvedString : 697 // Patching a string means pre-resolving it. 698 // The spelling in the constant pool is ignored. 699 // The constant reference may be any object whatever. 700 // If it is not a real interned string, the constant is referred 701 // to as a "pseudo-string", and must be presented to the CP 702 // explicitly, because it may require scavenging. 703 cp->pseudo_string_at_put(index, patch()); 704 break; 705 706 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; 707 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; 708 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; 709 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; 710 patch_prim: 711 { 712 jvalue value; 713 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 714 guarantee_property(value_type == patch_type, 715 "Illegal primitive patch at %d in class file %s", 716 index, CHECK); 717 switch (value_type) { 718 case T_INT: cp->int_at_put(index, value.i); break; 719 case T_FLOAT: cp->float_at_put(index, value.f); break; 720 case T_LONG: cp->long_at_put(index, value.j); break; 721 case T_DOUBLE: cp->double_at_put(index, value.d); break; 722 default: assert(false, ""); 723 } 724 } 725 break; 726 727 default: 728 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 729 guarantee_property(!has_cp_patch_at(index), 730 "Illegal unexpected patch at %d in class file %s", 731 index, CHECK); 732 return; 733 } 734 735 // On fall-through, mark the patch as used. 736 clear_cp_patch_at(index); 737 } 738 739 740 741 class NameSigHash: public ResourceObj { 742 public: 743 Symbol* _name; // name 744 Symbol* _sig; // signature 745 NameSigHash* _next; // Next entry in hash table 746 }; 747 748 749 #define HASH_ROW_SIZE 256 750 751 unsigned int hash(Symbol* name, Symbol* sig) { 752 unsigned int raw_hash = 0; 753 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 754 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 755 756 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 757 } 758 759 760 void initialize_hashtable(NameSigHash** table) { 761 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 762 } 763 764 // Return false if the name/sig combination is found in table. 765 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 766 // The old format checker uses heap sort to find duplicates. 767 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 768 // of table since we don't expect Symbol*'s to move. 769 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) { 770 assert(name != NULL, "name in constant pool is NULL"); 771 772 // First lookup for duplicates 773 int index = hash(name, sig); 774 NameSigHash* entry = table[index]; 775 while (entry != NULL) { 776 if (entry->_name == name && entry->_sig == sig) { 777 return false; 778 } 779 entry = entry->_next; 780 } 781 782 // No duplicate is found, allocate a new entry and fill it. 783 entry = new NameSigHash(); 784 entry->_name = name; 785 entry->_sig = sig; 786 787 // Insert into hash table 788 entry->_next = table[index]; 789 table[index] = entry; 790 791 return true; 792 } 793 794 795 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp, 796 int length, 797 Handle class_loader, 798 Handle protection_domain, 799 Symbol* class_name, 800 TRAPS) { 801 ClassFileStream* cfs = stream(); 802 assert(length > 0, "only called for length>0"); 803 objArrayHandle nullHandle; 804 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 805 objArrayHandle interfaces (THREAD, interface_oop); 806 807 int index; 808 for (index = 0; index < length; index++) { 809 u2 interface_index = cfs->get_u2(CHECK_(nullHandle)); 810 KlassHandle interf; 811 check_property( 812 valid_cp_range(interface_index, cp->length()) && 813 is_klass_reference(cp, interface_index), 814 "Interface name has bad constant pool index %u in class file %s", 815 interface_index, CHECK_(nullHandle)); 816 if (cp->tag_at(interface_index).is_klass()) { 817 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index)); 818 } else { 819 Symbol* unresolved_klass = cp->klass_name_at(interface_index); 820 821 // Don't need to check legal name because it's checked when parsing constant pool. 822 // But need to make sure it's not an array type. 823 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 824 "Bad interface name in class file %s", CHECK_(nullHandle)); 825 826 // Call resolve_super so classcircularity is checked 827 klassOop k = SystemDictionary::resolve_super_or_fail(class_name, 828 unresolved_klass, class_loader, protection_domain, 829 false, CHECK_(nullHandle)); 830 interf = KlassHandle(THREAD, k); 831 832 if (LinkWellKnownClasses) // my super type is well known to me 833 cp->klass_at_put(interface_index, interf()); // eagerly resolve 834 } 835 836 if (!Klass::cast(interf())->is_interface()) { 837 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle); 838 } 839 interfaces->obj_at_put(index, interf()); 840 } 841 842 if (!_need_verify || length <= 1) { 843 return interfaces; 844 } 845 846 // Check if there's any duplicates in interfaces 847 ResourceMark rm(THREAD); 848 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 849 THREAD, NameSigHash*, HASH_ROW_SIZE); 850 initialize_hashtable(interface_names); 851 bool dup = false; 852 { 853 debug_only(No_Safepoint_Verifier nsv;) 854 for (index = 0; index < length; index++) { 855 klassOop k = (klassOop)interfaces->obj_at(index); 856 Symbol* name = instanceKlass::cast(k)->name(); 857 // If no duplicates, add (name, NULL) in hashtable interface_names. 858 if (!put_after_lookup(name, NULL, interface_names)) { 859 dup = true; 860 break; 861 } 862 } 863 } 864 if (dup) { 865 classfile_parse_error("Duplicate interface name in class file %s", 866 CHECK_(nullHandle)); 867 } 868 869 return interfaces; 870 } 871 872 873 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) { 874 // Make sure the constant pool entry is of a type appropriate to this field 875 guarantee_property( 876 (constantvalue_index > 0 && 877 constantvalue_index < cp->length()), 878 "Bad initial value index %u in ConstantValue attribute in class file %s", 879 constantvalue_index, CHECK); 880 constantTag value_type = cp->tag_at(constantvalue_index); 881 switch ( cp->basic_type_for_signature_at(signature_index) ) { 882 case T_LONG: 883 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 884 break; 885 case T_FLOAT: 886 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 887 break; 888 case T_DOUBLE: 889 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 890 break; 891 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 892 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 893 break; 894 case T_OBJECT: 895 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 896 && (value_type.is_string() || value_type.is_unresolved_string())), 897 "Bad string initial value in class file %s", CHECK); 898 break; 899 default: 900 classfile_parse_error( 901 "Unable to set initial value %u in class file %s", 902 constantvalue_index, CHECK); 903 } 904 } 905 906 907 // Parse attributes for a field. 908 void ClassFileParser::parse_field_attributes(constantPoolHandle cp, 909 u2 attributes_count, 910 bool is_static, u2 signature_index, 911 u2* constantvalue_index_addr, 912 bool* is_synthetic_addr, 913 u2* generic_signature_index_addr, 914 typeArrayHandle* field_annotations, 915 TRAPS) { 916 ClassFileStream* cfs = stream(); 917 assert(attributes_count > 0, "length should be greater than 0"); 918 u2 constantvalue_index = 0; 919 u2 generic_signature_index = 0; 920 bool is_synthetic = false; 921 u1* runtime_visible_annotations = NULL; 922 int runtime_visible_annotations_length = 0; 923 u1* runtime_invisible_annotations = NULL; 924 int runtime_invisible_annotations_length = 0; 925 while (attributes_count--) { 926 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 927 u2 attribute_name_index = cfs->get_u2_fast(); 928 u4 attribute_length = cfs->get_u4_fast(); 929 check_property(valid_cp_range(attribute_name_index, cp->length()) && 930 cp->tag_at(attribute_name_index).is_utf8(), 931 "Invalid field attribute index %u in class file %s", 932 attribute_name_index, 933 CHECK); 934 Symbol* attribute_name = cp->symbol_at(attribute_name_index); 935 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 936 // ignore if non-static 937 if (constantvalue_index != 0) { 938 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 939 } 940 check_property( 941 attribute_length == 2, 942 "Invalid ConstantValue field attribute length %u in class file %s", 943 attribute_length, CHECK); 944 constantvalue_index = cfs->get_u2(CHECK); 945 if (_need_verify) { 946 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK); 947 } 948 } else if (attribute_name == vmSymbols::tag_synthetic()) { 949 if (attribute_length != 0) { 950 classfile_parse_error( 951 "Invalid Synthetic field attribute length %u in class file %s", 952 attribute_length, CHECK); 953 } 954 is_synthetic = true; 955 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 956 if (attribute_length != 0) { 957 classfile_parse_error( 958 "Invalid Deprecated field attribute length %u in class file %s", 959 attribute_length, CHECK); 960 } 961 } else if (_major_version >= JAVA_1_5_VERSION) { 962 if (attribute_name == vmSymbols::tag_signature()) { 963 if (attribute_length != 2) { 964 classfile_parse_error( 965 "Wrong size %u for field's Signature attribute in class file %s", 966 attribute_length, CHECK); 967 } 968 generic_signature_index = cfs->get_u2(CHECK); 969 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 970 runtime_visible_annotations_length = attribute_length; 971 runtime_visible_annotations = cfs->get_u1_buffer(); 972 assert(runtime_visible_annotations != NULL, "null visible annotations"); 973 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 974 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 975 runtime_invisible_annotations_length = attribute_length; 976 runtime_invisible_annotations = cfs->get_u1_buffer(); 977 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 978 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 979 } else { 980 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 981 } 982 } else { 983 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 984 } 985 } 986 987 *constantvalue_index_addr = constantvalue_index; 988 *is_synthetic_addr = is_synthetic; 989 *generic_signature_index_addr = generic_signature_index; 990 *field_annotations = assemble_annotations(runtime_visible_annotations, 991 runtime_visible_annotations_length, 992 runtime_invisible_annotations, 993 runtime_invisible_annotations_length, 994 CHECK); 995 return; 996 } 997 998 999 // Field allocation types. Used for computing field offsets. 1000 1001 enum FieldAllocationType { 1002 STATIC_OOP, // Oops 1003 STATIC_BYTE, // Boolean, Byte, char 1004 STATIC_SHORT, // shorts 1005 STATIC_WORD, // ints 1006 STATIC_DOUBLE, // long or double 1007 STATIC_ALIGNED_DOUBLE,// aligned long or double 1008 NONSTATIC_OOP, 1009 NONSTATIC_BYTE, 1010 NONSTATIC_SHORT, 1011 NONSTATIC_WORD, 1012 NONSTATIC_DOUBLE, 1013 NONSTATIC_ALIGNED_DOUBLE 1014 }; 1015 1016 1017 struct FieldAllocationCount { 1018 unsigned int static_oop_count; 1019 unsigned int static_byte_count; 1020 unsigned int static_short_count; 1021 unsigned int static_word_count; 1022 unsigned int static_double_count; 1023 unsigned int nonstatic_oop_count; 1024 unsigned int nonstatic_byte_count; 1025 unsigned int nonstatic_short_count; 1026 unsigned int nonstatic_word_count; 1027 unsigned int nonstatic_double_count; 1028 }; 1029 1030 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface, 1031 struct FieldAllocationCount *fac, 1032 objArrayHandle* fields_annotations, TRAPS) { 1033 ClassFileStream* cfs = stream(); 1034 typeArrayHandle nullHandle; 1035 cfs->guarantee_more(2, CHECK_(nullHandle)); // length 1036 u2 length = cfs->get_u2_fast(); 1037 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index] 1038 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle)); 1039 typeArrayHandle fields(THREAD, new_fields); 1040 1041 int index = 0; 1042 typeArrayHandle field_annotations; 1043 for (int n = 0; n < length; n++) { 1044 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1045 1046 AccessFlags access_flags; 1047 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1048 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle)); 1049 access_flags.set_flags(flags); 1050 1051 u2 name_index = cfs->get_u2_fast(); 1052 int cp_size = cp->length(); 1053 check_property( 1054 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(), 1055 "Invalid constant pool index %u for field name in class file %s", 1056 name_index, CHECK_(nullHandle)); 1057 Symbol* name = cp->symbol_at(name_index); 1058 verify_legal_field_name(name, CHECK_(nullHandle)); 1059 1060 u2 signature_index = cfs->get_u2_fast(); 1061 check_property( 1062 valid_cp_range(signature_index, cp_size) && 1063 cp->tag_at(signature_index).is_utf8(), 1064 "Invalid constant pool index %u for field signature in class file %s", 1065 signature_index, CHECK_(nullHandle)); 1066 Symbol* sig = cp->symbol_at(signature_index); 1067 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 1068 1069 u2 constantvalue_index = 0; 1070 bool is_synthetic = false; 1071 u2 generic_signature_index = 0; 1072 bool is_static = access_flags.is_static(); 1073 1074 u2 attributes_count = cfs->get_u2_fast(); 1075 if (attributes_count > 0) { 1076 parse_field_attributes(cp, attributes_count, is_static, signature_index, 1077 &constantvalue_index, &is_synthetic, 1078 &generic_signature_index, &field_annotations, 1079 CHECK_(nullHandle)); 1080 if (field_annotations.not_null()) { 1081 if (fields_annotations->is_null()) { 1082 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1083 *fields_annotations = objArrayHandle(THREAD, md); 1084 } 1085 (*fields_annotations)->obj_at_put(n, field_annotations()); 1086 } 1087 if (is_synthetic) { 1088 access_flags.set_is_synthetic(); 1089 } 1090 } 1091 1092 fields->short_at_put(index++, access_flags.as_short()); 1093 fields->short_at_put(index++, name_index); 1094 fields->short_at_put(index++, signature_index); 1095 fields->short_at_put(index++, constantvalue_index); 1096 1097 // Remember how many oops we encountered and compute allocation type 1098 BasicType type = cp->basic_type_for_signature_at(signature_index); 1099 FieldAllocationType atype; 1100 if ( is_static ) { 1101 switch ( type ) { 1102 case T_BOOLEAN: 1103 case T_BYTE: 1104 fac->static_byte_count++; 1105 atype = STATIC_BYTE; 1106 break; 1107 case T_LONG: 1108 case T_DOUBLE: 1109 if (Universe::field_type_should_be_aligned(type)) { 1110 atype = STATIC_ALIGNED_DOUBLE; 1111 } else { 1112 atype = STATIC_DOUBLE; 1113 } 1114 fac->static_double_count++; 1115 break; 1116 case T_CHAR: 1117 case T_SHORT: 1118 fac->static_short_count++; 1119 atype = STATIC_SHORT; 1120 break; 1121 case T_FLOAT: 1122 case T_INT: 1123 fac->static_word_count++; 1124 atype = STATIC_WORD; 1125 break; 1126 case T_ARRAY: 1127 case T_OBJECT: 1128 fac->static_oop_count++; 1129 atype = STATIC_OOP; 1130 break; 1131 case T_ADDRESS: 1132 case T_VOID: 1133 default: 1134 assert(0, "bad field type"); 1135 } 1136 } else { 1137 switch ( type ) { 1138 case T_BOOLEAN: 1139 case T_BYTE: 1140 fac->nonstatic_byte_count++; 1141 atype = NONSTATIC_BYTE; 1142 break; 1143 case T_LONG: 1144 case T_DOUBLE: 1145 if (Universe::field_type_should_be_aligned(type)) { 1146 atype = NONSTATIC_ALIGNED_DOUBLE; 1147 } else { 1148 atype = NONSTATIC_DOUBLE; 1149 } 1150 fac->nonstatic_double_count++; 1151 break; 1152 case T_CHAR: 1153 case T_SHORT: 1154 fac->nonstatic_short_count++; 1155 atype = NONSTATIC_SHORT; 1156 break; 1157 case T_FLOAT: 1158 case T_INT: 1159 fac->nonstatic_word_count++; 1160 atype = NONSTATIC_WORD; 1161 break; 1162 case T_ARRAY: 1163 case T_OBJECT: 1164 fac->nonstatic_oop_count++; 1165 atype = NONSTATIC_OOP; 1166 break; 1167 case T_ADDRESS: 1168 case T_VOID: 1169 default: 1170 assert(0, "bad field type"); 1171 } 1172 } 1173 1174 // The correct offset is computed later (all oop fields will be located together) 1175 // We temporarily store the allocation type in the offset field 1176 fields->short_at_put(index++, atype); 1177 fields->short_at_put(index++, 0); // Clear out high word of byte offset 1178 fields->short_at_put(index++, generic_signature_index); 1179 } 1180 1181 if (_need_verify && length > 1) { 1182 // Check duplicated fields 1183 ResourceMark rm(THREAD); 1184 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1185 THREAD, NameSigHash*, HASH_ROW_SIZE); 1186 initialize_hashtable(names_and_sigs); 1187 bool dup = false; 1188 { 1189 debug_only(No_Safepoint_Verifier nsv;) 1190 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) { 1191 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset); 1192 Symbol* name = cp->symbol_at(name_index); 1193 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset); 1194 Symbol* sig = cp->symbol_at(sig_index); 1195 // If no duplicates, add name/signature in hashtable names_and_sigs. 1196 if (!put_after_lookup(name, sig, names_and_sigs)) { 1197 dup = true; 1198 break; 1199 } 1200 } 1201 } 1202 if (dup) { 1203 classfile_parse_error("Duplicate field name&signature in class file %s", 1204 CHECK_(nullHandle)); 1205 } 1206 } 1207 1208 return fields; 1209 } 1210 1211 1212 static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 1213 while (length-- > 0) { 1214 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 1215 } 1216 } 1217 1218 1219 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length, 1220 u4 exception_table_length, 1221 constantPoolHandle cp, 1222 TRAPS) { 1223 ClassFileStream* cfs = stream(); 1224 typeArrayHandle nullHandle; 1225 1226 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index] 1227 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle)); 1228 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh); 1229 1230 int index = 0; 1231 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index 1232 for (unsigned int i = 0; i < exception_table_length; i++) { 1233 u2 start_pc = cfs->get_u2_fast(); 1234 u2 end_pc = cfs->get_u2_fast(); 1235 u2 handler_pc = cfs->get_u2_fast(); 1236 u2 catch_type_index = cfs->get_u2_fast(); 1237 // Will check legal target after parsing code array in verifier. 