1 /* 2 * Copyright (c) 1997, 2009, 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 "incls/_precompiled.incl" 26 #include "incls/_classFileParser.cpp.incl" 27 28 // We generally try to create the oops directly when parsing, rather than 29 // allocating temporary data structures and copying the bytes twice. A 30 // temporary area is only needed when parsing utf8 entries in the constant 31 // pool and when parsing line number tables. 32 33 // We add assert in debug mode when class format is not checked. 34 35 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 36 #define JAVA_MIN_SUPPORTED_VERSION 45 37 #define JAVA_MAX_SUPPORTED_VERSION 51 38 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 39 40 // Used for two backward compatibility reasons: 41 // - to check for new additions to the class file format in JDK1.5 42 // - to check for bug fixes in the format checker in JDK1.5 43 #define JAVA_1_5_VERSION 49 44 45 // Used for backward compatibility reasons: 46 // - to check for javac bug fixes that happened after 1.5 47 // - also used as the max version when running in jdk6 48 #define JAVA_6_VERSION 50 49 50 // Used for backward compatibility reasons: 51 // - to check NameAndType_info signatures more aggressively 52 #define JAVA_7_VERSION 51 53 54 55 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) { 56 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 57 // this function (_current can be allocated in a register, with scalar 58 // replacement of aggregates). The _current pointer is copied back to 59 // stream() when this function returns. DON'T call another method within 60 // this method that uses stream(). 61 ClassFileStream* cfs0 = stream(); 62 ClassFileStream cfs1 = *cfs0; 63 ClassFileStream* cfs = &cfs1; 64 #ifdef ASSERT 65 assert(cfs->allocated_on_stack(),"should be local"); 66 u1* old_current = cfs0->current(); 67 #endif 68 69 // Used for batching symbol allocations. 70 const char* names[SymbolTable::symbol_alloc_batch_size]; 71 int lengths[SymbolTable::symbol_alloc_batch_size]; 72 int indices[SymbolTable::symbol_alloc_batch_size]; 73 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 74 int names_count = 0; 75 76 // parsing Index 0 is unused 77 for (int index = 1; index < length; index++) { 78 // Each of the following case guarantees one more byte in the stream 79 // for the following tag or the access_flags following constant pool, 80 // so we don't need bounds-check for reading tag. 81 u1 tag = cfs->get_u1_fast(); 82 switch (tag) { 83 case JVM_CONSTANT_Class : 84 { 85 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 86 u2 name_index = cfs->get_u2_fast(); 87 cp->klass_index_at_put(index, name_index); 88 } 89 break; 90 case JVM_CONSTANT_Fieldref : 91 { 92 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 93 u2 class_index = cfs->get_u2_fast(); 94 u2 name_and_type_index = cfs->get_u2_fast(); 95 cp->field_at_put(index, class_index, name_and_type_index); 96 } 97 break; 98 case JVM_CONSTANT_Methodref : 99 { 100 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 101 u2 class_index = cfs->get_u2_fast(); 102 u2 name_and_type_index = cfs->get_u2_fast(); 103 cp->method_at_put(index, class_index, name_and_type_index); 104 } 105 break; 106 case JVM_CONSTANT_InterfaceMethodref : 107 { 108 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 109 u2 class_index = cfs->get_u2_fast(); 110 u2 name_and_type_index = cfs->get_u2_fast(); 111 cp->interface_method_at_put(index, class_index, name_and_type_index); 112 } 113 break; 114 case JVM_CONSTANT_String : 115 { 116 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 117 u2 string_index = cfs->get_u2_fast(); 118 cp->string_index_at_put(index, string_index); 119 } 120 break; 121 case JVM_CONSTANT_MethodHandle : 122 case JVM_CONSTANT_MethodType : 123 if (!EnableMethodHandles || 124 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 125 classfile_parse_error( 126 (!EnableMethodHandles ? 127 "This JVM does not support constant tag %u in class file %s" : 128 "Class file version does not support constant tag %u in class file %s"), 129 tag, CHECK); 130 } 131 if (tag == JVM_CONSTANT_MethodHandle) { 132 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 133 u1 ref_kind = cfs->get_u1_fast(); 134 u2 method_index = cfs->get_u2_fast(); 135 cp->method_handle_index_at_put(index, ref_kind, method_index); 136 } else if (tag == JVM_CONSTANT_MethodType) { 137 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 138 u2 signature_index = cfs->get_u2_fast(); 139 cp->method_type_index_at_put(index, signature_index); 140 } else { 141 ShouldNotReachHere(); 142 } 143 break; 144 case JVM_CONSTANT_InvokeDynamic : 145 { 146 if (!EnableInvokeDynamic || 147 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 148 classfile_parse_error( 149 (!EnableInvokeDynamic ? 150 "This JVM does not support constant tag %u in class file %s" : 151 "Class file version does not support constant tag %u in class file %s"), 152 tag, CHECK); 153 } 154 cfs->guarantee_more(5, CHECK); // bsm_index, name_and_type_index, tag/access_flags 155 u2 bootstrap_method_index = cfs->get_u2_fast(); 156 u2 name_and_type_index = cfs->get_u2_fast(); 157 cp->invoke_dynamic_at_put(index, bootstrap_method_index, name_and_type_index); 158 } 159 break; 160 case JVM_CONSTANT_Integer : 161 { 162 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 163 u4 bytes = cfs->get_u4_fast(); 164 cp->int_at_put(index, (jint) bytes); 165 } 166 break; 167 case JVM_CONSTANT_Float : 168 { 169 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 170 u4 bytes = cfs->get_u4_fast(); 171 cp->float_at_put(index, *(jfloat*)&bytes); 172 } 173 break; 174 case JVM_CONSTANT_Long : 175 // A mangled type might cause you to overrun allocated memory 176 guarantee_property(index+1 < length, 177 "Invalid constant pool entry %u in class file %s", 178 index, CHECK); 179 { 180 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 181 u8 bytes = cfs->get_u8_fast(); 182 cp->long_at_put(index, bytes); 183 } 184 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 185 break; 186 case JVM_CONSTANT_Double : 187 // A mangled type might cause you to overrun allocated memory 188 guarantee_property(index+1 < length, 189 "Invalid constant pool entry %u in class file %s", 190 index, CHECK); 191 { 192 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 193 u8 bytes = cfs->get_u8_fast(); 194 cp->double_at_put(index, *(jdouble*)&bytes); 195 } 196 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 197 break; 198 case JVM_CONSTANT_NameAndType : 199 { 200 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 201 u2 name_index = cfs->get_u2_fast(); 202 u2 signature_index = cfs->get_u2_fast(); 203 cp->name_and_type_at_put(index, name_index, signature_index); 204 } 205 break; 206 case JVM_CONSTANT_Utf8 : 207 { 208 cfs->guarantee_more(2, CHECK); // utf8_length 209 u2 utf8_length = cfs->get_u2_fast(); 210 u1* utf8_buffer = cfs->get_u1_buffer(); 211 assert(utf8_buffer != NULL, "null utf8 buffer"); 212 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 213 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 214 cfs->skip_u1_fast(utf8_length); 215 216 // Before storing the symbol, make sure it's legal 217 if (_need_verify) { 218 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); 219 } 220 221 if (AnonymousClasses && has_cp_patch_at(index)) { 222 Handle patch = clear_cp_patch_at(index); 223 guarantee_property(java_lang_String::is_instance(patch()), 224 "Illegal utf8 patch at %d in class file %s", 225 index, CHECK); 226 char* str = java_lang_String::as_utf8_string(patch()); 227 // (could use java_lang_String::as_symbol instead, but might as well batch them) 228 utf8_buffer = (u1*) str; 229 utf8_length = (int) strlen(str); 230 } 231 232 unsigned int hash; 233 symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); 234 if (result == NULL) { 235 names[names_count] = (char*)utf8_buffer; 236 lengths[names_count] = utf8_length; 237 indices[names_count] = index; 238 hashValues[names_count++] = hash; 239 if (names_count == SymbolTable::symbol_alloc_batch_size) { 240 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK); 241 names_count = 0; 242 } 243 } else { 244 cp->symbol_at_put(index, result); 245 } 246 } 247 break; 248 default: 249 classfile_parse_error( 250 "Unknown constant tag %u in class file %s", tag, CHECK); 251 break; 252 } 253 } 254 255 // Allocate the remaining symbols 256 if (names_count > 0) { 257 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK); 258 } 259 260 // Copy _current pointer of local copy back to stream(). 