1238 if (_need_verify) { 1239 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1240 "Illegal exception table range in class file %s", CHECK_(nullHandle)); 1241 guarantee_property(handler_pc < code_length, 1242 "Illegal exception table handler in class file %s", CHECK_(nullHandle)); 1243 if (catch_type_index != 0) { 1244 guarantee_property(valid_cp_range(catch_type_index, cp->length()) && 1245 is_klass_reference(cp, catch_type_index), 1246 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle)); 1247 } 1248 } 1249 exception_handlers->int_at_put(index++, start_pc); 1250 exception_handlers->int_at_put(index++, end_pc); 1251 exception_handlers->int_at_put(index++, handler_pc); 1252 exception_handlers->int_at_put(index++, catch_type_index); 1253 } 1254 return exception_handlers; 1255 } 1256 1257 void ClassFileParser::parse_linenumber_table( 1258 u4 code_attribute_length, u4 code_length, 1259 CompressedLineNumberWriteStream** write_stream, TRAPS) { 1260 ClassFileStream* cfs = stream(); 1261 unsigned int num_entries = cfs->get_u2(CHECK); 1262 1263 // Each entry is a u2 start_pc, and a u2 line_number 1264 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 1265 1266 // Verify line number attribute and table length 1267 check_property( 1268 code_attribute_length == sizeof(u2) + length_in_bytes, 1269 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1270 1271 cfs->guarantee_more(length_in_bytes, CHECK); 1272 1273 if ((*write_stream) == NULL) { 1274 if (length_in_bytes > fixed_buffer_size) { 1275 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1276 } else { 1277 (*write_stream) = new CompressedLineNumberWriteStream( 1278 linenumbertable_buffer, fixed_buffer_size); 1279 } 1280 } 1281 1282 while (num_entries-- > 0) { 1283 u2 bci = cfs->get_u2_fast(); // start_pc 1284 u2 line = cfs->get_u2_fast(); // line_number 1285 guarantee_property(bci < code_length, 1286 "Invalid pc in LineNumberTable in class file %s", CHECK); 1287 (*write_stream)->write_pair(bci, line); 1288 } 1289 } 1290 1291 1292 // Class file LocalVariableTable elements. 1293 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1294 public: 1295 u2 start_bci; 1296 u2 length; 1297 u2 name_cp_index; 1298 u2 descriptor_cp_index; 1299 u2 slot; 1300 }; 1301 1302 1303 class LVT_Hash: public CHeapObj { 1304 public: 1305 LocalVariableTableElement *_elem; // element 1306 LVT_Hash* _next; // Next entry in hash table 1307 }; 1308 1309 unsigned int hash(LocalVariableTableElement *elem) { 1310 unsigned int raw_hash = elem->start_bci; 1311 1312 raw_hash = elem->length + raw_hash * 37; 1313 raw_hash = elem->name_cp_index + raw_hash * 37; 1314 raw_hash = elem->slot + raw_hash * 37; 1315 1316 return raw_hash % HASH_ROW_SIZE; 1317 } 1318 1319 void initialize_hashtable(LVT_Hash** table) { 1320 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1321 table[i] = NULL; 1322 } 1323 } 1324 1325 void clear_hashtable(LVT_Hash** table) { 1326 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1327 LVT_Hash* current = table[i]; 1328 LVT_Hash* next; 1329 while (current != NULL) { 1330 next = current->_next; 1331 current->_next = NULL; 1332 delete(current); 1333 current = next; 1334 } 1335 table[i] = NULL; 1336 } 1337 } 1338 1339 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) { 1340 LVT_Hash* entry = table[index]; 1341 1342 /* 1343 * 3-tuple start_bci/length/slot has to be unique key, 1344 * so the following comparison seems to be redundant: 1345 * && elem->name_cp_index == entry->_elem->name_cp_index 1346 */ 1347 while (entry != NULL) { 1348 if (elem->start_bci == entry->_elem->start_bci 1349 && elem->length == entry->_elem->length 1350 && elem->name_cp_index == entry->_elem->name_cp_index 1351 && elem->slot == entry->_elem->slot 1352 ) { 1353 return entry; 1354 } 1355 entry = entry->_next; 1356 } 1357 return NULL; 1358 } 1359 1360 // Return false if the local variable is found in table. 1361 // Return true if no duplicate is found. 1362 // And local variable is added as a new entry in table. 1363 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) { 1364 // First lookup for duplicates 1365 int index = hash(elem); 1366 LVT_Hash* entry = LVT_lookup(elem, index, table); 1367 1368 if (entry != NULL) { 1369 return false; 1370 } 1371 // No duplicate is found, allocate a new entry and fill it. 1372 if ((entry = new LVT_Hash()) == NULL) { 1373 return false; 1374 } 1375 entry->_elem = elem; 1376 1377 // Insert into hash table 1378 entry->_next = table[index]; 1379 table[index] = entry; 1380 1381 return true; 1382 } 1383 1384 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1385 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1386 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1387 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1388 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1389 lvt->signature_cp_index = 0; 1390 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1391 } 1392 1393 // Function is used to parse both attributes: 1394 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1395 u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1396 u2 max_locals, 1397 u4 code_attribute_length, 1398 constantPoolHandle cp, 1399 u2* localvariable_table_length, 1400 bool isLVTT, 1401 TRAPS) { 1402 ClassFileStream* cfs = stream(); 1403 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1404 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1405 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1406 // Verify local variable table attribute has right length 1407 if (_need_verify) { 1408 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1409 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1410 } 1411 u2* localvariable_table_start = cfs->get_u2_buffer(); 1412 assert(localvariable_table_start != NULL, "null local variable table"); 1413 if (!_need_verify) { 1414 cfs->skip_u2_fast(size); 1415 } else { 1416 cfs->guarantee_more(size * 2, CHECK_NULL); 1417 for(int i = 0; i < (*localvariable_table_length); i++) { 1418 u2 start_pc = cfs->get_u2_fast(); 1419 u2 length = cfs->get_u2_fast(); 1420 u2 name_index = cfs->get_u2_fast(); 1421 u2 descriptor_index = cfs->get_u2_fast(); 1422 u2 index = cfs->get_u2_fast(); 1423 // Assign to a u4 to avoid overflow 1424 u4 end_pc = (u4)start_pc + (u4)length; 1425 1426 if (start_pc >= code_length) { 1427 classfile_parse_error( 1428 "Invalid start_pc %u in %s in class file %s", 1429 start_pc, tbl_name, CHECK_NULL); 1430 } 1431 if (end_pc > code_length) { 1432 classfile_parse_error( 1433 "Invalid length %u in %s in class file %s", 1434 length, tbl_name, CHECK_NULL); 1435 } 1436 int cp_size = cp->length(); 1437 guarantee_property( 1438 valid_cp_range(name_index, cp_size) && 1439 cp->tag_at(name_index).is_utf8(), 1440 "Name index %u in %s has bad constant type in class file %s", 1441 name_index, tbl_name, CHECK_NULL); 1442 guarantee_property( 1443 valid_cp_range(descriptor_index, cp_size) && 1444 cp->tag_at(descriptor_index).is_utf8(), 1445 "Signature index %u in %s has bad constant type in class file %s", 1446 descriptor_index, tbl_name, CHECK_NULL); 1447 1448 Symbol* name = cp->symbol_at(name_index); 1449 Symbol* sig = cp->symbol_at(descriptor_index); 1450 verify_legal_field_name(name, CHECK_NULL); 1451 u2 extra_slot = 0; 1452 if (!isLVTT) { 1453 verify_legal_field_signature(name, sig, CHECK_NULL); 1454 1455 // 4894874: check special cases for double and long local variables 1456 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1457 sig == vmSymbols::type_signature(T_LONG)) { 1458 extra_slot = 1; 1459 } 1460 } 1461 guarantee_property((index + extra_slot) < max_locals, 1462 "Invalid index %u in %s in class file %s", 1463 index, tbl_name, CHECK_NULL); 1464 } 1465 } 1466 return localvariable_table_start; 1467 } 1468 1469 1470 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1471 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) { 1472 ClassFileStream* cfs = stream(); 1473 u2 index = 0; // index in the array with long/double occupying two slots 1474 u4 i1 = *u1_index; 1475 u4 i2 = *u2_index + 1; 1476 for(int i = 0; i < array_length; i++) { 1477 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1478 index++; 1479 if (tag == ITEM_Long || tag == ITEM_Double) { 1480 index++; 1481 } else if (tag == ITEM_Object) { 1482 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1483 guarantee_property(valid_cp_range(class_index, cp->length()) && 1484 is_klass_reference(cp, class_index), 1485 "Bad class index %u in StackMap in class file %s", 1486 class_index, CHECK); 1487 } else if (tag == ITEM_Uninitialized) { 1488 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1489 guarantee_property( 1490 offset < code_length, 1491 "Bad uninitialized type offset %u in StackMap in class file %s", 1492 offset, CHECK); 1493 } else { 1494 guarantee_property( 1495 tag <= (u1)ITEM_Uninitialized, 1496 "Unknown variable type %u in StackMap in class file %s", 1497 tag, CHECK); 1498 } 1499 } 1500 u2_array[*u2_index] = index; 1501 *u1_index = i1; 1502 *u2_index = i2; 1503 } 1504 1505 typeArrayOop ClassFileParser::parse_stackmap_table( 1506 u4 code_attribute_length, TRAPS) { 1507 if (code_attribute_length == 0) 1508 return NULL; 1509 1510 ClassFileStream* cfs = stream(); 1511 u1* stackmap_table_start = cfs->get_u1_buffer(); 1512 assert(stackmap_table_start != NULL, "null stackmap table"); 1513 1514 // check code_attribute_length first 1515 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1516 1517 if (!_need_verify && !DumpSharedSpaces) { 1518 return NULL; 1519 } 1520 1521 typeArrayOop stackmap_data = 1522 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL); 1523 1524 stackmap_data->set_length(code_attribute_length); 1525 memcpy((void*)stackmap_data->byte_at_addr(0), 1526 (void*)stackmap_table_start, code_attribute_length); 1527 return stackmap_data; 1528 } 1529 1530 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1531 u4 method_attribute_length, 1532 constantPoolHandle cp, TRAPS) { 1533 ClassFileStream* cfs = stream(); 1534 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1535 *checked_exceptions_length = cfs->get_u2_fast(); 1536 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1537 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1538 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1539 if (!_need_verify) { 1540 cfs->skip_u2_fast(size); 1541 } else { 1542 // Verify each value in the checked exception table 1543 u2 checked_exception; 1544 u2 len = *checked_exceptions_length; 1545 cfs->guarantee_more(2 * len, CHECK_NULL); 1546 for (int i = 0; i < len; i++) { 1547 checked_exception = cfs->get_u2_fast(); 1548 check_property( 1549 valid_cp_range(checked_exception, cp->length()) && 1550 is_klass_reference(cp, checked_exception), 1551 "Exception name has bad type at constant pool %u in class file %s", 1552 checked_exception, CHECK_NULL); 1553 } 1554 } 1555 // check exceptions attribute length 1556 if (_need_verify) { 1557 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1558 sizeof(u2) * size), 1559 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1560 } 1561 return checked_exceptions_start; 1562 } 1563 1564 void ClassFileParser::throwIllegalSignature( 1565 const char* type, Symbol* name, Symbol* sig, TRAPS) { 1566 ResourceMark rm(THREAD); 1567 Exceptions::fthrow(THREAD_AND_LOCATION, 1568 vmSymbols::java_lang_ClassFormatError(), 1569 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1570 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1571 } 1572 1573 #define MAX_ARGS_SIZE 255 1574 #define MAX_CODE_SIZE 65535 1575 #define INITIAL_MAX_LVT_NUMBER 256 1576 1577 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1578 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the 1579 // methodOop to save footprint, so we only know the size of the resulting methodOop when the 1580 // entire method attribute is parsed. 1581 // 1582 // The promoted_flags parameter is used to pass relevant access_flags 1583 // from the method back up to the containing klass. These flag values 1584 // are added to klass's access_flags. 1585 1586 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface, 1587 AccessFlags *promoted_flags, 1588 typeArrayHandle* method_annotations, 1589 typeArrayHandle* method_parameter_annotations, 1590 typeArrayHandle* method_default_annotations, 1591 TRAPS) { 1592 ClassFileStream* cfs = stream(); 1593 methodHandle nullHandle; 1594 ResourceMark rm(THREAD); 1595 // Parse fixed parts 1596 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1597 1598 int flags = cfs->get_u2_fast(); 1599 u2 name_index = cfs->get_u2_fast(); 1600 int cp_size = cp->length(); 1601 check_property( 1602 valid_cp_range(name_index, cp_size) && 1603 cp->tag_at(name_index).is_utf8(), 1604 "Illegal constant pool index %u for method name in class file %s", 1605 name_index, CHECK_(nullHandle)); 1606 Symbol* name = cp->symbol_at(name_index); 1607 verify_legal_method_name(name, CHECK_(nullHandle)); 1608 1609 u2 signature_index = cfs->get_u2_fast(); 1610 guarantee_property( 1611 valid_cp_range(signature_index, cp_size) && 1612 cp->tag_at(signature_index).is_utf8(), 1613 "Illegal constant pool index %u for method signature in class file %s", 1614 signature_index, CHECK_(nullHandle)); 1615 Symbol* signature = cp->symbol_at(signature_index); 1616 1617 AccessFlags access_flags; 1618 if (name == vmSymbols::class_initializer_name()) { 1619 // We ignore the access flags for a class initializer. (JVM Spec. p. 116) 1620 flags = JVM_ACC_STATIC; 1621 } else { 1622 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 1623 } 1624 1625 int args_size = -1; // only used when _need_verify is true 1626 if (_need_verify) { 1627 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 1628 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 1629 if (args_size > MAX_ARGS_SIZE) { 1630 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 1631 } 1632 } 1633 1634 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 1635 1636 // Default values for code and exceptions attribute elements 1637 u2 max_stack = 0; 1638 u2 max_locals = 0; 1639 u4 code_length = 0; 1640 u1* code_start = 0; 1641 u2 exception_table_length = 0; 1642 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array()); 1643 u2 checked_exceptions_length = 0; 1644 u2* checked_exceptions_start = NULL; 1645 CompressedLineNumberWriteStream* linenumber_table = NULL; 1646 int linenumber_table_length = 0; 1647 int total_lvt_length = 0; 1648 u2 lvt_cnt = 0; 1649 u2 lvtt_cnt = 0; 1650 bool lvt_allocated = false; 1651 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 1652 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 1653 u2* localvariable_table_length; 1654 u2** localvariable_table_start; 1655 u2* localvariable_type_table_length; 1656 u2** localvariable_type_table_start; 1657 bool parsed_code_attribute = false; 1658 bool parsed_checked_exceptions_attribute = false; 1659 bool parsed_stackmap_attribute = false; 1660 // stackmap attribute - JDK1.5 1661 typeArrayHandle stackmap_data; 1662 u2 generic_signature_index = 0; 1663 u1* runtime_visible_annotations = NULL; 1664 int runtime_visible_annotations_length = 0; 1665 u1* runtime_invisible_annotations = NULL; 1666 int runtime_invisible_annotations_length = 0; 1667 u1* runtime_visible_parameter_annotations = NULL; 1668 int runtime_visible_parameter_annotations_length = 0; 1669 u1* runtime_invisible_parameter_annotations = NULL; 1670 int runtime_invisible_parameter_annotations_length = 0; 1671 u1* annotation_default = NULL; 1672 int annotation_default_length = 0; 1673 1674 // Parse code and exceptions attribute 1675 u2 method_attributes_count = cfs->get_u2_fast(); 1676 while (method_attributes_count--) { 1677 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 1678 u2 method_attribute_name_index = cfs->get_u2_fast(); 1679 u4 method_attribute_length = cfs->get_u4_fast(); 1680 check_property( 1681 valid_cp_range(method_attribute_name_index, cp_size) && 1682 cp->tag_at(method_attribute_name_index).is_utf8(), 1683 "Invalid method attribute name index %u in class file %s", 1684 method_attribute_name_index, CHECK_(nullHandle)); 1685 1686 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index); 1687 if (method_attribute_name == vmSymbols::tag_code()) { 1688 // Parse Code attribute 1689 if (_need_verify) { 1690 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(), 1691 "Code attribute in native or abstract methods in class file %s", 1692 CHECK_(nullHandle)); 1693 } 1694 if (parsed_code_attribute) { 1695 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 1696 } 1697 parsed_code_attribute = true; 1698 1699 // Stack size, locals size, and code size 1700 if (_major_version == 45 && _minor_version <= 2) { 1701 cfs->guarantee_more(4, CHECK_(nullHandle)); 1702 max_stack = cfs->get_u1_fast(); 1703 max_locals = cfs->get_u1_fast(); 1704 code_length = cfs->get_u2_fast(); 1705 } else { 1706 cfs->guarantee_more(8, CHECK_(nullHandle)); 1707 max_stack = cfs->get_u2_fast(); 1708 max_locals = cfs->get_u2_fast(); 1709 code_length = cfs->get_u4_fast(); 1710 } 1711 if (_need_verify) { 1712 guarantee_property(args_size <= max_locals, 1713 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 1714 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 1715 "Invalid method Code length %u in class file %s", 1716 code_length, CHECK_(nullHandle)); 1717 } 1718 // Code pointer 1719 code_start = cfs->get_u1_buffer(); 1720 assert(code_start != NULL, "null code start"); 1721 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 1722 cfs->skip_u1_fast(code_length); 1723 1724 // Exception handler table 1725 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 1726 exception_table_length = cfs->get_u2_fast(); 1727 if (exception_table_length > 0) { 1728 exception_handlers = 1729 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle)); 1730 } 1731 1732 // Parse additional attributes in code attribute 1733 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 1734 u2 code_attributes_count = cfs->get_u2_fast(); 1735 1736 unsigned int calculated_attribute_length = 0; 1737 1738 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 1739 calculated_attribute_length = 1740 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 1741 } else { 1742 // max_stack, locals and length are smaller in pre-version 45.2 classes 1743 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 1744 } 1745 calculated_attribute_length += 1746 code_length + 1747 sizeof(exception_table_length) + 1748 sizeof(code_attributes_count) + 1749 exception_table_length * 1750 ( sizeof(u2) + // start_pc 1751 sizeof(u2) + // end_pc 1752 sizeof(u2) + // handler_pc 1753 sizeof(u2) ); // catch_type_index 1754 1755 while (code_attributes_count--) { 1756 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 1757 u2 code_attribute_name_index = cfs->get_u2_fast(); 1758 u4 code_attribute_length = cfs->get_u4_fast(); 1759 calculated_attribute_length += code_attribute_length + 1760 sizeof(code_attribute_name_index) + 1761 sizeof(code_attribute_length); 1762 check_property(valid_cp_range(code_attribute_name_index, cp_size) && 1763 cp->tag_at(code_attribute_name_index).is_utf8(), 1764 "Invalid code attribute name index %u in class file %s", 1765 code_attribute_name_index, 1766 CHECK_(nullHandle)); 1767 if (LoadLineNumberTables && 1768 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 1769 // Parse and compress line number table 1770 parse_linenumber_table(code_attribute_length, code_length, 1771 &linenumber_table, CHECK_(nullHandle)); 1772 1773 } else if (LoadLocalVariableTables && 1774 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 1775 // Parse local variable table 1776 if (!lvt_allocated) { 1777 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1778 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1779 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1780 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1781 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1782 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1783 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1784 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1785 lvt_allocated = true; 1786 } 1787 if (lvt_cnt == max_lvt_cnt) { 1788 max_lvt_cnt <<= 1; 1789 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 1790 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 1791 } 1792 localvariable_table_start[lvt_cnt] = 1793 parse_localvariable_table(code_length, 1794 max_locals, 1795 code_attribute_length, 1796 cp, 1797 &localvariable_table_length[lvt_cnt], 1798 false, // is not LVTT 1799 CHECK_(nullHandle)); 1800 total_lvt_length += localvariable_table_length[lvt_cnt]; 1801 lvt_cnt++; 1802 } else if (LoadLocalVariableTypeTables && 1803 _major_version >= JAVA_1_5_VERSION && 1804 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 1805 if (!lvt_allocated) { 1806 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1807 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1808 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1809 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1810 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1811 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1812 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1813 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1814 lvt_allocated = true; 1815 } 1816 // Parse local variable type table 1817 if (lvtt_cnt == max_lvtt_cnt) { 1818 max_lvtt_cnt <<= 1; 1819 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 1820 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 1821 } 1822 localvariable_type_table_start[lvtt_cnt] = 1823 parse_localvariable_table(code_length, 1824 max_locals, 1825 code_attribute_length, 1826 cp, 1827 &localvariable_type_table_length[lvtt_cnt], 1828 true, // is LVTT 1829 CHECK_(nullHandle)); 1830 lvtt_cnt++; 1831 } else if (UseSplitVerifier && 1832 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 1833 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 1834 // Stack map is only needed by the new verifier in JDK1.5. 1835 if (parsed_stackmap_attribute) { 1836 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 1837 } 1838 typeArrayOop sm = 1839 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 1840 stackmap_data = typeArrayHandle(THREAD, sm); 1841 parsed_stackmap_attribute = true; 1842 } else { 1843 // Skip unknown attributes 1844 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 1845 } 1846 } 1847 // check method attribute length 1848 if (_need_verify) { 1849 guarantee_property(method_attribute_length == calculated_attribute_length, 1850 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 1851 } 1852 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 1853 // Parse Exceptions attribute 1854 if (parsed_checked_exceptions_attribute) { 1855 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 1856 } 1857 parsed_checked_exceptions_attribute = true; 1858 checked_exceptions_start = 1859 parse_checked_exceptions(&checked_exceptions_length, 1860 method_attribute_length, 1861 cp, CHECK_(nullHandle)); 1862 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 1863 if (method_attribute_length != 0) { 1864 classfile_parse_error( 1865 "Invalid Synthetic method attribute length %u in class file %s", 1866 method_attribute_length, CHECK_(nullHandle)); 1867 } 1868 // Should we check that there hasn't already been a synthetic attribute? 1869 access_flags.set_is_synthetic(); 1870 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1871 if (method_attribute_length != 0) { 1872 classfile_parse_error( 1873 "Invalid Deprecated method attribute length %u in class file %s", 1874 method_attribute_length, CHECK_(nullHandle)); 1875 } 1876 } else if (_major_version >= JAVA_1_5_VERSION) { 1877 if (method_attribute_name == vmSymbols::tag_signature()) { 1878 if (method_attribute_length != 2) { 1879 classfile_parse_error( 1880 "Invalid Signature attribute length %u in class file %s", 1881 method_attribute_length, CHECK_(nullHandle)); 1882 } 1883 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index 1884 generic_signature_index = cfs->get_u2_fast(); 1885 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1886 runtime_visible_annotations_length = method_attribute_length; 1887 runtime_visible_annotations = cfs->get_u1_buffer(); 1888 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1889 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 1890 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1891 runtime_invisible_annotations_length = method_attribute_length; 1892 runtime_invisible_annotations = cfs->get_u1_buffer(); 1893 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1894 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle)); 1895 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 1896 runtime_visible_parameter_annotations_length = method_attribute_length; 1897 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 1898 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 1899 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 1900 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 1901 runtime_invisible_parameter_annotations_length = method_attribute_length; 1902 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 1903 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 1904 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle)); 1905 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 1906 annotation_default_length = method_attribute_length; 1907 annotation_default = cfs->get_u1_buffer(); 1908 assert(annotation_default != NULL, "null annotation default"); 1909 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 1910 } else { 1911 // Skip unknown attributes 1912 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 1913 } 1914 } else { 1915 // Skip unknown attributes 1916 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 1917 } 1918 } 1919 1920 if (linenumber_table != NULL) { 1921 linenumber_table->write_terminator(); 1922 linenumber_table_length = linenumber_table->position(); 1923 } 1924 1925 // Make sure there's at least one Code attribute in non-native/non-abstract method 1926 if (_need_verify) { 1927 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 1928 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 1929 } 1930 1931 // All sizing information for a methodOop is finally available, now create it 1932 methodOop m_oop = oopFactory::new_method(code_length, access_flags, linenumber_table_length, 1933 total_lvt_length, checked_exceptions_length, 1934 oopDesc::IsSafeConc, CHECK_(nullHandle)); 1935 methodHandle m (THREAD, m_oop); 1936 1937 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize); 1938 1939 // Fill in information from fixed part (access_flags already set) 1940 m->set_constants(cp()); 1941 m->set_name_index(name_index); 1942 m->set_signature_index(signature_index); 1943 m->set_generic_signature_index(generic_signature_index); 1944 #ifdef CC_INTERP 1945 // hmm is there a gc issue here?? 1946 ResultTypeFinder rtf(cp->symbol_at(signature_index)); 1947 m->set_result_index(rtf.type()); 1948 #endif 1949 1950 if (args_size >= 0) { 1951 m->set_size_of_parameters(args_size); 1952 } else { 1953 m->compute_size_of_parameters(THREAD); 1954 } 1955 #ifdef ASSERT 1956 if (args_size >= 0) { 1957 m->compute_size_of_parameters(THREAD); 1958 assert(args_size == m->size_of_parameters(), ""); 1959 } 1960 #endif 1961 1962 // Fill in code attribute information 1963 m->set_max_stack(max_stack); 1964 m->set_max_locals(max_locals); 1965 m->constMethod()->set_stackmap_data(stackmap_data()); 1966 1967 /** 1968 * The exception_table field is the flag used to indicate 1969 * that the methodOop and it's associated constMethodOop are partially 1970 * initialized and thus are exempt from pre/post GC verification. Once 1971 * the field is set, the oops are considered fully initialized so make 1972 * sure that the oops can pass verification when this field is set. 1973 */ 1974 m->set_exception_table(exception_handlers()); 1975 1976 // Copy byte codes 1977 m->set_code(code_start); 1978 1979 // Copy line number table 1980 if (linenumber_table != NULL) { 1981 memcpy(m->compressed_linenumber_table(), 1982 linenumber_table->buffer(), linenumber_table_length); 1983 } 1984 1985 // Copy checked exceptions 1986 if (checked_exceptions_length > 0) { 1987 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 1988 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 1989 } 1990 1991 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1992 * 1993 * Rules for LVT's and LVTT's are: 1994 * - There can be any number of LVT's and LVTT's. 1995 * - If there are n LVT's, it is the same as if there was just 1996 * one LVT containing all the entries from the n LVT's. 1997 * - There may be no more than one LVT entry per local variable. 1998 * Two LVT entries are 'equal' if these fields are the same: 1999 * start_pc, length, name, slot 2000 * - There may be no more than one LVTT entry per each LVT entry. 2001 * Each LVTT entry has to match some LVT entry. 2002 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2003 */ 2004 if (total_lvt_length > 0) { 2005 int tbl_no, idx; 2006 2007 promoted_flags->set_has_localvariable_table(); 2008 2009 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE); 2010 initialize_hashtable(lvt_Hash); 2011 2012 // To fill LocalVariableTable in 2013 Classfile_LVT_Element* cf_lvt; 2014 LocalVariableTableElement* lvt = m->localvariable_table_start(); 2015 2016 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2017 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2018 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2019 copy_lvt_element(&cf_lvt[idx], lvt); 2020 // If no duplicates, add LVT elem in hashtable lvt_Hash. 2021 if (LVT_put_after_lookup(lvt, lvt_Hash) == false 2022 && _need_verify 2023 && _major_version >= JAVA_1_5_VERSION ) { 2024 clear_hashtable(lvt_Hash); 2025 classfile_parse_error("Duplicated LocalVariableTable attribute " 2026 "entry for '%s' in class file %s", 2027 cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2028 CHECK_(nullHandle)); 2029 } 2030 } 2031 } 2032 2033 // To merge LocalVariableTable and LocalVariableTypeTable 2034 Classfile_LVT_Element* cf_lvtt; 2035 LocalVariableTableElement lvtt_elem; 2036 2037 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2038 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2039 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2040 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2041 int index = hash(&lvtt_elem); 2042 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash); 2043 if (entry == NULL) { 2044 if (_need_verify) { 2045 clear_hashtable(lvt_Hash); 2046 classfile_parse_error("LVTT entry for '%s' in class file %s " 2047 "does not match any LVT entry", 2048 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2049 CHECK_(nullHandle)); 2050 } 2051 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) { 2052 clear_hashtable(lvt_Hash); 2053 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2054 "entry for '%s' in class file %s", 2055 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2056 CHECK_(nullHandle)); 2057 } else { 2058 // to add generic signatures into LocalVariableTable 2059 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; 2060 } 2061 } 2062 } 2063 clear_hashtable(lvt_Hash); 2064 } 2065 2066 *method_annotations = assemble_annotations(runtime_visible_annotations, 2067 runtime_visible_annotations_length, 2068 runtime_invisible_annotations, 2069 runtime_invisible_annotations_length, 2070 CHECK_(nullHandle)); 2071 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations, 2072 runtime_visible_parameter_annotations_length, 2073 runtime_invisible_parameter_annotations, 2074 runtime_invisible_parameter_annotations_length, 2075 CHECK_(nullHandle)); 2076 *method_default_annotations = assemble_annotations(annotation_default, 2077 annotation_default_length, 2078 NULL, 2079 0, 2080 CHECK_(nullHandle)); 2081 2082 if (name == vmSymbols::finalize_method_name() && 2083 signature == vmSymbols::void_method_signature()) { 2084 if (m->is_empty_method()) { 2085 _has_empty_finalizer = true; 2086 } else { 2087 _has_finalizer = true; 2088 } 2089 } 2090 if (name == vmSymbols::object_initializer_name() && 2091 signature == vmSymbols::void_method_signature() && 2092 m->is_vanilla_constructor()) { 2093 _has_vanilla_constructor = true; 2094 } 2095 2096 if (EnableMethodHandles && (m->is_method_handle_invoke() || 2097 m->is_method_handle_adapter())) { 2098 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(), 2099 "Method handle invokers must be defined internally to the VM", nullHandle); 2100 } 2101 2102 return m; 2103 } 2104 2105 2106 // The promoted_flags parameter is used to pass relevant access_flags 2107 // from the methods back up to the containing klass. These flag values 2108 // are added to klass's access_flags. 2109 2110 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface, 2111 AccessFlags* promoted_flags, 2112 bool* has_final_method, 2113 objArrayOop* methods_annotations_oop, 2114 objArrayOop* methods_parameter_annotations_oop, 2115 objArrayOop* methods_default_annotations_oop, 2116 TRAPS) { 2117 ClassFileStream* cfs = stream(); 2118 objArrayHandle nullHandle; 2119 typeArrayHandle method_annotations; 2120 typeArrayHandle method_parameter_annotations; 2121 typeArrayHandle method_default_annotations; 2122 cfs->guarantee_more(2, CHECK_(nullHandle)); // length 2123 u2 length = cfs->get_u2_fast(); 2124 if (length == 0) { 2125 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 2126 } else { 2127 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 2128 objArrayHandle methods(THREAD, m); 2129 HandleMark hm(THREAD); 2130 objArrayHandle methods_annotations; 2131 objArrayHandle methods_parameter_annotations; 2132 objArrayHandle methods_default_annotations; 2133 for (int index = 0; index < length; index++) { 2134 methodHandle method = parse_method(cp, is_interface, 2135 promoted_flags, 2136 &method_annotations, 2137 &method_parameter_annotations, 2138 &method_default_annotations, 2139 CHECK_(nullHandle)); 2140 if (method->is_final()) { 2141 *has_final_method = true; 2142 } 2143 methods->obj_at_put(index, method()); 2144 if (method_annotations.not_null()) { 2145 if (methods_annotations.is_null()) { 2146 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 2147 methods_annotations = objArrayHandle(THREAD, md); 2148 } 2149 methods_annotations->obj_at_put(index, method_annotations()); 2150 } 2151 if (method_parameter_annotations.not_null()) { 2152 if (methods_parameter_annotations.is_null()) { 2153 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 2154 methods_parameter_annotations = objArrayHandle(THREAD, md); 2155 } 2156 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations()); 2157 } 2158 if (method_default_annotations.not_null()) { 2159 if (methods_default_annotations.is_null()) { 2160 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 2161 methods_default_annotations = objArrayHandle(THREAD, md); 2162 } 2163 methods_default_annotations->obj_at_put(index, method_default_annotations()); 2164 } 2165 } 2166 if (_need_verify && length > 1) { 2167 // Check duplicated methods 2168 ResourceMark rm(THREAD); 2169 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2170 THREAD, NameSigHash*, HASH_ROW_SIZE); 2171 initialize_hashtable(names_and_sigs); 2172 bool dup = false; 2173 { 2174 debug_only(No_Safepoint_Verifier nsv;) 2175 for (int i = 0; i < length; i++) { 2176 methodOop m = (methodOop)methods->obj_at(i); 2177 // If no duplicates, add name/signature in hashtable names_and_sigs. 2178 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 2179 dup = true; 2180 break; 2181 } 2182 } 2183 } 2184 if (dup) { 2185 classfile_parse_error("Duplicate method name&signature in class file %s", 2186 CHECK_(nullHandle)); 2187 } 2188 } 2189 2190 *methods_annotations_oop = methods_annotations(); 2191 *methods_parameter_annotations_oop = methods_parameter_annotations(); 2192 *methods_default_annotations_oop = methods_default_annotations(); 2193 2194 return methods; 2195 } 2196 } 2197 2198 2199 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods, 2200 objArrayHandle methods_annotations, 2201 objArrayHandle methods_parameter_annotations, 2202 objArrayHandle methods_default_annotations, 2203 TRAPS) { 2204 typeArrayHandle nullHandle; 2205 int length = methods()->length(); 2206 // If JVMTI original method ordering is enabled we have to 2207 // remember the original class file ordering. 2208 // We temporarily use the vtable_index field in the methodOop to store the 2209 // class file index, so we can read in after calling qsort. 