261 #ifdef ASSERT 262 assert(cfs0->current() == old_current, "non-exclusive use of stream()"); 263 #endif 264 cfs0->set_current(cfs1.current()); 265 } 266 267 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } 268 269 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { 270 ClassFileStream* cfs = stream(); 271 constantPoolHandle nullHandle; 272 273 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag 274 u2 length = cfs->get_u2_fast(); 275 guarantee_property( 276 length >= 1, "Illegal constant pool size %u in class file %s", 277 length, CHECK_(nullHandle)); 278 constantPoolOop constant_pool = 279 oopFactory::new_constantPool(length, 280 methodOopDesc::IsSafeConc, 281 CHECK_(nullHandle)); 282 constantPoolHandle cp (THREAD, constant_pool); 283 284 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops 285 286 // parsing constant pool entries 287 parse_constant_pool_entries(cp, length, CHECK_(nullHandle)); 288 289 int index = 1; // declared outside of loops for portability 290 291 // first verification pass - validate cross references and fixup class and string constants 292 for (index = 1; index < length; index++) { // Index 0 is unused 293 switch (cp->tag_at(index).value()) { 294 case JVM_CONSTANT_Class : 295 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 296 break; 297 case JVM_CONSTANT_Fieldref : 298 // fall through 299 case JVM_CONSTANT_Methodref : 300 // fall through 301 case JVM_CONSTANT_InterfaceMethodref : { 302 if (!_need_verify) break; 303 int klass_ref_index = cp->klass_ref_index_at(index); 304 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 305 check_property(valid_cp_range(klass_ref_index, length) && 306 is_klass_reference(cp, klass_ref_index), 307 "Invalid constant pool index %u in class file %s", 308 klass_ref_index, 309 CHECK_(nullHandle)); 310 check_property(valid_cp_range(name_and_type_ref_index, length) && 311 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 312 "Invalid constant pool index %u in class file %s", 313 name_and_type_ref_index, 314 CHECK_(nullHandle)); 315 break; 316 } 317 case JVM_CONSTANT_String : 318 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 319 break; 320 case JVM_CONSTANT_Integer : 321 break; 322 case JVM_CONSTANT_Float : 323 break; 324 case JVM_CONSTANT_Long : 325 case JVM_CONSTANT_Double : 326 index++; 327 check_property( 328 (index < length && cp->tag_at(index).is_invalid()), 329 "Improper constant pool long/double index %u in class file %s", 330 index, CHECK_(nullHandle)); 331 break; 332 case JVM_CONSTANT_NameAndType : { 333 if (!_need_verify) break; 334 int name_ref_index = cp->name_ref_index_at(index); 335 int signature_ref_index = cp->signature_ref_index_at(index); 336 check_property( 337 valid_cp_range(name_ref_index, length) && 338 cp->tag_at(name_ref_index).is_utf8(), 339 "Invalid constant pool index %u in class file %s", 340 name_ref_index, CHECK_(nullHandle)); 341 check_property( 342 valid_cp_range(signature_ref_index, length) && 343 cp->tag_at(signature_ref_index).is_utf8(), 344 "Invalid constant pool index %u in class file %s", 345 signature_ref_index, CHECK_(nullHandle)); 346 break; 347 } 348 case JVM_CONSTANT_Utf8 : 349 break; 350 case JVM_CONSTANT_UnresolvedClass : // fall-through 351 case JVM_CONSTANT_UnresolvedClassInError: 352 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 353 break; 354 case JVM_CONSTANT_ClassIndex : 355 { 356 int class_index = cp->klass_index_at(index); 357 check_property( 358 valid_cp_range(class_index, length) && 359 cp->tag_at(class_index).is_utf8(), 360 "Invalid constant pool index %u in class file %s", 361 class_index, CHECK_(nullHandle)); 362 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 363 } 364 break; 365 case JVM_CONSTANT_UnresolvedString : 366 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 367 break; 368 case JVM_CONSTANT_StringIndex : 369 { 370 int string_index = cp->string_index_at(index); 371 check_property( 372 valid_cp_range(string_index, length) && 373 cp->tag_at(string_index).is_utf8(), 374 "Invalid constant pool index %u in class file %s", 375 string_index, CHECK_(nullHandle)); 376 symbolOop sym = cp->symbol_at(string_index); 377 cp->unresolved_string_at_put(index, sym); 378 } 379 break; 380 case JVM_CONSTANT_MethodHandle : 381 { 382 int ref_index = cp->method_handle_index_at(index); 383 check_property( 384 valid_cp_range(ref_index, length) && 385 EnableMethodHandles, 386 "Invalid constant pool index %u in class file %s", 387 ref_index, CHECK_(nullHandle)); 388 constantTag tag = cp->tag_at(ref_index); 389 int ref_kind = cp->method_handle_ref_kind_at(index); 390 switch (ref_kind) { 391 case JVM_REF_getField: 392 case JVM_REF_getStatic: 393 case JVM_REF_putField: 394 case JVM_REF_putStatic: 395 check_property( 396 tag.is_field(), 397 "Invalid constant pool index %u in class file %s (not a field)", 398 ref_index, CHECK_(nullHandle)); 399 break; 400 case JVM_REF_invokeVirtual: 401 case JVM_REF_invokeStatic: 402 case JVM_REF_invokeSpecial: 403 case JVM_REF_newInvokeSpecial: 404 check_property( 405 tag.is_method(), 406 "Invalid constant pool index %u in class file %s (not a method)", 407 ref_index, CHECK_(nullHandle)); 408 break; 409 case JVM_REF_invokeInterface: 410 check_property( 411 tag.is_interface_method(), 412 "Invalid constant pool index %u in class file %s (not an interface method)", 413 ref_index, CHECK_(nullHandle)); 414 break; 415 default: 416 classfile_parse_error( 417 "Bad method handle kind at constant pool index %u in class file %s", 418 index, CHECK_(nullHandle)); 419 } 420 // Keep the ref_index unchanged. It will be indirected at link-time. 421 } 422 break; 423 case JVM_CONSTANT_MethodType : 424 { 425 int ref_index = cp->method_type_index_at(index); 426 check_property( 427 valid_cp_range(ref_index, length) && 428 cp->tag_at(ref_index).is_utf8() && 429 EnableMethodHandles, 430 "Invalid constant pool index %u in class file %s", 431 ref_index, CHECK_(nullHandle)); 432 } 433 break; 434 case JVM_CONSTANT_InvokeDynamic : 435 { 436 int bootstrap_method_ref_index = cp->invoke_dynamic_bootstrap_method_ref_index_at(index); 437 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index); 438 check_property((bootstrap_method_ref_index == 0 && AllowTransitionalJSR292) 439 || 440 (valid_cp_range(bootstrap_method_ref_index, length) && 441 cp->tag_at(bootstrap_method_ref_index).is_method_handle()), 442 "Invalid constant pool index %u in class file %s", 443 bootstrap_method_ref_index, 444 CHECK_(nullHandle)); 445 check_property(valid_cp_range(name_and_type_ref_index, length) && 446 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 447 "Invalid constant pool index %u in class file %s", 448 name_and_type_ref_index, 449 CHECK_(nullHandle)); 450 break; 451 } 452 default: 453 fatal(err_msg("bad constant pool tag value %u", 454 cp->tag_at(index).value())); 455 ShouldNotReachHere(); 456 break; 457 } // end of switch 458 } // end of for 459 460 if (_cp_patches != NULL) { 461 // need to treat this_class specially... 