2210 if (JvmtiExport::can_maintain_original_method_order()) { 2211 for (int index = 0; index < length; index++) { 2212 methodOop m = methodOop(methods->obj_at(index)); 2213 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2214 m->set_vtable_index(index); 2215 } 2216 } 2217 // Sort method array by ascending method name (for faster lookups & vtable construction) 2218 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2219 methodOopDesc::sort_methods(methods(), 2220 methods_annotations(), 2221 methods_parameter_annotations(), 2222 methods_default_annotations()); 2223 2224 // If JVMTI original method ordering is enabled construct int array remembering the original ordering 2225 if (JvmtiExport::can_maintain_original_method_order()) { 2226 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle)); 2227 typeArrayHandle method_ordering(THREAD, new_ordering); 2228 for (int index = 0; index < length; index++) { 2229 methodOop m = methodOop(methods->obj_at(index)); 2230 int old_index = m->vtable_index(); 2231 assert(old_index >= 0 && old_index < length, "invalid method index"); 2232 method_ordering->int_at_put(index, old_index); 2233 m->set_vtable_index(methodOopDesc::invalid_vtable_index); 2234 } 2235 return method_ordering; 2236 } else { 2237 return typeArrayHandle(THREAD, Universe::the_empty_int_array()); 2238 } 2239 } 2240 2241 2242 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2243 ClassFileStream* cfs = stream(); 2244 cfs->guarantee_more(2, CHECK); // sourcefile_index 2245 u2 sourcefile_index = cfs->get_u2_fast(); 2246 check_property( 2247 valid_cp_range(sourcefile_index, cp->length()) && 2248 cp->tag_at(sourcefile_index).is_utf8(), 2249 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2250 sourcefile_index, CHECK); 2251 k->set_source_file_name(cp->symbol_at(sourcefile_index)); 2252 } 2253 2254 2255 2256 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp, 2257 instanceKlassHandle k, 2258 int length, TRAPS) { 2259 ClassFileStream* cfs = stream(); 2260 u1* sde_buffer = cfs->get_u1_buffer(); 2261 assert(sde_buffer != NULL, "null sde buffer"); 2262 2263 // Don't bother storing it if there is no way to retrieve it 2264 if (JvmtiExport::can_get_source_debug_extension()) { 2265 // Optimistically assume that only 1 byte UTF format is used 2266 // (common case) 2267 TempNewSymbol sde_symbol = SymbolTable::new_symbol((const char*)sde_buffer, length, CHECK); 2268 k->set_source_debug_extension(sde_symbol); 2269 // Note that set_source_debug_extension() increments the reference count 2270 // for its copy of the Symbol*, so use a TempNewSymbol here. 2271 } 2272 // Got utf8 string, set stream position forward 2273 cfs->skip_u1(length, CHECK); 2274 } 2275 2276 2277 // Inner classes can be static, private or protected (classic VM does this) 2278 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2279 2280 // Return number of classes in the inner classes attribute table 2281 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2282 ClassFileStream* cfs = stream(); 2283 cfs->guarantee_more(2, CHECK_0); // length 2284 u2 length = cfs->get_u2_fast(); 2285 2286 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags] 2287 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0); 2288 typeArrayHandle inner_classes(THREAD, ic); 2289 int index = 0; 2290 int cp_size = cp->length(); 2291 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2292 for (int n = 0; n < length; n++) { 2293 // Inner class index 2294 u2 inner_class_info_index = cfs->get_u2_fast(); 2295 check_property( 2296 inner_class_info_index == 0 || 2297 (valid_cp_range(inner_class_info_index, cp_size) && 2298 is_klass_reference(cp, inner_class_info_index)), 2299 "inner_class_info_index %u has bad constant type in class file %s", 2300 inner_class_info_index, CHECK_0); 2301 // Outer class index 2302 u2 outer_class_info_index = cfs->get_u2_fast(); 2303 check_property( 2304 outer_class_info_index == 0 || 2305 (valid_cp_range(outer_class_info_index, cp_size) && 2306 is_klass_reference(cp, outer_class_info_index)), 2307 "outer_class_info_index %u has bad constant type in class file %s", 2308 outer_class_info_index, CHECK_0); 2309 // Inner class name 2310 u2 inner_name_index = cfs->get_u2_fast(); 2311 check_property( 2312 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) && 2313 cp->tag_at(inner_name_index).is_utf8()), 2314 "inner_name_index %u has bad constant type in class file %s", 2315 inner_name_index, CHECK_0); 2316 if (_need_verify) { 2317 guarantee_property(inner_class_info_index != outer_class_info_index, 2318 "Class is both outer and inner class in class file %s", CHECK_0); 2319 } 2320 // Access flags 2321 AccessFlags inner_access_flags; 2322 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2323 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2324 // Set abstract bit for old class files for backward compatibility 2325 flags |= JVM_ACC_ABSTRACT; 2326 } 2327 verify_legal_class_modifiers(flags, CHECK_0); 2328 inner_access_flags.set_flags(flags); 2329 2330 inner_classes->short_at_put(index++, inner_class_info_index); 2331 inner_classes->short_at_put(index++, outer_class_info_index); 2332 inner_classes->short_at_put(index++, inner_name_index); 2333 inner_classes->short_at_put(index++, inner_access_flags.as_short()); 2334 } 2335 2336 // 4347400: make sure there's no duplicate entry in the classes array 2337 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2338 for(int i = 0; i < inner_classes->length(); i += 4) { 2339 for(int j = i + 4; j < inner_classes->length(); j += 4) { 2340 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) || 2341 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) || 2342 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) || 2343 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)), 2344 "Duplicate entry in InnerClasses in class file %s", 2345 CHECK_0); 2346 } 2347 } 2348 } 2349 2350 // Update instanceKlass with inner class info. 2351 k->set_inner_classes(inner_classes()); 2352 return length; 2353 } 2354 2355 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2356 k->set_is_synthetic(); 2357 } 2358 2359 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2360 ClassFileStream* cfs = stream(); 2361 u2 signature_index = cfs->get_u2(CHECK); 2362 check_property( 2363 valid_cp_range(signature_index, cp->length()) && 2364 cp->tag_at(signature_index).is_utf8(), 2365 "Invalid constant pool index %u in Signature attribute in class file %s", 2366 signature_index, CHECK); 2367 k->set_generic_signature(cp->symbol_at(signature_index)); 2368 } 2369 2370 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(constantPoolHandle cp, instanceKlassHandle k, 2371 u4 attribute_byte_length, TRAPS) { 2372 ClassFileStream* cfs = stream(); 2373 u1* current_start = cfs->current(); 2374 2375 cfs->guarantee_more(2, CHECK); // length 2376 int attribute_array_length = cfs->get_u2_fast(); 2377 2378 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 2379 "Short length on BootstrapMethods in class file %s", 2380 CHECK); 2381 2382 // The attribute contains a counted array of counted tuples of shorts, 2383 // represending bootstrap specifiers: 2384 // length*{bootstrap_method_index, argument_count*{argument_index}} 2385 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 2386 // operand_count = number of shorts in attr, except for leading length 2387 2388 // The attribute is copied into a short[] array. 2389 // The array begins with a series of short[2] pairs, one for each tuple. 2390 int index_size = (attribute_array_length * 2); 2391 2392 typeArrayOop operands_oop = oopFactory::new_permanent_intArray(index_size + operand_count, CHECK); 2393 typeArrayHandle operands(THREAD, operands_oop); 2394 operands_oop = NULL; // tidy 2395 2396 int operand_fill_index = index_size; 2397 int cp_size = cp->length(); 2398 2399 for (int n = 0; n < attribute_array_length; n++) { 2400 // Store a 32-bit offset into the header of the operand array. 2401 assert(constantPoolOopDesc::operand_offset_at(operands(), n) == 0, ""); 2402 constantPoolOopDesc::operand_offset_at_put(operands(), n, operand_fill_index); 2403 2404 // Read a bootstrap specifier. 2405 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 2406 u2 bootstrap_method_index = cfs->get_u2_fast(); 2407 u2 argument_count = cfs->get_u2_fast(); 2408 check_property( 2409 valid_cp_range(bootstrap_method_index, cp_size) && 2410 cp->tag_at(bootstrap_method_index).is_method_handle(), 2411 "bootstrap_method_index %u has bad constant type in class file %s", 2412 bootstrap_method_index, 2413 CHECK); 2414 operands->short_at_put(operand_fill_index++, bootstrap_method_index); 2415 operands->short_at_put(operand_fill_index++, argument_count); 2416 2417 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 2418 for (int j = 0; j < argument_count; j++) { 2419 u2 argument_index = cfs->get_u2_fast(); 2420 check_property( 2421 valid_cp_range(argument_index, cp_size) && 2422 cp->tag_at(argument_index).is_loadable_constant(), 2423 "argument_index %u has bad constant type in class file %s", 2424 argument_index, 2425 CHECK); 2426 operands->short_at_put(operand_fill_index++, argument_index); 2427 } 2428 } 2429 2430 assert(operand_fill_index == operands()->length(), "exact fill"); 2431 assert(constantPoolOopDesc::operand_array_length(operands()) == attribute_array_length, "correct decode"); 2432 2433 u1* current_end = cfs->current(); 2434 guarantee_property(current_end == current_start + attribute_byte_length, 2435 "Bad length on BootstrapMethods in class file %s", 2436 CHECK); 2437 2438 cp->set_operands(operands()); 2439 } 2440 2441 2442 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2443 ClassFileStream* cfs = stream(); 2444 // Set inner classes attribute to default sentinel 2445 k->set_inner_classes(Universe::the_empty_short_array()); 2446 cfs->guarantee_more(2, CHECK); // attributes_count 2447 u2 attributes_count = cfs->get_u2_fast(); 2448 bool parsed_sourcefile_attribute = false; 2449 bool parsed_innerclasses_attribute = false; 2450 bool parsed_enclosingmethod_attribute = false; 2451 bool parsed_bootstrap_methods_attribute = false; 2452 u1* runtime_visible_annotations = NULL; 2453 int runtime_visible_annotations_length = 0; 2454 u1* runtime_invisible_annotations = NULL; 2455 int runtime_invisible_annotations_length = 0; 2456 // Iterate over attributes 2457 while (attributes_count--) { 2458 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2459 u2 attribute_name_index = cfs->get_u2_fast(); 2460 u4 attribute_length = cfs->get_u4_fast(); 2461 check_property( 2462 valid_cp_range(attribute_name_index, cp->length()) && 2463 cp->tag_at(attribute_name_index).is_utf8(), 2464 "Attribute name has bad constant pool index %u in class file %s", 2465 attribute_name_index, CHECK); 2466 Symbol* tag = cp->symbol_at(attribute_name_index); 2467 if (tag == vmSymbols::tag_source_file()) { 2468 // Check for SourceFile tag 2469 if (_need_verify) { 2470 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2471 } 2472 if (parsed_sourcefile_attribute) { 2473 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2474 } else { 2475 parsed_sourcefile_attribute = true; 2476 } 2477 parse_classfile_sourcefile_attribute(cp, k, CHECK); 2478 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2479 // Check for SourceDebugExtension tag 2480 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK); 2481 } else if (tag == vmSymbols::tag_inner_classes()) { 2482 // Check for InnerClasses tag 2483 if (parsed_innerclasses_attribute) { 2484 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2485 } else { 2486 parsed_innerclasses_attribute = true; 2487 } 2488 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK); 2489 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2490 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 2491 "Wrong InnerClasses attribute length in class file %s", CHECK); 2492 } 2493 } else if (tag == vmSymbols::tag_synthetic()) { 2494 // Check for Synthetic tag 2495 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2496 if (attribute_length != 0) { 2497 classfile_parse_error( 2498 "Invalid Synthetic classfile attribute length %u in class file %s", 2499 attribute_length, CHECK); 2500 } 2501 parse_classfile_synthetic_attribute(cp, k, CHECK); 2502 } else if (tag == vmSymbols::tag_deprecated()) { 2503 // Check for Deprecatd tag - 4276120 2504 if (attribute_length != 0) { 2505 classfile_parse_error( 2506 "Invalid Deprecated classfile attribute length %u in class file %s", 2507 attribute_length, CHECK); 2508 } 2509 } else if (_major_version >= JAVA_1_5_VERSION) { 2510 if (tag == vmSymbols::tag_signature()) { 2511 if (attribute_length != 2) { 2512 classfile_parse_error( 2513 "Wrong Signature attribute length %u in class file %s", 2514 attribute_length, CHECK); 2515 } 2516 parse_classfile_signature_attribute(cp, k, CHECK); 2517 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2518 runtime_visible_annotations_length = attribute_length; 2519 runtime_visible_annotations = cfs->get_u1_buffer(); 2520 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2521 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2522 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) { 2523 runtime_invisible_annotations_length = attribute_length; 2524 runtime_invisible_annotations = cfs->get_u1_buffer(); 2525 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2526 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 2527 } else if (tag == vmSymbols::tag_enclosing_method()) { 2528 if (parsed_enclosingmethod_attribute) { 2529 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 2530 } else { 2531 parsed_enclosingmethod_attribute = true; 2532 } 2533 cfs->guarantee_more(4, CHECK); // class_index, method_index 2534 u2 class_index = cfs->get_u2_fast(); 2535 u2 method_index = cfs->get_u2_fast(); 2536 if (class_index == 0) { 2537 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 2538 } 2539 // Validate the constant pool indices and types 2540 if (!cp->is_within_bounds(class_index) || 2541 !is_klass_reference(cp, class_index)) { 2542 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 2543 } 2544 if (method_index != 0 && 2545 (!cp->is_within_bounds(method_index) || 2546 !cp->tag_at(method_index).is_name_and_type())) { 2547 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 2548 } 2549 k->set_enclosing_method_indices(class_index, method_index); 2550 } else if (tag == vmSymbols::tag_bootstrap_methods() && 2551 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 2552 if (parsed_bootstrap_methods_attribute) 2553 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 2554 parsed_bootstrap_methods_attribute = true; 2555 parse_classfile_bootstrap_methods_attribute(cp, k, attribute_length, CHECK); 2556 } else { 2557 // Unknown attribute 2558 cfs->skip_u1(attribute_length, CHECK); 2559 } 2560 } else { 2561 // Unknown attribute 2562 cfs->skip_u1(attribute_length, CHECK); 2563 } 2564 } 2565 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations, 2566 runtime_visible_annotations_length, 2567 runtime_invisible_annotations, 2568 runtime_invisible_annotations_length, 2569 CHECK); 2570 k->set_class_annotations(annotations()); 2571 2572 if (_max_bootstrap_specifier_index >= 0) { 2573 guarantee_property(parsed_bootstrap_methods_attribute, 2574 "Missing BootstrapMethods attribute in class file %s", CHECK); 2575 } 2576 } 2577 2578 2579 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 2580 int runtime_visible_annotations_length, 2581 u1* runtime_invisible_annotations, 2582 int runtime_invisible_annotations_length, TRAPS) { 2583 typeArrayHandle annotations; 2584 if (runtime_visible_annotations != NULL || 2585 runtime_invisible_annotations != NULL) { 2586 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length + 2587 runtime_invisible_annotations_length, CHECK_(annotations)); 2588 annotations = typeArrayHandle(THREAD, anno); 2589 if (runtime_visible_annotations != NULL) { 2590 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length); 2591 } 2592 if (runtime_invisible_annotations != NULL) { 2593 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length); 2594 } 2595 } 2596 return annotations; 2597 } 2598 2599 2600 static void initialize_static_field(fieldDescriptor* fd, TRAPS) { 2601 KlassHandle h_k (THREAD, fd->field_holder()); 2602 assert(h_k.not_null() && fd->is_static(), "just checking"); 2603 if (fd->has_initial_value()) { 2604 BasicType t = fd->field_type(); 2605 switch (t) { 2606 case T_BYTE: 2607 h_k()->byte_field_put(fd->offset(), fd->int_initial_value()); 2608 break; 2609 case T_BOOLEAN: 2610 h_k()->bool_field_put(fd->offset(), fd->int_initial_value()); 2611 break; 2612 case T_CHAR: 2613 h_k()->char_field_put(fd->offset(), fd->int_initial_value()); 2614 break; 2615 case T_SHORT: 2616 h_k()->short_field_put(fd->offset(), fd->int_initial_value()); 2617 break; 2618 case T_INT: 2619 h_k()->int_field_put(fd->offset(), fd->int_initial_value()); 2620 break; 2621 case T_FLOAT: 2622 h_k()->float_field_put(fd->offset(), fd->float_initial_value()); 2623 break; 2624 case T_DOUBLE: 2625 h_k()->double_field_put(fd->offset(), fd->double_initial_value()); 2626 break; 2627 case T_LONG: 2628 h_k()->long_field_put(fd->offset(), fd->long_initial_value()); 2629 break; 2630 case T_OBJECT: 2631 { 2632 #ifdef ASSERT 2633 TempNewSymbol sym = SymbolTable::new_symbol("Ljava/lang/String;", CHECK); 2634 assert(fd->signature() == sym, "just checking"); 2635 #endif 2636 oop string = fd->string_initial_value(CHECK); 2637 h_k()->obj_field_put(fd->offset(), string); 2638 } 2639 break; 2640 default: 2641 THROW_MSG(vmSymbols::java_lang_ClassFormatError(), 2642 "Illegal ConstantValue attribute in class file"); 2643 } 2644 } 2645 } 2646 2647 2648 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr, 2649 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) { 2650 // This code is for compatibility with earlier jdk's that do not 2651 // have the "discovered" field in java.lang.ref.Reference. For 1.5 2652 // the check for the "discovered" field should issue a warning if 2653 // the field is not found. For 1.6 this code should be issue a 2654 // fatal error if the "discovered" field is not found. 2655 // 2656 // Increment fac.nonstatic_oop_count so that the start of the 2657 // next type of non-static oops leaves room for the fake oop. 2658 // Do not increment next_nonstatic_oop_offset so that the 2659 // fake oop is place after the java.lang.ref.Reference oop 2660 // fields. 2661 // 2662 // Check the fields in java.lang.ref.Reference for the "discovered" 2663 // field. If it is not present, artifically create a field for it. 2664 // This allows this VM to run on early JDK where the field is not 2665 // present. 2666 int reference_sig_index = 0; 2667 int reference_name_index = 0; 2668 int reference_index = 0; 2669 int extra = java_lang_ref_Reference::number_of_fake_oop_fields; 2670 const int n = (*fields_ptr)()->length(); 2671 for (int i = 0; i < n; i += instanceKlass::next_offset ) { 2672 int name_index = 2673 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset); 2674 int sig_index = 2675 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset); 2676 Symbol* f_name = cp->symbol_at(name_index); 2677 Symbol* f_sig = cp->symbol_at(sig_index); 2678 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) { 2679 // Save the index for reference signature for later use. 2680 // The fake discovered field does not entries in the 2681 // constant pool so the index for its signature cannot 2682 // be extracted from the constant pool. It will need 2683 // later, however. It's signature is vmSymbols::reference_signature() 2684 // so same an index for that signature. 2685 reference_sig_index = sig_index; 2686 reference_name_index = name_index; 2687 reference_index = i; 2688 } 2689 if (f_name == vmSymbols::reference_discovered_name() && 2690 f_sig == vmSymbols::reference_signature()) { 2691 // The values below are fake but will force extra 2692 // non-static oop fields and a corresponding non-static 2693 // oop map block to be allocated. 2694 extra = 0; 2695 break; 2696 } 2697 } 2698 if (extra != 0) { 2699 fac_ptr->nonstatic_oop_count += extra; 2700 // Add the additional entry to "fields" so that the klass 2701 // contains the "discoverd" field and the field will be initialized 2702 // in instances of the object. 2703 int fields_with_fix_length = (*fields_ptr)()->length() + 2704 instanceKlass::next_offset; 2705 typeArrayOop ff = oopFactory::new_permanent_shortArray( 2706 fields_with_fix_length, CHECK); 2707 typeArrayHandle fields_with_fix(THREAD, ff); 2708 2709 // Take everything from the original but the length. 2710 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) { 2711 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx)); 2712 } 2713 2714 // Add the fake field at the end. 2715 int i = (*fields_ptr)->length(); 2716 // There is no name index for the fake "discovered" field nor 2717 // signature but a signature is needed so that the field will 2718 // be properly initialized. Use one found for 2719 // one of the other reference fields. Be sure the index for the 2720 // name is 0. In fieldDescriptor::initialize() the index of the 2721 // name is checked. That check is by passed for the last nonstatic 2722 // oop field in a java.lang.ref.Reference which is assumed to be 2723 // this artificial "discovered" field. An assertion checks that 2724 // the name index is 0. 2725 assert(reference_index != 0, "Missing signature for reference"); 2726 2727 int j; 2728 for (j = 0; j < instanceKlass::next_offset; j++) { 2729 fields_with_fix->ushort_at_put(i + j, 2730 (*fields_ptr)->ushort_at(reference_index +j)); 2731 } 2732 // Clear the public access flag and set the private access flag. 2733 short flags; 2734 flags = 2735 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset); 2736 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set"); 2737 flags = flags & (~JVM_ACC_PUBLIC); 2738 flags = flags | JVM_ACC_PRIVATE; 2739 AccessFlags access_flags; 2740 access_flags.set_flags(flags); 2741 assert(!access_flags.is_public(), "Failed to clear public flag"); 2742 assert(access_flags.is_private(), "Failed to set private flag"); 2743 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset, 2744 flags); 2745 2746 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset) 2747 == reference_name_index, "The fake reference name is incorrect"); 2748 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset) 2749 == reference_sig_index, "The fake reference signature is incorrect"); 2750 // The type of the field is stored in the low_offset entry during 2751 // parsing. 2752 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) == 2753 NONSTATIC_OOP, "The fake reference type is incorrect"); 2754 2755 // "fields" is allocated in the permanent generation. Disgard 2756 // it and let it be collected. 2757 (*fields_ptr) = fields_with_fix; 2758 } 2759 return; 2760 } 2761 2762 2763 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr, 2764 FieldAllocationCount *fac_ptr, TRAPS) { 2765 // Add fake fields for java.lang.Class instances 2766 // 2767 // This is not particularly nice. We should consider adding a 2768 // private transient object field at the Java level to 2769 // java.lang.Class. Alternatively we could add a subclass of 2770 // instanceKlass which provides an accessor and size computer for 2771 // this field, but that appears to be more code than this hack. 2772 // 2773 // NOTE that we wedge these in at the beginning rather than the 2774 // end of the object because the Class layout changed between JDK 2775 // 1.3 and JDK 1.4 with the new reflection implementation; some 2776 // nonstatic oop fields were added at the Java level. The offsets 2777 // of these fake fields can't change between these two JDK 2778 // versions because when the offsets are computed at bootstrap 2779 // time we don't know yet which version of the JDK we're running in. 2780 2781 // The values below are fake but will force two non-static oop fields and 2782 // a corresponding non-static oop map block to be allocated. 2783 const int extra = java_lang_Class::number_of_fake_oop_fields; 2784 fac_ptr->nonstatic_oop_count += extra; 2785 } 2786 2787 2788 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) { 2789 // Cause the extra fake fields in java.lang.Class to show up before 2790 // the Java fields for layout compatibility between 1.3 and 1.4 2791 // Incrementing next_nonstatic_oop_offset here advances the 2792 // location where the real java fields are placed. 2793 const int extra = java_lang_Class::number_of_fake_oop_fields; 2794 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize); 2795 } 2796 2797 2798 // Force MethodHandle.vmentry to be an unmanaged pointer. 2799 // There is no way for a classfile to express this, so we must help it. 2800 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp, 2801 typeArrayHandle fields, 2802 FieldAllocationCount *fac_ptr, 2803 TRAPS) { 2804 // Add fake fields for java.dyn.MethodHandle instances 2805 // 2806 // This is not particularly nice, but since there is no way to express 2807 // a native wordSize field in Java, we must do it at this level. 2808 2809 if (!EnableMethodHandles) return; 2810 2811 int word_sig_index = 0; 2812 const int cp_size = cp->length(); 2813 for (int index = 1; index < cp_size; index++) { 2814 if (cp->tag_at(index).is_utf8() && 2815 cp->symbol_at(index) == vmSymbols::machine_word_signature()) { 2816 word_sig_index = index; 2817 break; 2818 } 2819 } 2820 2821 if (word_sig_index == 0) 2822 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), 2823 "missing I or J signature (for vmentry) in java.dyn.MethodHandle"); 2824 2825 // Find vmentry field and change the signature. 2826 bool found_vmentry = false; 2827 for (int i = 0; i < fields->length(); i += instanceKlass::next_offset) { 2828 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset); 2829 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset); 2830 int acc_flags = fields->ushort_at(i + instanceKlass::access_flags_offset); 2831 Symbol* f_name = cp->symbol_at(name_index); 2832 Symbol* f_sig = cp->symbol_at(sig_index); 2833 if (f_name == vmSymbols::vmentry_name() && (acc_flags & JVM_ACC_STATIC) == 0) { 2834 if (f_sig == vmSymbols::machine_word_signature()) { 2835 // If the signature of vmentry is already changed, we're done. 2836 found_vmentry = true; 2837 break; 2838 } 2839 else if (f_sig == vmSymbols::byte_signature()) { 2840 // Adjust the field type from byte to an unmanaged pointer. 2841 assert(fac_ptr->nonstatic_byte_count > 0, ""); 2842 fac_ptr->nonstatic_byte_count -= 1; 2843 2844 fields->ushort_at_put(i + instanceKlass::signature_index_offset, word_sig_index); 2845 assert(wordSize == longSize || wordSize == jintSize, "ILP32 or LP64"); 2846 if (wordSize == longSize) fac_ptr->nonstatic_double_count += 1; 2847 else fac_ptr->nonstatic_word_count += 1; 2848 2849 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset); 2850 assert(atype == NONSTATIC_BYTE, ""); 2851 FieldAllocationType new_atype = (wordSize == longSize) ? NONSTATIC_DOUBLE : NONSTATIC_WORD; 2852 fields->ushort_at_put(i + instanceKlass::low_offset, new_atype); 2853 2854 found_vmentry = true; 2855 break; 2856 } 2857 } 2858 } 2859 2860 if (!found_vmentry) 2861 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), 2862 "missing vmentry byte field in java.dyn.MethodHandle"); 2863 } 2864 2865 2866 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name, 2867 Handle class_loader, 2868 Handle protection_domain, 2869 KlassHandle host_klass, 2870 GrowableArray<Handle>* cp_patches, 2871 TempNewSymbol& parsed_name, 2872 bool verify, 2873 TRAPS) { 2874 // So that JVMTI can cache class file in the state before retransformable agents 2875 // have modified it 2876 unsigned char *cached_class_file_bytes = NULL; 2877 jint cached_class_file_length; 2878 2879 ClassFileStream* cfs = stream(); 2880 // Timing 2881 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 2882 JavaThread* jt = (JavaThread*) THREAD; 2883 2884 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), 2885 ClassLoader::perf_class_parse_selftime(), 2886 NULL, 2887 jt->get_thread_stat()->perf_recursion_counts_addr(), 2888 jt->get_thread_stat()->perf_timers_addr(), 2889 PerfClassTraceTime::PARSE_CLASS); 2890 2891 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false; 2892 _max_bootstrap_specifier_index = -1; 2893 2894 if (JvmtiExport::should_post_class_file_load_hook()) { 2895 unsigned char* ptr = cfs->buffer(); 2896 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 2897 2898 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain, 2899 &ptr, &end_ptr, 2900 &cached_class_file_bytes, 2901 &cached_class_file_length); 2902 2903 if (ptr != cfs->buffer()) { 2904 // JVMTI agent has modified class file data. 2905 // Set new class file stream using JVMTI agent modified 2906 // class file data. 2907 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 2908 set_stream(cfs); 2909 } 2910 } 2911 2912 _host_klass = host_klass; 2913 _cp_patches = cp_patches; 2914 2915 instanceKlassHandle nullHandle; 2916 2917 // Figure out whether we can skip format checking (matching classic VM behavior) 2918 _need_verify = Verifier::should_verify_for(class_loader(), verify); 2919 2920 // Set the verify flag in stream 2921 cfs->set_verify(_need_verify); 2922 2923 // Save the class file name for easier error message printing. 2924 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name(); 2925 2926 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 2927 // Magic value 2928 u4 magic = cfs->get_u4_fast(); 2929 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 2930 "Incompatible magic value %u in class file %s", 2931 magic, CHECK_(nullHandle)); 2932 2933 // Version numbers 2934 u2 minor_version = cfs->get_u2_fast(); 2935 u2 major_version = cfs->get_u2_fast(); 2936 2937 // Check version numbers - we check this even with verifier off 2938 if (!is_supported_version(major_version, minor_version)) { 2939 if (name == NULL) { 2940 Exceptions::fthrow( 2941 THREAD_AND_LOCATION, 2942 vmSymbols::java_lang_UnsupportedClassVersionError(), 2943 "Unsupported major.minor version %u.%u", 2944 major_version, 2945 minor_version); 2946 } else { 2947 ResourceMark rm(THREAD); 2948 Exceptions::fthrow( 2949 THREAD_AND_LOCATION, 2950 vmSymbols::java_lang_UnsupportedClassVersionError(), 2951 "%s : Unsupported major.minor version %u.%u", 2952 name->as_C_string(), 2953 major_version, 2954 minor_version); 2955 } 2956 return nullHandle; 2957 } 2958 2959 _major_version = major_version; 2960 _minor_version = minor_version; 2961 2962 2963 // Check if verification needs to be relaxed for this class file 2964 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 2965 _relax_verify = Verifier::relax_verify_for(class_loader()); 2966 2967 // Constant pool 2968 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 2969 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up. 2970 2971 int cp_size = cp->length(); 2972 2973 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 2974 2975 // Access flags 2976 AccessFlags access_flags; 2977 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 2978 2979 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2980 // Set abstract bit for old class files for backward compatibility 2981 flags |= JVM_ACC_ABSTRACT; 2982 } 2983 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 2984 access_flags.set_flags(flags); 2985 2986 // This class and superclass 2987 instanceKlassHandle super_klass; 2988 u2 this_class_index = cfs->get_u2_fast(); 2989 check_property( 2990 valid_cp_range(this_class_index, cp_size) && 2991 cp->tag_at(this_class_index).is_unresolved_klass(), 2992 "Invalid this class index %u in constant pool in class file %s", 2993 this_class_index, CHECK_(nullHandle)); 2994 2995 Symbol* class_name = cp->unresolved_klass_at(this_class_index); 2996 assert(class_name != NULL, "class_name can't be null"); 2997 2998 // It's important to set parsed_name *before* resolving the super class. 2999 // (it's used for cleanup by the caller if parsing fails) 3000 parsed_name = class_name; 3001 // parsed_name is returned and can be used if there's an error, so add to 3002 // its reference count. Caller will decrement the refcount. 3003 parsed_name->increment_refcount(); 3004 3005 // Update _class_name which could be null previously to be class_name 3006 _class_name = class_name; 3007 3008 // Don't need to check whether this class name is legal or not. 3009 // It has been checked when constant pool is parsed. 3010 // However, make sure it is not an array type. 3011 if (_need_verify) { 3012 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 3013 "Bad class name in class file %s", 3014 CHECK_(nullHandle)); 3015 } 3016 3017 klassOop preserve_this_klass; // for storing result across HandleMark 3018 3019 // release all handles when parsing is done 3020 { HandleMark hm(THREAD); 3021 3022 // Checks if name in class file matches requested name 3023 if (name != NULL && class_name != name) { 3024 ResourceMark rm(THREAD); 3025 Exceptions::fthrow( 3026 THREAD_AND_LOCATION, 3027 vmSymbols::java_lang_NoClassDefFoundError(), 3028 "%s (wrong name: %s)", 3029 name->as_C_string(), 3030 class_name->as_C_string() 3031 ); 3032 return nullHandle; 3033 } 3034 3035 if (TraceClassLoadingPreorder) { 3036 tty->print("[Loading %s", name->as_klass_external_name()); 3037 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 3038 tty->print_cr("]"); 3039 } 3040 3041 u2 super_class_index = cfs->get_u2_fast(); 3042 if (super_class_index == 0) { 3043 check_property(class_name == vmSymbols::java_lang_Object(), 3044 "Invalid superclass index %u in class file %s", 3045 super_class_index, 3046 CHECK_(nullHandle)); 3047 } else { 3048 check_property(valid_cp_range(super_class_index, cp_size) && 3049 is_klass_reference(cp, super_class_index), 3050 "Invalid superclass index %u in class file %s", 3051 super_class_index, 3052 CHECK_(nullHandle)); 3053 // The class name should be legal because it is checked when parsing constant pool. 3054 // However, make sure it is not an array type. 3055 bool is_array = false; 3056 if (cp->tag_at(super_class_index).is_klass()) { 3057 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index)); 3058 if (_need_verify) 3059 is_array = super_klass->oop_is_array(); 3060 } else if (_need_verify) { 3061 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3062 } 3063 if (_need_verify) { 3064 guarantee_property(!is_array, 3065 "Bad superclass name in class file %s", CHECK_(nullHandle)); 3066 } 3067 } 3068 3069 // Interfaces 3070 u2 itfs_len = cfs->get_u2_fast(); 3071 objArrayHandle local_interfaces; 3072 if (itfs_len == 0) { 3073 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 3074 } else { 3075 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle)); 3076 } 3077 3078 // Fields (offsets are filled in later) 3079 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0}; 3080 objArrayHandle fields_annotations; 3081 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle)); 3082 // Methods 3083 bool has_final_method = false; 3084 AccessFlags promoted_flags; 3085 promoted_flags.set_flags(0); 3086 // These need to be oop pointers because they are allocated lazily 3087 // inside parse_methods inside a nested HandleMark 3088 objArrayOop methods_annotations_oop = NULL; 3089 objArrayOop methods_parameter_annotations_oop = NULL; 3090 objArrayOop methods_default_annotations_oop = NULL; 3091 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(), 3092 &promoted_flags, 3093 &has_final_method, 3094 &methods_annotations_oop, 3095 &methods_parameter_annotations_oop, 3096 &methods_default_annotations_oop, 3097 CHECK_(nullHandle)); 3098 3099 objArrayHandle methods_annotations(THREAD, methods_annotations_oop); 3100 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop); 3101 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop); 3102 3103 // We check super class after class file is parsed and format is checked 3104 if (super_class_index > 0 && super_klass.is_null()) { 3105 Symbol* sk = cp->klass_name_at(super_class_index); 3106 if (access_flags.is_interface()) { 3107 // Before attempting to resolve the superclass, check for class format 3108 // errors not checked yet. 3109 guarantee_property(sk == vmSymbols::java_lang_Object(), 3110 "Interfaces must have java.lang.Object as superclass in class file %s", 3111 CHECK_(nullHandle)); 3112 } 3113 klassOop k = SystemDictionary::resolve_super_or_fail(class_name, 3114 sk, 