462 assert(AnonymousClasses, ""); 463 int this_class_index; 464 { 465 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 466 u1* mark = cfs->current(); 467 u2 flags = cfs->get_u2_fast(); 468 this_class_index = cfs->get_u2_fast(); 469 cfs->set_current(mark); // revert to mark 470 } 471 472 for (index = 1; index < length; index++) { // Index 0 is unused 473 if (has_cp_patch_at(index)) { 474 guarantee_property(index != this_class_index, 475 "Illegal constant pool patch to self at %d in class file %s", 476 index, CHECK_(nullHandle)); 477 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); 478 } 479 } 480 // Ensure that all the patches have been used. 481 for (index = 0; index < _cp_patches->length(); index++) { 482 guarantee_property(!has_cp_patch_at(index), 483 "Unused constant pool patch at %d in class file %s", 484 index, CHECK_(nullHandle)); 485 } 486 } 487 488 if (!_need_verify) { 489 return cp; 490 } 491 492 // second verification pass - checks the strings are of the right format. 493 // but not yet to the other entries 494 for (index = 1; index < length; index++) { 495 jbyte tag = cp->tag_at(index).value(); 496 switch (tag) { 497 case JVM_CONSTANT_UnresolvedClass: { 498 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index)); 499 // check the name, even if _cp_patches will overwrite it 500 verify_legal_class_name(class_name, CHECK_(nullHandle)); 501 break; 502 } 503 case JVM_CONSTANT_NameAndType: { 504 if (_need_verify && _major_version >= JAVA_7_VERSION) { 505 int sig_index = cp->signature_ref_index_at(index); 506 int name_index = cp->name_ref_index_at(index); 507 symbolHandle name(THREAD, cp->symbol_at(name_index)); 508 symbolHandle sig(THREAD, cp->symbol_at(sig_index)); 509 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 510 verify_legal_method_signature(name, sig, CHECK_(nullHandle)); 511 } else { 512 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 513 } 514 } 515 break; 516 } 517 case JVM_CONSTANT_Fieldref: 518 case JVM_CONSTANT_Methodref: 519 case JVM_CONSTANT_InterfaceMethodref: { 520 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 521 // already verified to be utf8 522 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 523 // already verified to be utf8 524 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 525 symbolHandle name(THREAD, cp->symbol_at(name_ref_index)); 526 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index)); 527 if (tag == JVM_CONSTANT_Fieldref) { 528 verify_legal_field_name(name, CHECK_(nullHandle)); 529 if (_need_verify && _major_version >= JAVA_7_VERSION) { 530 // Signature is verified above, when iterating NameAndType_info. 531 // Need only to be sure it's the right type. 532 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 533 throwIllegalSignature( 534 "Field", name, signature, CHECK_(nullHandle)); 535 } 536 } else { 537 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 538 } 539 } else { 540 verify_legal_method_name(name, CHECK_(nullHandle)); 541 if (_need_verify && _major_version >= JAVA_7_VERSION) { 542 // Signature is verified above, when iterating NameAndType_info. 543 // Need only to be sure it's the right type. 544 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 545 throwIllegalSignature( 546 "Method", name, signature, CHECK_(nullHandle)); 547 } 548 } else { 549 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 550 } 551 if (tag == JVM_CONSTANT_Methodref) { 552 // 4509014: If a class method name begins with '<', it must be "<init>". 553 assert(!name.is_null(), "method name in constant pool is null"); 554 unsigned int name_len = name->utf8_length(); 555 assert(name_len > 0, "bad method name"); // already verified as legal name 556 if (name->byte_at(0) == '<') { 557 if (name() != vmSymbols::object_initializer_name()) { 558 classfile_parse_error( 559 "Bad method name at constant pool index %u in class file %s", 560 name_ref_index, CHECK_(nullHandle)); 561 } 562 } 563 } 564 } 565 break; 566 } 567 case JVM_CONSTANT_MethodHandle: { 568 int ref_index = cp->method_handle_index_at(index); 569 int ref_kind = cp->method_handle_ref_kind_at(index); 570 switch (ref_kind) { 571 case JVM_REF_invokeVirtual: 572 case JVM_REF_invokeStatic: 573 case JVM_REF_invokeSpecial: 574 case JVM_REF_newInvokeSpecial: 575 { 576 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index); 577 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 578 symbolHandle name(THREAD, cp->symbol_at(name_ref_index)); 579 if (ref_kind == JVM_REF_newInvokeSpecial) { 580 if (name() != vmSymbols::object_initializer_name()) { 581 classfile_parse_error( 582 "Bad constructor name at constant pool index %u in class file %s", 583 name_ref_index, CHECK_(nullHandle)); 584 } 585 } else { 586 if (name() == vmSymbols::object_initializer_name()) { 587 classfile_parse_error( 588 "Bad method name at constant pool index %u in class file %s", 589 name_ref_index, CHECK_(nullHandle)); 590 } 591 } 592 } 593 break; 594 // Other ref_kinds are already fully checked in previous pass. 595 } 596 break; 597 } 598 case JVM_CONSTANT_MethodType: { 599 symbolHandle no_name = vmSymbolHandles::type_name(); // place holder 600 symbolHandle signature(THREAD, cp->method_type_signature_at(index)); 601 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle)); 602 break; 603 } 604 } // end of switch 605 } // end of for 606 607 return cp; 608 } 609 610 611 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { 612 assert(AnonymousClasses, ""); 613 BasicType patch_type = T_VOID; 614 switch (cp->tag_at(index).value()) { 615 616 case JVM_CONSTANT_UnresolvedClass : 617 // Patching a class means pre-resolving it. 618 // The name in the constant pool is ignored. 619 if (java_lang_Class::is_instance(patch())) { 620 guarantee_property(!java_lang_Class::is_primitive(patch()), 621 "Illegal class patch at %d in class file %s", 622 index, CHECK); 623 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch())); 624 } else { 625 guarantee_property(java_lang_String::is_instance(patch()), 626 "Illegal class patch at %d in class file %s", 627 index, CHECK); 628 symbolHandle name = java_lang_String::as_symbol(patch(), CHECK); 629 cp->unresolved_klass_at_put(index, name()); 630 } 631 break; 632 633 case JVM_CONSTANT_UnresolvedString : 634 // Patching a string means pre-resolving it. 635 // The spelling in the constant pool is ignored. 636 // The constant reference may be any object whatever. 637 // If it is not a real interned string, the constant is referred 638 // to as a "pseudo-string", and must be presented to the CP 639 // explicitly, because it may require scavenging. 640 cp->pseudo_string_at_put(index, patch()); 641 break; 642 643 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; 644 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; 645 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; 646 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; 647 patch_prim: 648 { 649 jvalue value; 650 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 651 guarantee_property(value_type == patch_type, 652 "Illegal primitive patch at %d in class file %s", 653 index, CHECK); 654 switch (value_type) { 655 case T_INT: cp->int_at_put(index, value.i); break; 656 case T_FLOAT: cp->float_at_put(index, value.f); break; 657 case T_LONG: cp->long_at_put(index, value.j); break; 658 case T_DOUBLE: cp->double_at_put(index, value.d); break; 659 default: assert(false, ""); 660 } 661 } 662 break; 663 664 default: 665 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 666 guarantee_property(!has_cp_patch_at(index), 667 "Illegal unexpected patch at %d in class file %s", 668 index, CHECK); 669 return; 670 } 671 672 // On fall-through, mark the patch as used. 673 clear_cp_patch_at(index); 674 } 675 676 677 678 class NameSigHash: public ResourceObj { 679 public: 680 symbolOop _name; // name 681 symbolOop _sig; // signature 682 NameSigHash* _next; // Next entry in hash table 683 }; 684 685 686 #define HASH_ROW_SIZE 256 687 688 unsigned int hash(symbolOop name, symbolOop sig) { 689 unsigned int raw_hash = 0; 690 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 691 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 692 693 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 694 } 695 696 697 void initialize_hashtable(NameSigHash** table) { 698 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 699 } 700 701 // Return false if the name/sig combination is found in table. 