3115 class_loader, 3116 protection_domain, 3117 true, 3118 CHECK_(nullHandle)); 3119 3120 KlassHandle kh (THREAD, k); 3121 super_klass = instanceKlassHandle(THREAD, kh()); 3122 if (LinkWellKnownClasses) // my super class is well known to me 3123 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve 3124 } 3125 if (super_klass.not_null()) { 3126 if (super_klass->is_interface()) { 3127 ResourceMark rm(THREAD); 3128 Exceptions::fthrow( 3129 THREAD_AND_LOCATION, 3130 vmSymbols::java_lang_IncompatibleClassChangeError(), 3131 "class %s has interface %s as super class", 3132 class_name->as_klass_external_name(), 3133 super_klass->external_name() 3134 ); 3135 return nullHandle; 3136 } 3137 // Make sure super class is not final 3138 if (super_klass->is_final()) { 3139 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 3140 } 3141 } 3142 3143 // Compute the transitive list of all unique interfaces implemented by this class 3144 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 3145 3146 // sort methods 3147 typeArrayHandle method_ordering = sort_methods(methods, 3148 methods_annotations, 3149 methods_parameter_annotations, 3150 methods_default_annotations, 3151 CHECK_(nullHandle)); 3152 3153 // promote flags from parse_methods() to the klass' flags 3154 access_flags.add_promoted_flags(promoted_flags.as_int()); 3155 3156 // Size of Java vtable (in words) 3157 int vtable_size = 0; 3158 int itable_size = 0; 3159 int num_miranda_methods = 0; 3160 3161 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size, 3162 num_miranda_methods, 3163 super_klass(), 3164 methods(), 3165 access_flags, 3166 class_loader, 3167 class_name, 3168 local_interfaces(), 3169 CHECK_(nullHandle)); 3170 3171 // Size of Java itable (in words) 3172 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces); 3173 3174 // Field size and offset computation 3175 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size(); 3176 #ifndef PRODUCT 3177 int orig_nonstatic_field_size = 0; 3178 #endif 3179 int static_field_size = 0; 3180 int next_static_oop_offset; 3181 int next_static_double_offset; 3182 int next_static_word_offset; 3183 int next_static_short_offset; 3184 int next_static_byte_offset; 3185 int next_static_type_offset; 3186 int next_nonstatic_oop_offset; 3187 int next_nonstatic_double_offset; 3188 int next_nonstatic_word_offset; 3189 int next_nonstatic_short_offset; 3190 int next_nonstatic_byte_offset; 3191 int next_nonstatic_type_offset; 3192 int first_nonstatic_oop_offset; 3193 int first_nonstatic_field_offset; 3194 int next_nonstatic_field_offset; 3195 3196 // Calculate the starting byte offsets 3197 next_static_oop_offset = (instanceKlass::header_size() + 3198 align_object_offset(vtable_size) + 3199 align_object_offset(itable_size)) * wordSize; 3200 next_static_double_offset = next_static_oop_offset + 3201 (fac.static_oop_count * heapOopSize); 3202 if ( fac.static_double_count && 3203 (Universe::field_type_should_be_aligned(T_DOUBLE) || 3204 Universe::field_type_should_be_aligned(T_LONG)) ) { 3205 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 3206 } 3207 3208 next_static_word_offset = next_static_double_offset + 3209 (fac.static_double_count * BytesPerLong); 3210 next_static_short_offset = next_static_word_offset + 3211 (fac.static_word_count * BytesPerInt); 3212 next_static_byte_offset = next_static_short_offset + 3213 (fac.static_short_count * BytesPerShort); 3214 next_static_type_offset = align_size_up((next_static_byte_offset + 3215 fac.static_byte_count ), wordSize ); 3216 static_field_size = (next_static_type_offset - 3217 next_static_oop_offset) / wordSize; 3218 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() + 3219 nonstatic_field_size * heapOopSize; 3220 next_nonstatic_field_offset = first_nonstatic_field_offset; 3221 3222 // Add fake fields for java.lang.Class instances (also see below) 3223 if (class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) { 3224 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle)); 3225 } 3226 3227 // adjust the vmentry field declaration in java.dyn.MethodHandle 3228 if (EnableMethodHandles && class_name == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) { 3229 java_dyn_MethodHandle_fix_pre(cp, fields, &fac, CHECK_(nullHandle)); 3230 } 3231 3232 // Add a fake "discovered" field if it is not present 3233 // for compatibility with earlier jdk's. 3234 if (class_name == vmSymbols::java_lang_ref_Reference() 3235 && class_loader.is_null()) { 3236 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle)); 3237 } 3238 // end of "discovered" field compactibility fix 3239 3240 unsigned int nonstatic_double_count = fac.nonstatic_double_count; 3241 unsigned int nonstatic_word_count = fac.nonstatic_word_count; 3242 unsigned int nonstatic_short_count = fac.nonstatic_short_count; 3243 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count; 3244 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count; 3245 3246 bool super_has_nonstatic_fields = 3247 (super_klass() != NULL && super_klass->has_nonstatic_fields()); 3248 bool has_nonstatic_fields = super_has_nonstatic_fields || 3249 ((nonstatic_double_count + nonstatic_word_count + 3250 nonstatic_short_count + nonstatic_byte_count + 3251 nonstatic_oop_count) != 0); 3252 3253 3254 // Prepare list of oops for oop map generation. 3255 int* nonstatic_oop_offsets; 3256 unsigned int* nonstatic_oop_counts; 3257 unsigned int nonstatic_oop_map_count = 0; 3258 3259 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3260 THREAD, int, nonstatic_oop_count + 1); 3261 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3262 THREAD, unsigned int, nonstatic_oop_count + 1); 3263 3264 // Add fake fields for java.lang.Class instances (also see above). 3265 // FieldsAllocationStyle and CompactFields values will be reset to default. 3266 if(class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) { 3267 java_lang_Class_fix_post(&next_nonstatic_field_offset); 3268 nonstatic_oop_offsets[0] = first_nonstatic_field_offset; 3269 const uint fake_oop_count = (next_nonstatic_field_offset - 3270 first_nonstatic_field_offset) / heapOopSize; 3271 nonstatic_oop_counts[0] = fake_oop_count; 3272 nonstatic_oop_map_count = 1; 3273 nonstatic_oop_count -= fake_oop_count; 3274 first_nonstatic_oop_offset = first_nonstatic_field_offset; 3275 } else { 3276 first_nonstatic_oop_offset = 0; // will be set for first oop field 3277 } 3278 3279 #ifndef PRODUCT 3280 if( PrintCompactFieldsSavings ) { 3281 next_nonstatic_double_offset = next_nonstatic_field_offset + 3282 (nonstatic_oop_count * heapOopSize); 3283 if ( nonstatic_double_count > 0 ) { 3284 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong); 3285 } 3286 next_nonstatic_word_offset = next_nonstatic_double_offset + 3287 (nonstatic_double_count * BytesPerLong); 3288 next_nonstatic_short_offset = next_nonstatic_word_offset + 3289 (nonstatic_word_count * BytesPerInt); 3290 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3291 (nonstatic_short_count * BytesPerShort); 3292 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset + 3293 nonstatic_byte_count ), heapOopSize ); 3294 orig_nonstatic_field_size = nonstatic_field_size + 3295 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize); 3296 } 3297 #endif 3298 bool compact_fields = CompactFields; 3299 int allocation_style = FieldsAllocationStyle; 3300 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3301 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3302 allocation_style = 1; // Optimistic 3303 } 3304 3305 // The next classes have predefined hard-coded fields offsets 3306 // (see in JavaClasses::compute_hard_coded_offsets()). 3307 // Use default fields allocation order for them. 3308 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 3309 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3310 class_name == vmSymbols::java_lang_Class() || 3311 class_name == vmSymbols::java_lang_ClassLoader() || 3312 class_name == vmSymbols::java_lang_ref_Reference() || 3313 class_name == vmSymbols::java_lang_ref_SoftReference() || 3314 class_name == vmSymbols::java_lang_StackTraceElement() || 3315 class_name == vmSymbols::java_lang_String() || 3316 class_name == vmSymbols::java_lang_Throwable() || 3317 class_name == vmSymbols::java_lang_Boolean() || 3318 class_name == vmSymbols::java_lang_Character() || 3319 class_name == vmSymbols::java_lang_Float() || 3320 class_name == vmSymbols::java_lang_Double() || 3321 class_name == vmSymbols::java_lang_Byte() || 3322 class_name == vmSymbols::java_lang_Short() || 3323 class_name == vmSymbols::java_lang_Integer() || 3324 class_name == vmSymbols::java_lang_Long())) { 3325 allocation_style = 0; // Allocate oops first 3326 compact_fields = false; // Don't compact fields 3327 } 3328 3329 if( allocation_style == 0 ) { 3330 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes 3331 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3332 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3333 (nonstatic_oop_count * heapOopSize); 3334 } else if( allocation_style == 1 ) { 3335 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops 3336 next_nonstatic_double_offset = next_nonstatic_field_offset; 3337 } else if( allocation_style == 2 ) { 3338 // Fields allocation: oops fields in super and sub classes are together. 3339 if( nonstatic_field_size > 0 && super_klass() != NULL && 3340 super_klass->nonstatic_oop_map_size() > 0 ) { 3341 int map_size = super_klass->nonstatic_oop_map_size(); 3342 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps(); 3343 OopMapBlock* last_map = first_map + map_size - 1; 3344 int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3345 if (next_offset == next_nonstatic_field_offset) { 3346 allocation_style = 0; // allocate oops first 3347 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3348 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3349 (nonstatic_oop_count * heapOopSize); 3350 } 3351 } 3352 if( allocation_style == 2 ) { 3353 allocation_style = 1; // allocate oops last 3354 next_nonstatic_double_offset = next_nonstatic_field_offset; 3355 } 3356 } else { 3357 ShouldNotReachHere(); 3358 } 3359 3360 int nonstatic_oop_space_count = 0; 3361 int nonstatic_word_space_count = 0; 3362 int nonstatic_short_space_count = 0; 3363 int nonstatic_byte_space_count = 0; 3364 int nonstatic_oop_space_offset; 3365 int nonstatic_word_space_offset; 3366 int nonstatic_short_space_offset; 3367 int nonstatic_byte_space_offset; 3368 3369 if( nonstatic_double_count > 0 ) { 3370 int offset = next_nonstatic_double_offset; 3371 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3372 if( compact_fields && offset != next_nonstatic_double_offset ) { 3373 // Allocate available fields into the gap before double field. 3374 int length = next_nonstatic_double_offset - offset; 3375 assert(length == BytesPerInt, ""); 3376 nonstatic_word_space_offset = offset; 3377 if( nonstatic_word_count > 0 ) { 3378 nonstatic_word_count -= 1; 3379 nonstatic_word_space_count = 1; // Only one will fit 3380 length -= BytesPerInt; 3381 offset += BytesPerInt; 3382 } 3383 nonstatic_short_space_offset = offset; 3384 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 3385 nonstatic_short_count -= 1; 3386 nonstatic_short_space_count += 1; 3387 length -= BytesPerShort; 3388 offset += BytesPerShort; 3389 } 3390 nonstatic_byte_space_offset = offset; 3391 while( length > 0 && nonstatic_byte_count > 0 ) { 3392 nonstatic_byte_count -= 1; 3393 nonstatic_byte_space_count += 1; 3394 length -= 1; 3395 } 3396 // Allocate oop field in the gap if there are no other fields for that. 3397 nonstatic_oop_space_offset = offset; 3398 if( length >= heapOopSize && nonstatic_oop_count > 0 && 3399 allocation_style != 0 ) { // when oop fields not first 3400 nonstatic_oop_count -= 1; 3401 nonstatic_oop_space_count = 1; // Only one will fit 3402 length -= heapOopSize; 3403 offset += heapOopSize; 3404 } 3405 } 3406 } 3407 3408 next_nonstatic_word_offset = next_nonstatic_double_offset + 3409 (nonstatic_double_count * BytesPerLong); 3410 next_nonstatic_short_offset = next_nonstatic_word_offset + 3411 (nonstatic_word_count * BytesPerInt); 3412 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3413 (nonstatic_short_count * BytesPerShort); 3414 3415 int notaligned_offset; 3416 if( allocation_style == 0 ) { 3417 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count; 3418 } else { // allocation_style == 1 3419 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count; 3420 if( nonstatic_oop_count > 0 ) { 3421 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3422 } 3423 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3424 } 3425 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize ); 3426 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset 3427 - first_nonstatic_field_offset)/heapOopSize); 3428 3429 // Iterate over fields again and compute correct offsets. 3430 // The field allocation type was temporarily stored in the offset slot. 3431 // oop fields are located before non-oop fields (static and non-static). 3432 int len = fields->length(); 3433 for (int i = 0; i < len; i += instanceKlass::next_offset) { 3434 int real_offset; 3435 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset); 3436 switch (atype) { 3437 case STATIC_OOP: 3438 real_offset = next_static_oop_offset; 3439 next_static_oop_offset += heapOopSize; 3440 break; 3441 case STATIC_BYTE: 3442 real_offset = next_static_byte_offset; 3443 next_static_byte_offset += 1; 3444 break; 3445 case STATIC_SHORT: 3446 real_offset = next_static_short_offset; 3447 next_static_short_offset += BytesPerShort; 3448 break; 3449 case STATIC_WORD: 3450 real_offset = next_static_word_offset; 3451 next_static_word_offset += BytesPerInt; 3452 break; 3453 case STATIC_ALIGNED_DOUBLE: 3454 case STATIC_DOUBLE: 3455 real_offset = next_static_double_offset; 3456 next_static_double_offset += BytesPerLong; 3457 break; 3458 case NONSTATIC_OOP: 3459 if( nonstatic_oop_space_count > 0 ) { 3460 real_offset = nonstatic_oop_space_offset; 3461 nonstatic_oop_space_offset += heapOopSize; 3462 nonstatic_oop_space_count -= 1; 3463 } else { 3464 real_offset = next_nonstatic_oop_offset; 3465 next_nonstatic_oop_offset += heapOopSize; 3466 } 3467 // Update oop maps 3468 if( nonstatic_oop_map_count > 0 && 3469 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3470 real_offset - 3471 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3472 heapOopSize ) { 3473 // Extend current oop map 3474 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3475 } else { 3476 // Create new oop map 3477 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3478 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3479 nonstatic_oop_map_count += 1; 3480 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3481 first_nonstatic_oop_offset = real_offset; 3482 } 3483 } 3484 break; 3485 case NONSTATIC_BYTE: 3486 if( nonstatic_byte_space_count > 0 ) { 3487 real_offset = nonstatic_byte_space_offset; 3488 nonstatic_byte_space_offset += 1; 3489 nonstatic_byte_space_count -= 1; 3490 } else { 3491 real_offset = next_nonstatic_byte_offset; 3492 next_nonstatic_byte_offset += 1; 3493 } 3494 break; 3495 case NONSTATIC_SHORT: 3496 if( nonstatic_short_space_count > 0 ) { 3497 real_offset = nonstatic_short_space_offset; 3498 nonstatic_short_space_offset += BytesPerShort; 3499 nonstatic_short_space_count -= 1; 3500 } else { 3501 real_offset = next_nonstatic_short_offset; 3502 next_nonstatic_short_offset += BytesPerShort; 3503 } 3504 break; 3505 case NONSTATIC_WORD: 3506 if( nonstatic_word_space_count > 0 ) { 3507 real_offset = nonstatic_word_space_offset; 3508 nonstatic_word_space_offset += BytesPerInt; 3509 nonstatic_word_space_count -= 1; 3510 } else { 3511 real_offset = next_nonstatic_word_offset; 3512 next_nonstatic_word_offset += BytesPerInt; 3513 } 3514 break; 3515 case NONSTATIC_ALIGNED_DOUBLE: 3516 case NONSTATIC_DOUBLE: 3517 real_offset = next_nonstatic_double_offset; 3518 next_nonstatic_double_offset += BytesPerLong; 3519 break; 3520 default: 3521 ShouldNotReachHere(); 3522 } 3523 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset)); 3524 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset)); 3525 } 3526 3527 // Size of instances 3528 int instance_size; 3529 3530 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize ); 3531 instance_size = align_object_size(next_nonstatic_type_offset / wordSize); 3532 3533 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value"); 3534 3535 // Number of non-static oop map blocks allocated at end of klass. 3536 const unsigned int total_oop_map_count = 3537 compute_oop_map_count(super_klass, nonstatic_oop_map_count, 3538 first_nonstatic_oop_offset); 3539 3540 // Compute reference type 3541 ReferenceType rt; 3542 if (super_klass() == NULL) { 3543 rt = REF_NONE; 3544 } else { 3545 rt = super_klass->reference_type(); 3546 } 3547 3548 // We can now create the basic klassOop for this klass 3549 klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size, 3550 static_field_size, 3551 total_oop_map_count, 3552 rt, CHECK_(nullHandle)); 3553 instanceKlassHandle this_klass (THREAD, ik); 3554 3555 assert(this_klass->static_field_size() == static_field_size, "sanity"); 3556 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count, 3557 "sanity"); 3558 3559 // Fill in information already parsed 3560 this_klass->set_access_flags(access_flags); 3561 this_klass->set_should_verify_class(verify); 3562 jint lh = Klass::instance_layout_helper(instance_size, false); 3563 this_klass->set_layout_helper(lh); 3564 assert(this_klass->oop_is_instance(), "layout is correct"); 3565 assert(this_klass->size_helper() == instance_size, "correct size_helper"); 3566 // Not yet: supers are done below to support the new subtype-checking fields 3567 //this_klass->set_super(super_klass()); 3568 this_klass->set_class_loader(class_loader()); 3569 this_klass->set_nonstatic_field_size(nonstatic_field_size); 3570 this_klass->set_has_nonstatic_fields(has_nonstatic_fields); 3571 this_klass->set_static_oop_field_size(fac.static_oop_count); 3572 cp->set_pool_holder(this_klass()); 3573 error_handler.set_in_error(false); // turn off error handler for cp 3574 this_klass->set_constants(cp()); 3575 this_klass->set_local_interfaces(local_interfaces()); 3576 this_klass->set_fields(fields()); 3577 this_klass->set_methods(methods()); 3578 if (has_final_method) { 3579 this_klass->set_has_final_method(); 3580 } 3581 this_klass->set_method_ordering(method_ordering()); 3582 // The instanceKlass::_methods_jmethod_ids cache and the 3583 // instanceKlass::_methods_cached_itable_indices cache are 3584 // both managed on the assumption that the initial cache 3585 // size is equal to the number of methods in the class. If 3586 // that changes, then instanceKlass::idnum_can_increment() 3587 // has to be changed accordingly. 