702 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 703 // The old format checker uses heap sort to find duplicates. 704 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 705 // of table since we don't expect symbolOop's to move. 706 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) { 707 assert(name != NULL, "name in constant pool is NULL"); 708 709 // First lookup for duplicates 710 int index = hash(name, sig); 711 NameSigHash* entry = table[index]; 712 while (entry != NULL) { 713 if (entry->_name == name && entry->_sig == sig) { 714 return false; 715 } 716 entry = entry->_next; 717 } 718 719 // No duplicate is found, allocate a new entry and fill it. 720 entry = new NameSigHash(); 721 entry->_name = name; 722 entry->_sig = sig; 723 724 // Insert into hash table 725 entry->_next = table[index]; 726 table[index] = entry; 727 728 return true; 729 } 730 731 732 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp, 733 int length, 734 Handle class_loader, 735 Handle protection_domain, 736 symbolHandle class_name, 737 TRAPS) { 738 ClassFileStream* cfs = stream(); 739 assert(length > 0, "only called for length>0"); 740 objArrayHandle nullHandle; 741 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 742 objArrayHandle interfaces (THREAD, interface_oop); 743 744 int index; 745 for (index = 0; index < length; index++) { 746 u2 interface_index = cfs->get_u2(CHECK_(nullHandle)); 747 KlassHandle interf; 748 check_property( 749 valid_cp_range(interface_index, cp->length()) && 750 is_klass_reference(cp, interface_index), 751 "Interface name has bad constant pool index %u in class file %s", 752 interface_index, CHECK_(nullHandle)); 753 if (cp->tag_at(interface_index).is_klass()) { 754 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index)); 755 } else { 756 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index)); 757 758 // Don't need to check legal name because it's checked when parsing constant pool. 759 // But need to make sure it's not an array type. 760 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 761 "Bad interface name in class file %s", CHECK_(nullHandle)); 762 763 // Call resolve_super so classcircularity is checked 764 klassOop k = SystemDictionary::resolve_super_or_fail(class_name, 765 unresolved_klass, class_loader, protection_domain, 766 false, CHECK_(nullHandle)); 767 interf = KlassHandle(THREAD, k); 768 769 if (LinkWellKnownClasses) // my super type is well known to me 770 cp->klass_at_put(interface_index, interf()); // eagerly resolve 771 } 772 773 if (!Klass::cast(interf())->is_interface()) { 774 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle); 775 } 776 interfaces->obj_at_put(index, interf()); 777 } 778 779 if (!_need_verify || length <= 1) { 780 return interfaces; 781 } 782 783 // Check if there's any duplicates in interfaces 784 ResourceMark rm(THREAD); 785 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 786 THREAD, NameSigHash*, HASH_ROW_SIZE); 787 initialize_hashtable(interface_names); 788 bool dup = false; 789 { 790 debug_only(No_Safepoint_Verifier nsv;) 791 for (index = 0; index < length; index++) { 792 klassOop k = (klassOop)interfaces->obj_at(index); 793 symbolOop name = instanceKlass::cast(k)->name(); 794 // If no duplicates, add (name, NULL) in hashtable interface_names. 795 if (!put_after_lookup(name, NULL, interface_names)) { 796 dup = true; 797 break; 798 } 799 } 800 } 801 if (dup) { 802 classfile_parse_error("Duplicate interface name in class file %s", 803 CHECK_(nullHandle)); 804 } 805 806 return interfaces; 807 } 808 809 810 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) { 811 // Make sure the constant pool entry is of a type appropriate to this field 812 guarantee_property( 813 (constantvalue_index > 0 && 814 constantvalue_index < cp->length()), 815 "Bad initial value index %u in ConstantValue attribute in class file %s", 816 constantvalue_index, CHECK); 817 constantTag value_type = cp->tag_at(constantvalue_index); 818 switch ( cp->basic_type_for_signature_at(signature_index) ) { 819 case T_LONG: 820 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 821 break; 822 case T_FLOAT: 823 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 824 break; 825 case T_DOUBLE: 826 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 827 break; 828 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 829 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 830 break; 831 case T_OBJECT: 832 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 833 && (value_type.is_string() || value_type.is_unresolved_string())), 834 "Bad string initial value in class file %s", CHECK); 835 break; 836 default: 837 classfile_parse_error( 838 "Unable to set initial value %u in class file %s", 839 constantvalue_index, CHECK); 840 } 841 } 842 843 844 // Parse attributes for a field. 845 void ClassFileParser::parse_field_attributes(constantPoolHandle cp, 846 u2 attributes_count, 847 bool is_static, u2 signature_index, 848 u2* constantvalue_index_addr, 849 bool* is_synthetic_addr, 850 u2* generic_signature_index_addr, 851 typeArrayHandle* field_annotations, 852 TRAPS) { 853 ClassFileStream* cfs = stream(); 854 assert(attributes_count > 0, "length should be greater than 0"); 855 u2 constantvalue_index = 0; 856 u2 generic_signature_index = 0; 857 bool is_synthetic = false; 858 u1* runtime_visible_annotations = NULL; 859 int runtime_visible_annotations_length = 0; 860 u1* runtime_invisible_annotations = NULL; 861 int runtime_invisible_annotations_length = 0; 862 while (attributes_count--) { 863 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 864 u2 attribute_name_index = cfs->get_u2_fast(); 865 u4 attribute_length = cfs->get_u4_fast(); 866 check_property(valid_cp_range(attribute_name_index, cp->length()) && 867 cp->tag_at(attribute_name_index).is_utf8(), 868 "Invalid field attribute index %u in class file %s", 869 attribute_name_index, 870 CHECK); 871 symbolOop attribute_name = cp->symbol_at(attribute_name_index); 872 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 873 // ignore if non-static 874 if (constantvalue_index != 0) { 875 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 876 } 877 check_property( 878 attribute_length == 2, 879 "Invalid ConstantValue field attribute length %u in class file %s", 880 attribute_length, CHECK); 881 constantvalue_index = cfs->get_u2(CHECK); 882 if (_need_verify) { 883 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK); 884 } 885 } else if (attribute_name == vmSymbols::tag_synthetic()) { 886 if (attribute_length != 0) { 887 classfile_parse_error( 888 "Invalid Synthetic field attribute length %u in class file %s", 889 attribute_length, CHECK); 890 } 891 is_synthetic = true; 892 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 893 if (attribute_length != 0) { 894 classfile_parse_error( 895 "Invalid Deprecated field attribute length %u in class file %s", 896 attribute_length, CHECK); 897 } 898 } else if (_major_version >= JAVA_1_5_VERSION) { 899 if (attribute_name == vmSymbols::tag_signature()) { 900 if (attribute_length != 2) { 901 classfile_parse_error( 902 "Wrong size %u for field's Signature attribute in class file %s", 903 attribute_length, CHECK); 904 } 905 generic_signature_index = cfs->get_u2(CHECK); 906 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 907 runtime_visible_annotations_length = attribute_length; 908 runtime_visible_annotations = cfs->get_u1_buffer(); 909 assert(runtime_visible_annotations != NULL, "null visible annotations"); 910 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 911 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 912 runtime_invisible_annotations_length = attribute_length; 913 runtime_invisible_annotations = cfs->get_u1_buffer(); 914 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 915 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 916 } else { 917 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 918 } 919 } else { 920 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 921 } 922 } 923 924 *constantvalue_index_addr = constantvalue_index; 925 *is_synthetic_addr = is_synthetic; 926 *generic_signature_index_addr = generic_signature_index; 927 *field_annotations = assemble_annotations(runtime_visible_annotations, 928 runtime_visible_annotations_length, 929 runtime_invisible_annotations, 930 runtime_invisible_annotations_length, 931 CHECK); 932 return; 933 } 934 935 936 // Field allocation types. Used for computing field offsets. 