3588 this_klass->set_initial_method_idnum(methods->length()); 3589 this_klass->set_name(cp->klass_name_at(this_class_index)); 3590 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself 3591 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve 3592 this_klass->set_protection_domain(protection_domain()); 3593 this_klass->set_fields_annotations(fields_annotations()); 3594 this_klass->set_methods_annotations(methods_annotations()); 3595 this_klass->set_methods_parameter_annotations(methods_parameter_annotations()); 3596 this_klass->set_methods_default_annotations(methods_default_annotations()); 3597 3598 this_klass->set_minor_version(minor_version); 3599 this_klass->set_major_version(major_version); 3600 3601 // Set up methodOop::intrinsic_id as soon as we know the names of methods. 3602 // (We used to do this lazily, but now we query it in Rewriter, 3603 // which is eagerly done for every method, so we might as well do it now, 3604 // when everything is fresh in memory.) 3605 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) { 3606 for (int j = 0; j < methods->length(); j++) { 3607 ((methodOop)methods->obj_at(j))->init_intrinsic_id(); 3608 } 3609 } 3610 3611 if (cached_class_file_bytes != NULL) { 3612 // JVMTI: we have an instanceKlass now, tell it about the cached bytes 3613 this_klass->set_cached_class_file(cached_class_file_bytes, 3614 cached_class_file_length); 3615 } 3616 3617 // Miranda methods 3618 if ((num_miranda_methods > 0) || 3619 // if this class introduced new miranda methods or 3620 (super_klass.not_null() && (super_klass->has_miranda_methods())) 3621 // super class exists and this class inherited miranda methods 3622 ) { 3623 this_klass->set_has_miranda_methods(); // then set a flag 3624 } 3625 3626 // Additional attributes 3627 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle)); 3628 3629 // Make sure this is the end of class file stream 3630 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 3631 3632 // Initialize static fields 3633 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle)); 3634 3635 // VerifyOops believes that once this has been set, the object is completely loaded. 3636 // Compute transitive closure of interfaces this class implements 3637 this_klass->set_transitive_interfaces(transitive_interfaces()); 3638 3639 // Fill in information needed to compute superclasses. 3640 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 3641 3642 // Initialize itable offset tables 3643 klassItable::setup_itable_offset_table(this_klass); 3644 3645 // Do final class setup 3646 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts); 3647 3648 set_precomputed_flags(this_klass); 3649 3650 // reinitialize modifiers, using the InnerClasses attribute 3651 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 3652 this_klass->set_modifier_flags(computed_modifiers); 3653 3654 // check if this class can access its super class 3655 check_super_class_access(this_klass, CHECK_(nullHandle)); 3656 3657 // check if this class can access its superinterfaces 3658 check_super_interface_access(this_klass, CHECK_(nullHandle)); 3659 3660 // check if this class overrides any final method 3661 check_final_method_override(this_klass, CHECK_(nullHandle)); 3662 3663 // check that if this class is an interface then it doesn't have static methods 3664 if (this_klass->is_interface()) { 3665 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 3666 } 3667 3668 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()), 3669 false /* not shared class */); 3670 3671 if (TraceClassLoading) { 3672 // print in a single call to reduce interleaving of output 3673 if (cfs->source() != NULL) { 3674 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 3675 cfs->source()); 3676 } else if (class_loader.is_null()) { 3677 if (THREAD->is_Java_thread()) { 3678 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1); 3679 tty->print("[Loaded %s by instance of %s]\n", 3680 this_klass->external_name(), 3681 instanceKlass::cast(caller)->external_name()); 3682 } else { 3683 tty->print("[Loaded %s]\n", this_klass->external_name()); 3684 } 3685 } else { 3686 ResourceMark rm; 3687 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 3688 instanceKlass::cast(class_loader->klass())->external_name()); 3689 } 3690 } 3691 3692 if (TraceClassResolution) { 3693 // print out the superclass. 3694 const char * from = Klass::cast(this_klass())->external_name(); 3695 if (this_klass->java_super() != NULL) { 3696 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name()); 3697 } 3698 // print out each of the interface classes referred to by this class. 3699 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces()); 3700 if (!local_interfaces.is_null()) { 3701 int length = local_interfaces->length(); 3702 for (int i = 0; i < length; i++) { 3703 klassOop k = klassOop(local_interfaces->obj_at(i)); 3704 instanceKlass* to_class = instanceKlass::cast(k); 3705 const char * to = to_class->external_name(); 3706 tty->print("RESOLVE %s %s (interface)\n", from, to); 3707 } 3708 } 3709 } 3710 3711 #ifndef PRODUCT 3712 if( PrintCompactFieldsSavings ) { 3713 if( nonstatic_field_size < orig_nonstatic_field_size ) { 3714 tty->print("[Saved %d of %d bytes in %s]\n", 3715 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize, 3716 orig_nonstatic_field_size*heapOopSize, 3717 this_klass->external_name()); 3718 } else if( nonstatic_field_size > orig_nonstatic_field_size ) { 3719 tty->print("[Wasted %d over %d bytes in %s]\n", 3720 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize, 3721 orig_nonstatic_field_size*heapOopSize, 3722 this_klass->external_name()); 3723 } 3724 } 3725 #endif 3726 3727 // preserve result across HandleMark 3728 preserve_this_klass = this_klass(); 3729 } 3730 3731 // Create new handle outside HandleMark 3732 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 3733 debug_only(this_klass->as_klassOop()->verify();) 3734 3735 return this_klass; 3736 } 3737 3738 3739 unsigned int 3740 ClassFileParser::compute_oop_map_count(instanceKlassHandle super, 3741 unsigned int nonstatic_oop_map_count, 3742 int first_nonstatic_oop_offset) { 3743 unsigned int map_count = 3744 super.is_null() ? 0 : super->nonstatic_oop_map_count(); 3745 if (nonstatic_oop_map_count > 0) { 3746 // We have oops to add to map 3747 if (map_count == 0) { 3748 map_count = nonstatic_oop_map_count; 3749 } else { 3750 // Check whether we should add a new map block or whether the last one can 3751 // be extended 3752 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 3753 OopMapBlock* const last_map = first_map + map_count - 1; 3754 3755 int next_offset = last_map->offset() + last_map->count() * heapOopSize; 3756 if (next_offset == first_nonstatic_oop_offset) { 3757 // There is no gap bettwen superklass's last oop field and first 3758 // local oop field, merge maps. 3759 nonstatic_oop_map_count -= 1; 3760 } else { 3761 // Superklass didn't end with a oop field, add extra maps 3762 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 3763 } 3764 map_count += nonstatic_oop_map_count; 3765 } 3766 } 3767 return map_count; 3768 } 3769 3770 3771 void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 3772 unsigned int nonstatic_oop_map_count, 3773 int* nonstatic_oop_offsets, 3774 unsigned int* nonstatic_oop_counts) { 3775 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 3776 const instanceKlass* const super = k->superklass(); 3777 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 3778 if (super_count > 0) { 3779 // Copy maps from superklass 3780 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 3781 for (unsigned int i = 0; i < super_count; ++i) { 3782 *this_oop_map++ = *super_oop_map++; 3783 } 3784 } 3785 3786 if (nonstatic_oop_map_count > 0) { 3787 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 3788 // The counts differ because there is no gap between superklass's last oop 3789 // field and the first local oop field. Extend the last oop map copied 3790 // from the superklass instead of creating new one. 3791 nonstatic_oop_map_count--; 3792 nonstatic_oop_offsets++; 3793 this_oop_map--; 3794 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 3795 this_oop_map++; 3796 } 3797 3798 // Add new map blocks, fill them 3799 while (nonstatic_oop_map_count-- > 0) { 3800 this_oop_map->set_offset(*nonstatic_oop_offsets++); 3801 this_oop_map->set_count(*nonstatic_oop_counts++); 3802 this_oop_map++; 3803 } 3804 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 3805 this_oop_map, "sanity"); 3806 } 3807 } 3808 3809 3810 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 3811 klassOop super = k->super(); 3812 3813 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 3814 // in which case we don't have to register objects as finalizable 3815 if (!_has_empty_finalizer) { 3816 if (_has_finalizer || 3817 (super != NULL && super->klass_part()->has_finalizer())) { 3818 k->set_has_finalizer(); 3819 } 3820 } 3821 3822 #ifdef ASSERT 3823 bool f = false; 3824 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(), 3825 vmSymbols::void_method_signature()); 3826 if (m != NULL && !m->is_empty_method()) { 3827 f = true; 3828 } 3829 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 3830 #endif 3831 3832 // Check if this klass supports the java.lang.Cloneable interface 3833 if (SystemDictionary::Cloneable_klass_loaded()) { 3834 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) { 3835 k->set_is_cloneable(); 3836 } 3837 } 3838 3839 // Check if this klass has a vanilla default constructor 3840 if (super == NULL) { 3841 // java.lang.Object has empty default constructor 3842 k->set_has_vanilla_constructor(); 3843 } else { 3844 if (Klass::cast(super)->has_vanilla_constructor() && 3845 _has_vanilla_constructor) { 3846 k->set_has_vanilla_constructor(); 3847 } 3848 #ifdef ASSERT 3849 bool v = false; 3850 if (Klass::cast(super)->has_vanilla_constructor()) { 3851 methodOop constructor = k->find_method(vmSymbols::object_initializer_name( 3852 ), vmSymbols::void_method_signature()); 3853 if (constructor != NULL && constructor->is_vanilla_constructor()) { 3854 v = true; 3855 } 3856 } 3857 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 3858 #endif 3859 } 3860 3861 // If it cannot be fast-path allocated, set a bit in the layout helper. 3862 // See documentation of instanceKlass::can_be_fastpath_allocated(). 3863 assert(k->size_helper() > 0, "layout_helper is initialized"); 3864 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 3865 || k->is_abstract() || k->is_interface() 3866 || (k->name() == vmSymbols::java_lang_Class() 3867 && k->class_loader() == NULL) 3868 || k->size_helper() >= FastAllocateSizeLimit) { 3869 // Forbid fast-path allocation. 3870 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 3871 k->set_layout_helper(lh); 3872 } 3873 } 3874 3875 3876 // utility method for appending and array with check for duplicates 3877 3878 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) { 3879 // iterate over new interfaces 3880 for (int i = 0; i < ifs->length(); i++) { 3881 oop e = ifs->obj_at(i); 3882 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking"); 3883 // check for duplicates 3884 bool duplicate = false; 3885 for (int j = 0; j < index; j++) { 3886 if (result->obj_at(j) == e) { 3887 duplicate = true; 3888 break; 3889 } 3890 } 3891 // add new interface 3892 if (!duplicate) { 3893 result->obj_at_put(index++, e); 3894 } 3895 } 3896 } 3897 3898 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) { 3899 // Compute maximum size for transitive interfaces 3900 int max_transitive_size = 0; 3901 int super_size = 0; 3902 // Add superclass transitive interfaces size 3903 if (super.not_null()) { 3904 super_size = super->transitive_interfaces()->length(); 3905 max_transitive_size += super_size; 3906 } 3907 // Add local interfaces' super interfaces 3908 int local_size = local_ifs->length(); 3909 for (int i = 0; i < local_size; i++) { 3910 klassOop l = klassOop(local_ifs->obj_at(i)); 3911 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length(); 3912 } 3913 // Finally add local interfaces 3914 max_transitive_size += local_size; 3915 // Construct array 3916 objArrayHandle result; 3917 if (max_transitive_size == 0) { 3918 // no interfaces, use canonicalized array 3919 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 3920 } else if (max_transitive_size == super_size) { 3921 // no new local interfaces added, share superklass' transitive interface array 3922 result = objArrayHandle(THREAD, super->transitive_interfaces()); 3923 } else if (max_transitive_size == local_size) { 3924 // only local interfaces added, share local interface array 3925 result = local_ifs; 3926 } else { 3927 objArrayHandle nullHandle; 3928 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle)); 3929 result = objArrayHandle(THREAD, new_objarray); 3930 int index = 0; 3931 // Copy down from superclass 3932 if (super.not_null()) { 3933 append_interfaces(result, index, super->transitive_interfaces()); 3934 } 3935 // Copy down from local interfaces' superinterfaces 3936 for (int i = 0; i < local_ifs->length(); i++) { 3937 klassOop l = klassOop(local_ifs->obj_at(i)); 3938 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces()); 3939 } 3940 // Finally add local interfaces 3941 append_interfaces(result, index, local_ifs()); 3942 3943 // Check if duplicates were removed 3944 if (index != max_transitive_size) { 3945 assert(index < max_transitive_size, "just checking"); 3946 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle)); 3947 for (int i = 0; i < index; i++) { 3948 oop e = result->obj_at(i); 3949 assert(e != NULL, "just checking"); 3950 new_result->obj_at_put(i, e); 3951 } 3952 result = objArrayHandle(THREAD, new_result); 3953 } 3954 } 3955 return result; 3956 } 3957 3958 3959 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 3960 klassOop super = this_klass->super(); 3961 if ((super != NULL) && 3962 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) { 3963 ResourceMark rm(THREAD); 3964 Exceptions::fthrow( 3965 THREAD_AND_LOCATION, 3966 vmSymbols::java_lang_IllegalAccessError(), 3967 "class %s cannot access its superclass %s", 3968 this_klass->external_name(), 3969 instanceKlass::cast(super)->external_name() 3970 ); 3971 return; 3972 } 3973 } 3974 3975 3976 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 3977 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces()); 3978 int lng = local_interfaces->length(); 3979 for (int i = lng - 1; i >= 0; i--) { 3980 klassOop k = klassOop(local_interfaces->obj_at(i)); 3981 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface"); 3982 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) { 3983 ResourceMark rm(THREAD); 3984 Exceptions::fthrow( 3985 THREAD_AND_LOCATION, 3986 vmSymbols::java_lang_IllegalAccessError(), 3987 "class %s cannot access its superinterface %s", 3988 this_klass->external_name(), 3989 instanceKlass::cast(k)->external_name() 3990 ); 3991 return; 3992 } 3993 } 3994 } 3995 3996 3997 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 3998 objArrayHandle methods (THREAD, this_klass->methods()); 3999 int num_methods = methods->length(); 4000 4001 // go thru each method and check if it overrides a final method 4002 for (int index = 0; index < num_methods; index++) { 4003 methodOop m = (methodOop)methods->obj_at(index); 4004 4005 // skip private, static and <init> methods 4006 if ((!m->is_private()) && 4007 (!m->is_static()) && 4008 (m->name() != vmSymbols::object_initializer_name())) { 4009 4010 Symbol* name = m->name(); 4011 Symbol* signature = m->signature(); 4012 klassOop k = this_klass->super(); 4013 methodOop super_m = NULL; 4014 while (k != NULL) { 4015 // skip supers that don't have final methods. 4016 if (k->klass_part()->has_final_method()) { 4017 // lookup a matching method in the super class hierarchy 4018 super_m = instanceKlass::cast(k)->lookup_method(name, signature); 4019 if (super_m == NULL) { 4020 break; // didn't find any match; get out 4021 } 4022 4023 if (super_m->is_final() && 4024 // matching method in super is final 4025 (Reflection::verify_field_access(this_klass->as_klassOop(), 4026 super_m->method_holder(), 4027 super_m->method_holder(), 4028 super_m->access_flags(), false)) 4029 // this class can access super final method and therefore override 4030 ) { 4031 ResourceMark rm(THREAD); 4032 Exceptions::fthrow( 4033 THREAD_AND_LOCATION, 4034 vmSymbols::java_lang_VerifyError(), 4035 "class %s overrides final method %s.%s", 4036 this_klass->external_name(), 4037 name->as_C_string(), 4038 signature->as_C_string() 4039 ); 4040 return; 4041 } 4042 4043 // continue to look from super_m's holder's super. 4044 k = instanceKlass::cast(super_m->method_holder())->super(); 4045 continue; 4046 } 4047 4048 k = k->klass_part()->super(); 4049 } 4050 } 4051 } 4052 } 4053 4054 4055 // assumes that this_klass is an interface 4056 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 4057 assert(this_klass->is_interface(), "not an interface"); 4058 objArrayHandle methods (THREAD, this_klass->methods()); 4059 int num_methods = methods->length(); 4060 4061 for (int index = 0; index < num_methods; index++) { 4062 methodOop m = (methodOop)methods->obj_at(index); 4063 // if m is static and not the init method, throw a verify error 4064 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4065 ResourceMark rm(THREAD); 4066 Exceptions::fthrow( 4067 THREAD_AND_LOCATION, 4068 vmSymbols::java_lang_VerifyError(), 4069 "Illegal static method %s in interface %s", 4070 m->name()->as_C_string(), 4071 this_klass->external_name() 4072 ); 4073 return; 4074 } 4075 } 4076 } 4077 4078 // utility methods for format checking 4079 4080 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 4081 if (!