937 938 enum FieldAllocationType { 939 STATIC_OOP, // Oops 940 STATIC_BYTE, // Boolean, Byte, char 941 STATIC_SHORT, // shorts 942 STATIC_WORD, // ints 943 STATIC_DOUBLE, // long or double 944 STATIC_ALIGNED_DOUBLE,// aligned long or double 945 NONSTATIC_OOP, 946 NONSTATIC_BYTE, 947 NONSTATIC_SHORT, 948 NONSTATIC_WORD, 949 NONSTATIC_DOUBLE, 950 NONSTATIC_ALIGNED_DOUBLE 951 }; 952 953 954 struct FieldAllocationCount { 955 unsigned int static_oop_count; 956 unsigned int static_byte_count; 957 unsigned int static_short_count; 958 unsigned int static_word_count; 959 unsigned int static_double_count; 960 unsigned int nonstatic_oop_count; 961 unsigned int nonstatic_byte_count; 962 unsigned int nonstatic_short_count; 963 unsigned int nonstatic_word_count; 964 unsigned int nonstatic_double_count; 965 }; 966 967 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface, 968 struct FieldAllocationCount *fac, 969 objArrayHandle* fields_annotations, TRAPS) { 970 ClassFileStream* cfs = stream(); 971 typeArrayHandle nullHandle; 972 cfs->guarantee_more(2, CHECK_(nullHandle)); // length 973 u2 length = cfs->get_u2_fast(); 974 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index] 975 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle)); 976 typeArrayHandle fields(THREAD, new_fields); 977 978 int index = 0; 979 typeArrayHandle field_annotations; 980 for (int n = 0; n < length; n++) { 981 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 982 983 AccessFlags access_flags; 984 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 985 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle)); 986 access_flags.set_flags(flags); 987 988 u2 name_index = cfs->get_u2_fast(); 989 int cp_size = cp->length(); 990 check_property( 991 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(), 992 "Invalid constant pool index %u for field name in class file %s", 993 name_index, CHECK_(nullHandle)); 994 symbolHandle name(THREAD, cp->symbol_at(name_index)); 995 verify_legal_field_name(name, CHECK_(nullHandle)); 996 997 u2 signature_index = cfs->get_u2_fast(); 998 check_property( 999 valid_cp_range(signature_index, cp_size) && 1000 cp->tag_at(signature_index).is_utf8(), 1001 "Invalid constant pool index %u for field signature in class file %s", 1002 signature_index, CHECK_(nullHandle)); 1003 symbolHandle sig(THREAD, cp->symbol_at(signature_index)); 1004 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 1005 1006 u2 constantvalue_index = 0; 1007 bool is_synthetic = false; 1008 u2 generic_signature_index = 0; 1009 bool is_static = access_flags.is_static(); 1010 1011 u2 attributes_count = cfs->get_u2_fast(); 1012 if (attributes_count > 0) { 1013 parse_field_attributes(cp, attributes_count, is_static, signature_index, 1014 &constantvalue_index, &is_synthetic, 1015 &generic_signature_index, &field_annotations, 1016 CHECK_(nullHandle)); 1017 if (field_annotations.not_null()) { 1018 if (fields_annotations->is_null()) { 1019 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1020 *fields_annotations = objArrayHandle(THREAD, md); 1021 } 1022 (*fields_annotations)->obj_at_put(n, field_annotations()); 1023 } 1024 if (is_synthetic) { 1025 access_flags.set_is_synthetic(); 1026 } 1027 } 1028 1029 fields->short_at_put(index++, access_flags.as_short()); 1030 fields->short_at_put(index++, name_index); 1031 fields->short_at_put(index++, signature_index); 1032 fields->short_at_put(index++, constantvalue_index); 1033 1034 // Remember how many oops we encountered and compute allocation type 1035 BasicType type = cp->basic_type_for_signature_at(signature_index); 1036 FieldAllocationType atype; 1037 if ( is_static ) { 1038 switch ( type ) { 1039 case T_BOOLEAN: 1040 case T_BYTE: 1041 fac->static_byte_count++; 1042 atype = STATIC_BYTE; 1043 break; 1044 case T_LONG: 1045 case T_DOUBLE: 1046 if (Universe::field_type_should_be_aligned(type)) { 1047 atype = STATIC_ALIGNED_DOUBLE; 1048 } else { 1049 atype = STATIC_DOUBLE; 1050 } 1051 fac->static_double_count++; 1052 break; 1053 case T_CHAR: 1054 case T_SHORT: 1055 fac->static_short_count++; 1056 atype = STATIC_SHORT; 1057 break; 1058 case T_FLOAT: 1059 case T_INT: 1060 fac->static_word_count++; 1061 atype = STATIC_WORD; 1062 break; 1063 case T_ARRAY: 1064 case T_OBJECT: 1065 fac->static_oop_count++; 1066 atype = STATIC_OOP; 1067 break; 1068 case T_ADDRESS: 1069 case T_VOID: 1070 default: 1071 assert(0, "bad field type"); 1072 } 1073 } else { 1074 switch ( type ) { 1075 case T_BOOLEAN: 1076 case T_BYTE: 1077 fac->nonstatic_byte_count++; 1078 atype = NONSTATIC_BYTE; 1079 break; 1080 case T_LONG: 1081 case T_DOUBLE: 1082 if (Universe::field_type_should_be_aligned(type)) { 1083 atype = NONSTATIC_ALIGNED_DOUBLE; 1084 } else { 1085 atype = NONSTATIC_DOUBLE; 1086 } 1087 fac->nonstatic_double_count++; 1088 break; 1089 case T_CHAR: 1090 case T_SHORT: 1091 fac->nonstatic_short_count++; 1092 atype = NONSTATIC_SHORT; 1093 break; 1094 case T_FLOAT: 1095 case T_INT: 1096 fac->nonstatic_word_count++; 1097 atype = NONSTATIC_WORD; 1098 break; 1099 case T_ARRAY: 1100 case T_OBJECT: 1101 fac->nonstatic_oop_count++; 1102 atype = NONSTATIC_OOP; 1103 break; 1104 case T_ADDRESS: 1105 case T_VOID: 1106 default: 1107 assert(0, "bad field type"); 1108 } 1109 } 1110 1111 // The correct offset is computed later (all oop fields will be located together) 1112 // We temporarily store the allocation type in the offset field 1113 fields->short_at_put(index++, atype); 1114 fields->short_at_put(index++, 0); // Clear out high word of byte offset 1115 fields->short_at_put(index++, generic_signature_index); 1116 } 1117 1118 if (_need_verify && length > 1) { 1119 // Check duplicated fields 1120 ResourceMark rm(THREAD); 1121 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1122 THREAD, NameSigHash*, HASH_ROW_SIZE); 1123 initialize_hashtable(names_and_sigs); 1124 bool dup = false; 1125 { 1126 debug_only(No_Safepoint_Verifier nsv;) 1127 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) { 1128 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset); 1129 symbolOop name = cp->symbol_at(name_index); 1130 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset); 1131 symbolOop sig = cp->symbol_at(sig_index); 1132 // If no duplicates, add name/signature in hashtable names_and_sigs. 1133 if (!put_after_lookup(name, sig, names_and_sigs)) { 1134 dup = true; 1135 break; 1136 } 1137 } 1138 } 1139 if (dup) { 1140 classfile_parse_error("Duplicate field name&signature in class file %s", 1141 CHECK_(nullHandle)); 1142 } 1143 } 1144 1145 return fields; 1146 } 1147 1148 1149 static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 1150 while (length-- > 0) { 1151 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 1152 } 1153 } 1154 1155 1156 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length, 1157 u4 exception_table_length, 1158 constantPoolHandle cp, 1159 TRAPS) { 1160 ClassFileStream* cfs = stream(); 1161 typeArrayHandle nullHandle; 1162 1163 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index] 1164 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle)); 1165 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh); 1166 1167 int index = 0; 1168 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index 1169 for (unsigned int i = 0; i < exception_table_length; i++) { 1170 u2 start_pc = cfs->get_u2_fast(); 1171 u2 end_pc = cfs->get_u2_fast(); 1172 u2 handler_pc = cfs->get_u2_fast(); 1173 u2 catch_type_index = cfs->get_u2_fast(); 1174 // Will check legal target after parsing code array in verifier. 