_need_verify) { return; } 4082 4083 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4084 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4085 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4086 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4087 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4088 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4089 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4090 4091 if ((is_abstract && is_final) || 4092 (is_interface && !is_abstract) || 4093 (is_interface && major_gte_15 && (is_super || is_enum)) || 4094 (!is_interface && major_gte_15 && is_annotation)) { 4095 ResourceMark rm(THREAD); 4096 Exceptions::fthrow( 4097 THREAD_AND_LOCATION, 4098 vmSymbols::java_lang_ClassFormatError(), 4099 "Illegal class modifiers in class %s: 0x%X", 4100 _class_name->as_C_string(), flags 4101 ); 4102 return; 4103 } 4104 } 4105 4106 bool ClassFileParser::has_illegal_visibility(jint flags) { 4107 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4108 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4109 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4110 4111 return ((is_public && is_protected) || 4112 (is_public && is_private) || 4113 (is_protected && is_private)); 4114 } 4115 4116 bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 4117 u2 max_version = 4118 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION : 4119 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION); 4120 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 4121 (major <= max_version) && 4122 ((major != max_version) || 4123 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 4124 } 4125 4126 void ClassFileParser::verify_legal_field_modifiers( 4127 jint flags, bool is_interface, TRAPS) { 4128 if (!_need_verify) { return; } 4129 4130 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4131 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4132 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4133 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4134 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4135 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4136 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4137 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4138 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4139 4140 bool is_illegal = false; 4141 4142 if (is_interface) { 4143 if (!is_public || !is_static || !is_final || is_private || 4144 is_protected || is_volatile || is_transient || 4145 (major_gte_15 && is_enum)) { 4146 is_illegal = true; 4147 } 4148 } else { // not interface 4149 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4150 is_illegal = true; 4151 } 4152 } 4153 4154 if (is_illegal) { 4155 ResourceMark rm(THREAD); 4156 Exceptions::fthrow( 4157 THREAD_AND_LOCATION, 4158 vmSymbols::java_lang_ClassFormatError(), 4159 "Illegal field modifiers in class %s: 0x%X", 4160 _class_name->as_C_string(), flags); 4161 return; 4162 } 4163 } 4164 4165 void ClassFileParser::verify_legal_method_modifiers( 4166 jint flags, bool is_interface, Symbol* name, TRAPS) { 4167 if (!_need_verify) { return; } 4168 4169 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4170 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4171 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4172 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4173 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4174 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4175 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4176 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4177 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4178 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4179 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4180 4181 bool is_illegal = false; 4182 4183 if (is_interface) { 4184 if (!is_abstract || !is_public || is_static || is_final || 4185 is_native || (major_gte_15 && (is_synchronized || is_strict))) { 4186 is_illegal = true; 4187 } 4188 } else { // not interface 4189 if (is_initializer) { 4190 if (is_static || is_final || is_synchronized || is_native || 4191 is_abstract || (major_gte_15 && is_bridge)) { 4192 is_illegal = true; 4193 } 4194 } else { // not initializer 4195 if (is_abstract) { 4196 if ((is_final || is_native || is_private || is_static || 4197 (major_gte_15 && (is_synchronized || is_strict)))) { 4198 is_illegal = true; 4199 } 4200 } 4201 if (has_illegal_visibility(flags)) { 4202 is_illegal = true; 4203 } 4204 } 4205 } 4206 4207 if (is_illegal) { 4208 ResourceMark rm(THREAD); 4209 Exceptions::fthrow( 4210 THREAD_AND_LOCATION, 4211 vmSymbols::java_lang_ClassFormatError(), 4212 "Method %s in class %s has illegal modifiers: 0x%X", 4213 name->as_C_string(), _class_name->as_C_string(), flags); 4214 return; 4215 } 4216 } 4217 4218 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 4219 assert(_need_verify, "only called when _need_verify is true"); 4220 int i = 0; 4221 int count = length >> 2; 4222 for (int k=0; k<count; k++) { 4223 unsigned char b0 = buffer[i]; 4224 unsigned char b1 = buffer[i+1]; 4225 unsigned char b2 = buffer[i+2]; 4226 unsigned char b3 = buffer[i+3]; 4227 // For an unsigned char v, 4228 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 4229 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 4230 unsigned char res = b0 | b0 - 1 | 4231 b1 | b1 - 1 | 4232 b2 | b2 - 1 | 4233 b3 | b3 - 1; 4234 if (res >= 128) break; 4235 i += 4; 4236 } 4237 for(; i < length; i++) { 4238 unsigned short c; 4239 // no embedded zeros 4240 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 4241 if(buffer[i] < 128) { 4242 continue; 4243 } 4244 if ((i + 5) < length) { // see if it's legal supplementary character 4245 if (UTF8::is_supplementary_character(&buffer[i])) { 4246 c = UTF8::get_supplementary_character(&buffer[i]); 4247 i += 5; 4248 continue; 4249 } 4250 } 4251 switch (buffer[i] >> 4) { 4252 default: break; 4253 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 4254 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4255 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 4256 c = (buffer[i] & 0x1F) << 6; 4257 i++; 4258 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 4259 c += buffer[i] & 0x3F; 4260 if (_major_version <= 47 || c == 0 || c >= 0x80) { 4261 // for classes with major > 47, c must a null or a character in its shortest form 4262 break; 4263 } 4264 } 4265 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4266 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 4267 c = (buffer[i] & 0xF) << 12; 4268 i += 2; 4269 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 4270 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 4271 if (_major_version <= 47 || c >= 0x800) { 4272 // for classes with major > 47, c must be in its shortest form 4273 break; 4274 } 4275 } 4276 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4277 } // end of switch 4278 } // end of for 4279 } 4280 4281 // Checks if name is a legal class name. 4282 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) { 4283 if (!_need_verify || _relax_verify) { return; } 4284 4285 char buf[fixed_buffer_size]; 4286 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4287 unsigned int length = name->utf8_length(); 4288 bool legal = false; 4289 4290 if (length > 0) { 4291 char* p; 4292 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 4293 p = skip_over_field_signature(bytes, false, length, CHECK); 4294 legal = (p != NULL) && ((p - bytes) == (int)length); 4295 } else if (_major_version < JAVA_1_5_VERSION) { 4296 if (bytes[0] != '<') { 4297 p = skip_over_field_name(bytes, true, length); 4298 legal = (p != NULL) && ((p - bytes) == (int)length); 4299 } 4300 } else { 4301 // 4900761: relax the constraints based on JSR202 spec 4302 // Class names may be drawn from the entire Unicode character set. 4303 // Identifiers between '/' must be unqualified names. 4304 // The utf8 string has been verified when parsing cpool entries. 4305 legal = verify_unqualified_name(bytes, length, LegalClass); 4306 } 4307 } 4308 if (!legal) { 4309 ResourceMark rm(THREAD); 4310 Exceptions::fthrow( 4311 THREAD_AND_LOCATION, 4312 vmSymbols::java_lang_ClassFormatError(), 4313 "Illegal class name \"%s\" in class file %s", bytes, 4314 _class_name->as_C_string() 4315 ); 4316 return; 4317 } 4318 } 4319 4320 // Checks if name is a legal field name. 4321 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) { 4322 if (!_need_verify || _relax_verify) { return; } 4323 4324 char buf[fixed_buffer_size]; 4325 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4326 unsigned int length = name->utf8_length(); 4327 bool legal = false; 4328 4329 if (length > 0) { 4330 if (_major_version < JAVA_1_5_VERSION) { 4331 if (bytes[0] != '<') { 4332 char* p = skip_over_field_name(bytes, false, length); 4333 legal = (p != NULL) && ((p - bytes) == (int)length); 4334 } 4335 } else { 4336 // 4881221: relax the constraints based on JSR202 spec 4337 legal = verify_unqualified_name(bytes, length, LegalField); 4338 } 4339 } 4340 4341 if (!legal) { 4342 ResourceMark rm(THREAD); 4343 Exceptions::fthrow( 4344 THREAD_AND_LOCATION, 4345 vmSymbols::java_lang_ClassFormatError(), 4346 "Illegal field name \"%s\" in class %s", bytes, 4347 _class_name->as_C_string() 4348 ); 4349 return; 4350 } 4351 } 4352 4353 // Checks if name is a legal method name. 4354 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) { 4355 if (!_need_verify || _relax_verify) { return; } 4356 4357 assert(name != NULL, "method name is null"); 4358 char buf[fixed_buffer_size]; 4359 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4360 unsigned int length = name->utf8_length(); 4361 bool legal = false; 4362 4363 if (length > 0) { 4364 if (bytes[0] == '<') { 4365 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 4366 legal = true; 4367 } 4368 } else if (_major_version < JAVA_1_5_VERSION) { 4369 char* p; 4370 p = skip_over_field_name(bytes, false, length); 4371 legal = (p != NULL) && ((p - bytes) == (int)length); 4372 } else { 4373 // 4881221: relax the constraints based on JSR202 spec 4374 legal = verify_unqualified_name(bytes, length, LegalMethod); 4375 } 4376 } 4377 4378 if (!legal) { 4379 ResourceMark rm(THREAD); 4380 Exceptions::fthrow( 4381 THREAD_AND_LOCATION, 4382 vmSymbols::java_lang_ClassFormatError(), 4383 "Illegal method name \"%s\" in class %s", bytes, 4384 _class_name->as_C_string() 4385 ); 4386 return; 4387 } 4388 } 4389 4390 4391 // Checks if signature is a legal field signature. 4392 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) { 4393 if (!_need_verify) { return; } 4394 4395 char buf[fixed_buffer_size]; 4396 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4397 unsigned int length = signature->utf8_length(); 4398 char* p = skip_over_field_signature(bytes, false, length, CHECK); 4399 4400 if (p == NULL || (p - bytes) != (int)length) { 4401 throwIllegalSignature("Field", name, signature, CHECK); 4402 } 4403 } 4404 4405 // Checks if signature is a legal method signature. 4406 // Returns number of parameters 4407 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) { 4408 if (!_need_verify) { 4409 // make sure caller's args_size will be less than 0 even for non-static 4410 // method so it will be recomputed in compute_size_of_parameters(). 4411 return -2; 4412 } 4413 4414 unsigned int args_size = 0; 4415 char buf[fixed_buffer_size]; 4416 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4417 unsigned int length = signature->utf8_length(); 4418 char* nextp; 4419 4420 // The first character must be a '(' 4421 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 4422 length--; 4423 // Skip over legal field signatures 4424 nextp = skip_over_field_signature(p, false, length, CHECK_0); 4425 while ((length > 0) && (nextp != NULL)) { 4426 args_size++; 4427 if (p[0] == 'J' || p[0] == 'D') { 4428 args_size++; 4429 } 4430 length -= nextp - p; 4431 p = nextp; 4432 nextp = skip_over_field_signature(p, false, length, CHECK_0); 4433 } 4434 // The first non-signature thing better be a ')' 4435 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 4436 length--; 4437 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 4438 // All internal methods must return void 4439 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 4440 return args_size; 4441 } 4442 } else { 4443 // Now we better just have a return value 4444 nextp = skip_over_field_signature(p, true, length, CHECK_0); 4445 if (nextp && ((int)length == (nextp - p))) { 4446 return args_size; 4447 } 4448 } 4449 } 4450 } 4451 // Report error 4452 throwIllegalSignature("Method", name, signature, CHECK_0); 4453 return 0; 4454 } 4455 4456 4457 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 4458 // Method names also may not contain the characters '<' or '>', unless <init> 4459 // or <clinit>. Note that method names may not be <init> or <clinit> in this 4460 // method. Because these names have been checked as special cases before 4461 // calling this method in verify_legal_method_name. 4462 bool ClassFileParser::verify_unqualified_name( 4463 char* name, unsigned int length, int type) { 4464 jchar ch; 4465 4466 for (char* p = name; p != name + length; ) { 4467 ch = *p; 4468 if (ch < 128) { 4469 p++; 4470 if (ch == '.' || ch == ';' || ch == '[' ) { 4471 return false; // do not permit '.', ';', or '[' 4472 } 4473 if (type != LegalClass && ch == '/') { 4474 return false; // do not permit '/' unless it's class name 4475 } 4476 if (type == LegalMethod && (ch == '<' || ch == '>')) { 4477 return false; // do not permit '<' or '>' in method names 4478 } 4479 } else { 4480 char* tmp_p = UTF8::next(p, &ch); 4481 p = tmp_p; 4482 } 4483 } 4484 return true; 4485 } 4486 4487 4488 // Take pointer to a string. Skip over the longest part of the string that could 4489 // be taken as a fieldname. Allow '/' if slash_ok is true. 4490 // Return a pointer to just past the fieldname. 4491 // Return NULL if no fieldname at all was found, or in the case of slash_ok 4492 // being true, we saw consecutive slashes (meaning we were looking for a 4493 // qualified path but found something that was badly-formed). 4494 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 4495 char* p; 4496 jchar ch; 4497 jboolean last_is_slash = false; 4498 jboolean not_first_ch = false; 4499 4500 for (p = name; p != name + length; not_first_ch = true) { 4501 char* old_p = p; 4502 ch = *p; 4503 if (ch < 128) { 4504 p++; 4505 // quick check for ascii 4506 if ((ch >= 'a' && ch <= 'z') || 4507 (ch >= 'A' && ch <= 'Z') || 4508 (ch == '_' || ch == '$') || 4509 (not_first_ch && ch >= '0' && ch <= '9')) { 4510 last_is_slash = false; 4511 continue; 4512 } 4513 if (slash_ok && ch == '/') { 4514 if (last_is_slash) { 4515 return NULL; // Don't permit consecutive slashes 4516 } 4517 last_is_slash = true; 4518 continue; 4519 } 4520 } else { 4521 jint unicode_ch; 4522 char* tmp_p = UTF8::next_character(p, &unicode_ch); 4523 p = tmp_p; 4524 last_is_slash = false; 4525 // Check if ch is Java identifier start or is Java identifier part 4526 // 4672820: call java.lang.Character methods directly without generating separate tables. 4527 EXCEPTION_MARK; 4528 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass()); 4529 4530 // return value 4531 JavaValue result(T_BOOLEAN); 4532 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 4533 JavaCallArguments args; 4534 args.push_int(unicode_ch); 4535 4536 // public static boolean isJavaIdentifierStart(char ch); 4537 JavaCalls::call_static(&result, 4538 klass, 4539 vmSymbols::isJavaIdentifierStart_name(), 4540 vmSymbols::int_bool_signature(), 4541 &args, 4542 THREAD); 4543 4544 if (HAS_PENDING_EXCEPTION) { 4545 CLEAR_PENDING_EXCEPTION; 4546 return 0; 4547 } 4548 if (result.get_jboolean()) { 4549 continue; 4550 } 4551 4552 if (not_first_ch) { 4553 // public static boolean isJavaIdentifierPart(char ch); 4554 JavaCalls::call_static(&result, 4555 klass, 4556 vmSymbols::isJavaIdentifierPart_name(), 4557 vmSymbols::int_bool_signature(), 4558 &args, 4559 THREAD); 4560 4561 if (HAS_PENDING_EXCEPTION) { 4562 CLEAR_PENDING_EXCEPTION; 4563 return 0; 4564 } 4565 4566 if (result.get_jboolean()) { 4567 continue; 4568 } 4569 } 4570 } 4571 return (not_first_ch) ? old_p : NULL; 4572 } 4573 return (not_first_ch) ? p : NULL; 4574 } 4575 4576 4577 // Take pointer to a string. Skip over the longest part of the string that could 4578 // be taken as a field signature. Allow "void" if void_ok. 4579 // Return a pointer to just past the signature. 4580 // Return NULL if no legal signature is found. 4581 char* ClassFileParser::skip_over_field_signature(char* signature, 4582 bool void_ok, 4583 unsigned int length, 4584 TRAPS) { 4585 unsigned int array_dim = 0; 4586 while (length > 0) { 4587 switch (signature[0]) { 4588 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 4589 case JVM_SIGNATURE_BOOLEAN: 4590 case JVM_SIGNATURE_BYTE: 4591 case JVM_SIGNATURE_CHAR: 4592 case JVM_SIGNATURE_SHORT: 4593 case JVM_SIGNATURE_INT: 4594 case JVM_SIGNATURE_FLOAT: 4595 case JVM_SIGNATURE_LONG: 4596 case JVM_SIGNATURE_DOUBLE: 4597 return signature + 1; 4598 case JVM_SIGNATURE_CLASS: { 4599 if (_major_version < JAVA_1_5_VERSION) { 4600 // Skip over the class name if one is there 4601 char* p = skip_over_field_name(signature + 1, true, --length); 4602 4603 // The next character better be a semicolon 4604 if (p && (p - signature) > 1 && p[0] == ';') { 4605 return p + 1; 4606 } 4607 } else { 4608 // 4900761: For class version > 48, any unicode is allowed in class name. 4609 length--; 4610 signature++; 4611 while (length > 0 && signature[0] != ';') { 4612 if (signature[0] == '.') { 4613 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 4614 } 4615 length--; 4616 signature++; 4617 } 4618 if (signature[0] == ';') { return signature + 1; } 4619 } 4620 4621 return NULL; 4622 } 4623 case JVM_SIGNATURE_ARRAY: 4624 array_dim++; 4625 if (array_dim > 255) { 4626 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 4627 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 4628 } 4629 // The rest of what's there better be a legal signature 4630 signature++; 4631 length--; 4632 void_ok = false; 4633 break; 4634 4635 default: 4636 return NULL; 4637 } 4638 } 4639 return NULL; 4640 }