1175 if (_need_verify) { 1176 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1177 "Illegal exception table range in class file %s", CHECK_(nullHandle)); 1178 guarantee_property(handler_pc < code_length, 1179 "Illegal exception table handler in class file %s", CHECK_(nullHandle)); 1180 if (catch_type_index != 0) { 1181 guarantee_property(valid_cp_range(catch_type_index, cp->length()) && 1182 is_klass_reference(cp, catch_type_index), 1183 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle)); 1184 } 1185 } 1186 exception_handlers->int_at_put(index++, start_pc); 1187 exception_handlers->int_at_put(index++, end_pc); 1188 exception_handlers->int_at_put(index++, handler_pc); 1189 exception_handlers->int_at_put(index++, catch_type_index); 1190 } 1191 return exception_handlers; 1192 } 1193 1194 void ClassFileParser::parse_linenumber_table( 1195 u4 code_attribute_length, u4 code_length, 1196 CompressedLineNumberWriteStream** write_stream, TRAPS) { 1197 ClassFileStream* cfs = stream(); 1198 unsigned int num_entries = cfs->get_u2(CHECK); 1199 1200 // Each entry is a u2 start_pc, and a u2 line_number 1201 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 1202 1203 // Verify line number attribute and table length 1204 check_property( 1205 code_attribute_length == sizeof(u2) + length_in_bytes, 1206 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1207 1208 cfs->guarantee_more(length_in_bytes, CHECK); 1209 1210 if ((*write_stream) == NULL) { 1211 if (length_in_bytes > fixed_buffer_size) { 1212 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1213 } else { 1214 (*write_stream) = new CompressedLineNumberWriteStream( 1215 linenumbertable_buffer, fixed_buffer_size); 1216 } 1217 } 1218 1219 while (num_entries-- > 0) { 1220 u2 bci = cfs->get_u2_fast(); // start_pc 1221 u2 line = cfs->get_u2_fast(); // line_number 1222 guarantee_property(bci < code_length, 1223 "Invalid pc in LineNumberTable in class file %s", CHECK); 1224 (*write_stream)->write_pair(bci, line); 1225 } 1226 } 1227 1228 1229 // Class file LocalVariableTable elements. 1230 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1231 public: 1232 u2 start_bci; 1233 u2 length; 1234 u2 name_cp_index; 1235 u2 descriptor_cp_index; 1236 u2 slot; 1237 }; 1238 1239 1240 class LVT_Hash: public CHeapObj { 1241 public: 1242 LocalVariableTableElement *_elem; // element 1243 LVT_Hash* _next; // Next entry in hash table 1244 }; 1245 1246 unsigned int hash(LocalVariableTableElement *elem) { 1247 unsigned int raw_hash = elem->start_bci; 1248 1249 raw_hash = elem->length + raw_hash * 37; 1250 raw_hash = elem->name_cp_index + raw_hash * 37; 1251 raw_hash = elem->slot + raw_hash * 37; 1252 1253 return raw_hash % HASH_ROW_SIZE; 1254 } 1255 1256 void initialize_hashtable(LVT_Hash** table) { 1257 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1258 table[i] = NULL; 1259 } 1260 } 1261 1262 void clear_hashtable(LVT_Hash** table) { 1263 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1264 LVT_Hash* current = table[i]; 1265 LVT_Hash* next; 1266 while (current != NULL) { 1267 next = current->_next; 1268 current->_next = NULL; 1269 delete(current); 1270 current = next; 1271 } 1272 table[i] = NULL; 1273 } 1274 } 1275 1276 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) { 1277 LVT_Hash* entry = table[index]; 1278 1279 /* 1280 * 3-tuple start_bci/length/slot has to be unique key, 1281 * so the following comparison seems to be redundant: 1282 * && elem->name_cp_index == entry->_elem->name_cp_index 1283 */ 1284 while (entry != NULL) { 1285 if (elem->start_bci == entry->_elem->start_bci 1286 && elem->length == entry->_elem->length 1287 && elem->name_cp_index == entry->_elem->name_cp_index 1288 && elem->slot == entry->_elem->slot 1289 ) { 1290 return entry; 1291 } 1292 entry = entry->_next; 1293 } 1294 return NULL; 1295 } 1296 1297 // Return false if the local variable is found in table. 1298 // Return true if no duplicate is found. 1299 // And local variable is added as a new entry in table. 1300 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) { 1301 // First lookup for duplicates 1302 int index = hash(elem); 1303 LVT_Hash* entry = LVT_lookup(elem, index, table); 1304 1305 if (entry != NULL) { 1306 return false; 1307 } 1308 // No duplicate is found, allocate a new entry and fill it. 1309 if ((entry = new LVT_Hash()) == NULL) { 1310 return false; 1311 } 1312 entry->_elem = elem; 1313 1314 // Insert into hash table 1315 entry->_next = table[index]; 1316 table[index] = entry; 1317 1318 return true; 1319 } 1320 1321 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1322 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1323 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1324 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1325 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1326 lvt->signature_cp_index = 0; 1327 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1328 } 1329 1330 // Function is used to parse both attributes: 1331 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1332 u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1333 u2 max_locals, 1334 u4 code_attribute_length, 1335 constantPoolHandle cp, 1336 u2* localvariable_table_length, 1337 bool isLVTT, 1338 TRAPS) { 1339 ClassFileStream* cfs = stream(); 1340 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1341 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1342 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1343 // Verify local variable table attribute has right length 1344 if (_need_verify) { 1345 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1346 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1347 } 1348 u2* localvariable_table_start = cfs->get_u2_buffer(); 1349 assert(localvariable_table_start != NULL, "null local variable table"); 1350 if (!_need_verify) { 1351 cfs->skip_u2_fast(size); 1352 } else { 1353 cfs->guarantee_more(size * 2, CHECK_NULL); 1354 for(int i = 0; i < (*localvariable_table_length); i++) { 1355 u2 start_pc = cfs->get_u2_fast(); 1356 u2 length = cfs->get_u2_fast(); 1357 u2 name_index = cfs->get_u2_fast(); 1358 u2 descriptor_index = cfs->get_u2_fast(); 1359 u2 index = cfs->get_u2_fast(); 1360 // Assign to a u4 to avoid overflow 1361 u4 end_pc = (u4)start_pc + (u4)length; 1362 1363 if (start_pc >= code_length) { 1364 classfile_parse_error( 1365 "Invalid start_pc %u in %s in class file %s", 1366 start_pc, tbl_name, CHECK_NULL); 1367 } 1368 if (end_pc > code_length) { 1369 classfile_parse_error( 1370 "Invalid length %u in %s in class file %s", 1371 length, tbl_name, CHECK_NULL); 1372 } 1373 int cp_size = cp->length(); 1374 guarantee_property( 1375 valid_cp_range(name_index, cp_size) && 1376 cp->tag_at(name_index).is_utf8(), 1377 "Name index %u in %s has bad constant type in class file %s", 1378 name_index, tbl_name, CHECK_NULL); 1379 guarantee_property( 1380 valid_cp_range(descriptor_index, cp_size) && 1381 cp->tag_at(descriptor_index).is_utf8(), 1382 "Signature index %u in %s has bad constant type in class file %s", 1383 descriptor_index, tbl_name, CHECK_NULL); 1384 1385 symbolHandle name(THREAD, cp->symbol_at(name_index)); 1386 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index)); 1387 verify_legal_field_name(name, CHECK_NULL); 1388 u2 extra_slot = 0; 1389 if (!isLVTT) { 1390 verify_legal_field_signature(name, sig, CHECK_NULL); 1391 1392 // 4894874: check special cases for double and long local variables 1393 if (sig() == vmSymbols::type_signature(T_DOUBLE) || 1394 sig() == vmSymbols::type_signature(T_LONG)) { 1395 extra_slot = 1; 1396 } 1397 } 1398 guarantee_property((index + extra_slot) < max_locals, 1399 "Invalid index %u in %s in class file %s", 1400 index, tbl_name, CHECK_NULL); 1401 } 1402 } 1403 return localvariable_table_start; 1404 } 1405 1406 1407 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1408 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) { 1409 ClassFileStream* cfs = stream(); 1410 u2 index = 0; // index in the array with long/double occupying two slots 1411 u4 i1 = *u1_index; 1412 u4 i2 = *u2_index + 1; 1413 for(int i = 0; i < array_length; i++) { 1414 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1415 index++; 1416 if (tag == ITEM_Long || tag == ITEM_Double) { 1417 index++; 1418 } else if (tag == ITEM_Object) { 1419 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1420 guarantee_property(valid_cp_range(class_index, cp->length()) && 1421 is_klass_reference(cp, class_index), 1422 "Bad class index %u in StackMap in class file %s", 1423 class_index, CHECK); 1424 } else if (tag == ITEM_Uninitialized) { 1425 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1426 guarantee_property( 1427 offset < code_length, 1428 "Bad uninitialized type offset %u in StackMap in class file %s", 1429 offset, CHECK); 1430 } else { 1431 guarantee_property( 1432 tag <= (u1)ITEM_Uninitialized, 1433 "Unknown variable type %u in StackMap in class file %s", 1434 tag, CHECK); 1435 } 1436 } 1437 u2_array[*u2_index] = index; 1438 *u1_index = i1; 1439 *u2_index = i2; 1440 } 1441 1442 typeArrayOop ClassFileParser::parse_stackmap_table( 1443 u4 code_attribute_length, TRAPS) { 1444 if (code_attribute_length == 0) 1445 return NULL; 1446 1447 ClassFileStream* cfs = stream(); 1448 u1* stackmap_table_start = cfs->get_u1_buffer(); 1449 assert(stackmap_table_start != NULL, "null stackmap table"); 1450 1451 // check code_attribute_length first 1452 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1453 1454 if (!_need_verify && !DumpSharedSpaces) { 1455 return NULL; 1456 } 1457 1458 typeArrayOop stackmap_data = 1459 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL); 1460 1461 stackmap_data->set_length(code_attribute_length); 1462 memcpy((void*)stackmap_data->byte_at_addr(0), 1463 (void*)stackmap_table_start, code_attribute_length); 1464 return stackmap_data; 1465 } 1466 1467 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1468 u4 method_attribute_length, 1469 constantPoolHandle cp, TRAPS) { 1470 ClassFileStream* cfs = stream(); 1471 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1472 *checked_exceptions_length = cfs->get_u2_fast(); 1473 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1474 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1475 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1476 if (!_need_verify) { 1477 cfs->skip_u2_fast(size); 1478 } else { 1479 // Verify each value in the checked exception table 1480 u2 checked_exception; 1481 u2 len = *checked_exceptions_length; 1482 cfs->guarantee_more(2 * len, CHECK_NULL); 1483 for (int i = 0; i < len; i++) { 1484 checked_exception = cfs->get_u2_fast(); 1485 check_property( 1486 valid_cp_range(checked_exception, cp->length()) && 1487 is_klass_reference(cp, checked_exception), 1488 "Exception name has bad type at constant pool %u in class file %s", 1489 checked_exception, CHECK_NULL); 1490 } 1491 } 1492 // check exceptions attribute length 1493 if (_need_verify) { 1494 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1495 sizeof(u2) * size), 1496 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1497 } 1498 return checked_exceptions_start; 1499 } 1500 1501 void ClassFileParser::throwIllegalSignature( 1502 const char* type, symbolHandle name, symbolHandle sig, TRAPS) { 1503 ResourceMark rm(THREAD); 1504 Exceptions::fthrow(THREAD_AND_LOCATION, 1505 vmSymbols::java_lang_ClassFormatError(), 1506 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1507 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1508 } 1509 1510 #define MAX_ARGS_SIZE 255 1511 #define MAX_CODE_SIZE 65535 1512 #define INITIAL_MAX_LVT_NUMBER 256 1513 1514 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1515 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the 1516 // methodOop to save footprint, so we only know the size of the resulting methodOop when the 1517 // entire method attribute is parsed. 1518 // 1519 // The promoted_flags parameter is used to pass relevant access_flags 1520 // from the method back up to the containing klass. These flag values 1521 // are added to klass's access_flags. 1522 1523 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface, 1524 AccessFlags *promoted_flags, 1525 typeArrayHandle* method_annotations, 1526 typeArrayHandle* method_parameter_annotations, 1527 typeArrayHandle* method_default_annotations, 1528 TRAPS) { 1529 ClassFileStream* cfs = stream(); 1530 methodHandle nullHandle; 1531 ResourceMark rm(THREAD); 1532 // Parse fixed parts 1533 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1534 1535 int flags = cfs->get_u2_fast(); 1536 u2 name_index = cfs->get_u2_fast(); 1537 int cp_size = cp->length(); 1538 check_property( 1539 valid_cp_range(name_index, cp_size) && 1540 cp->tag_at(name_index).is_utf8(), 1541 "Illegal constant pool index %u for method name in class file %s", 1542 name_index, CHECK_(nullHandle)); 1543 symbolHandle name(THREAD, cp->symbol_at(name_index)); 1544 verify_legal_method_name(name, CHECK_(nullHandle)); 1545 1546 u2 signature_index = cfs->get_u2_fast(); 1547 guarantee_property( 1548 valid_cp_range(signature_index, cp_size) && 1549 cp->tag_at(signature_index).is_utf8(), 1550 "Illegal constant pool index %u for method signature in class file %s", 1551 signature_index, CHECK_(nullHandle)); 1552 symbolHandle signature(THREAD, cp->symbol_at(signature_index)); 1553 1554 AccessFlags access_flags; 1555 if (name == vmSymbols::class_initializer_name()) { 1556 // We ignore the access flags for a class initializer. (JVM Spec. p. 116) 1557 flags = JVM_ACC_STATIC; 1558 } else { 1559 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 1560 } 1561 1562 int args_size = -1; // only used when _need_verify is true 1563 if (_need_verify) { 1564 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 1565 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 1566 if (args_size > MAX_ARGS_SIZE) { 1567 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 1568 } 1569 } 1570 1571 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 1572 1573 // Default values for code and exceptions attribute elements 1574 u2 max_stack = 0; 1575 u2 max_locals = 0; 1576 u4 code_length = 0; 1577 u1* code_start = 0; 1578 u2 exception_table_length = 0; 1579 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array()); 1580 u2 checked_exceptions_length = 0; 1581 u2* checked_exceptions_start = NULL; 1582 CompressedLineNumberWriteStream* linenumber_table = NULL; 1583 int linenumber_table_length = 0; 1584 int total_lvt_length = 0; 1585 u2 lvt_cnt = 0; 1586 u2 lvtt_cnt = 0; 1587 bool lvt_allocated = false; 1588 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 1589 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 1590 u2* localvariable_table_length; 1591 u2** localvariable_table_start; 1592 u2* localvariable_type_table_length; 1593 u2** localvariable_type_table_start; 1594 bool parsed_code_attribute = false; 1595 bool parsed_checked_exceptions_attribute = false; 1596 bool parsed_stackmap_attribute = false; 1597 // stackmap attribute - JDK1.5 1598 typeArrayHandle stackmap_data; 1599 u2 generic_signature_index = 0; 1600 u1* runtime_visible_annotations = NULL; 1601 int runtime_visible_annotations_length = 0; 1602 u1* runtime_invisible_annotations = NULL; 1603 int runtime_invisible_annotations_length = 0; 1604 u1* runtime_visible_parameter_annotations = NULL; 1605 int runtime_visible_parameter_annotations_length = 0; 1606 u1* runtime_invisible_parameter_annotations = NULL; 1607 int runtime_invisible_parameter_annotations_length = 0; 1608 u1* annotation_default = NULL; 1609 int annotation_default_length = 0; 1610 1611 // Parse code and exceptions attribute 1612 u2 method_attributes_count = cfs->get_u2_fast(); 1613 while (method_attributes_count--) { 1614 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 1615 u2 method_attribute_name_index = cfs->get_u2_fast(); 1616 u4 method_attribute_length = cfs->get_u4_fast(); 1617 check_property( 1618 valid_cp_range(method_attribute_name_index, cp_size) && 1619 cp->tag_at(method_attribute_name_index).is_utf8(), 1620 "Invalid method attribute name index %u in class file %s", 1621 method_attribute_name_index, CHECK_(nullHandle)); 1622 1623 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index); 1624 if (method_attribute_name == vmSymbols::tag_code()) { 1625 // Parse Code attribute 1626 if (_need_verify) { 1627 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(), 1628 "Code attribute in native or abstract methods in class file %s", 1629 CHECK_(nullHandle)); 1630 } 1631 if (parsed_code_attribute) { 1632 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 1633 } 1634 parsed_code_attribute = true; 1635 1636 // Stack size, locals size, and code size 1637 if (_major_version == 45 && _minor_version <= 2) { 1638 cfs->guarantee_more(4, CHECK_(nullHandle)); 1639 max_stack = cfs->get_u1_fast(); 1640 max_locals = cfs->get_u1_fast(); 1641 code_length = cfs->get_u2_fast(); 1642 } else { 1643 cfs->guarantee_more(8, CHECK_(nullHandle)); 1644 max_stack = cfs->get_u2_fast(); 1645 max_locals = cfs->get_u2_fast(); 1646 code_length = cfs->get_u4_fast(); 1647 } 1648 if (_need_verify) { 1649 guarantee_property(args_size <= max_locals, 1650 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 1651 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 1652 "Invalid method Code length %u in class file %s", 1653 code_length, CHECK_(nullHandle)); 1654 } 1655 // Code pointer 1656 code_start = cfs->get_u1_buffer(); 1657 assert(code_start != NULL, "null code start"); 1658 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 1659 cfs->skip_u1_fast(code_length); 1660 1661 // Exception handler table 1662 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 1663 exception_table_length = cfs->get_u2_fast(); 1664 if (exception_table_length > 0) { 1665 exception_handlers = 1666 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle)); 1667 } 1668 1669 // Parse additional attributes in code attribute 1670 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 1671 u2 code_attributes_count = cfs->get_u2_fast(); 1672 1673 unsigned int calculated_attribute_length = 0; 1674 1675 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 1676 calculated_attribute_length = 1677 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 1678 } else { 1679 // max_stack, locals and length are smaller in pre-version 45.2 classes 1680 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 1681 } 1682 calculated_attribute_length += 1683 code_length + 1684 sizeof(exception_table_length) + 1685 sizeof(code_attributes_count) + 1686 exception_table_length * 1687 ( sizeof(u2) + // start_pc 1688 sizeof(u2) + // end_pc 1689 sizeof(u2) + // handler_pc 1690 sizeof(u2) ); // catch_type_index 1691 1692 while (code_attributes_count--) { 1693 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 1694 u2 code_attribute_name_index = cfs->get_u2_fast(); 1695 u4 code_attribute_length = cfs->get_u4_fast(); 1696 calculated_attribute_length += code_attribute_length + 1697 sizeof(code_attribute_name_index) + 1698 sizeof(code_attribute_length); 1699 check_property(valid_cp_range(code_attribute_name_index, cp_size) && 1700 cp->tag_at(code_attribute_name_index).is_utf8(), 1701 "Invalid code attribute name index %u in class file %s", 1702 code_attribute_name_index, 1703 CHECK_(nullHandle)); 1704 if (LoadLineNumberTables && 1705 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 1706 // Parse and compress line number table 1707 parse_linenumber_table(code_attribute_length, code_length, 1708 &linenumber_table, CHECK_(nullHandle)); 1709 1710 } else if (LoadLocalVariableTables && 1711 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 1712 // Parse local variable table 1713 if (!lvt_allocated) { 1714 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1715 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1716 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1717 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1718 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1719 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1720 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1721 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1722 lvt_allocated = true; 1723 } 1724 if (lvt_cnt == max_lvt_cnt) { 1725 max_lvt_cnt <<= 1; 1726 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 1727 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 1728 } 1729 localvariable_table_start[lvt_cnt] = 1730 parse_localvariable_table(code_length, 1731 max_locals, 1732 code_attribute_length, 1733 cp, 1734 &localvariable_table_length[lvt_cnt], 1735 false, // is not LVTT 1736 CHECK_(nullHandle)); 1737 total_lvt_length += localvariable_table_length[lvt_cnt]; 1738 lvt_cnt++; 1739 } else if (LoadLocalVariableTypeTables && 1740 _major_version >= JAVA_1_5_VERSION && 1741 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 1742 if (!lvt_allocated) { 1743 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1744 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1745 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1746 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1747 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1748 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1749 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1750 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1751 lvt_allocated = true; 1752 } 1753 // Parse local variable type table 1754 if (lvtt_cnt == max_lvtt_cnt) { 1755 max_lvtt_cnt <<= 1; 1756 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 1757 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 1758 } 1759 localvariable_type_table_start[lvtt_cnt] = 1760 parse_localvariable_table(code_length, 1761 max_locals, 1762 code_attribute_length, 1763 cp, 1764 &localvariable_type_table_length[lvtt_cnt], 1765 true, // is LVTT 1766 CHECK_(nullHandle)); 1767 lvtt_cnt++; 1768 } else if (UseSplitVerifier && 1769 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 1770 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 1771 // Stack map is only needed by the new verifier in JDK1.5. 1772 if (parsed_stackmap_attribute) { 1773 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 1774 } 1775 typeArrayOop sm = 1776 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 1777 stackmap_data = typeArrayHandle(THREAD, sm); 1778 parsed_stackmap_attribute = true; 1779 } else { 1780 // Skip unknown attributes 1781 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 1782 } 1783 } 1784 // check method attribute length 1785 if (_need_verify) { 1786 guarantee_property(method_attribute_length == calculated_attribute_length, 1787 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 1788 } 1789 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 1790 // Parse Exceptions attribute 1791 if (parsed_checked_exceptions_attribute) { 1792 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 1793 } 1794 parsed_checked_exceptions_attribute = true; 1795 checked_exceptions_start = 1796 parse_checked_exceptions(&checked_exceptions_length, 1797 method_attribute_length, 1798 cp, CHECK_(nullHandle)); 1799 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 1800 if (method_attribute_length != 0) { 1801 classfile_parse_error( 1802 "Invalid Synthetic method attribute length %u in class file %s", 1803 method_attribute_length, CHECK_(nullHandle)); 1804 } 1805 // Should we check that there hasn't already been a synthetic attribute? 1806 access_flags.set_is_synthetic(); 1807 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1808 if (method_attribute_length != 0) { 1809 classfile_parse_error( 1810 "Invalid Deprecated method attribute length %u in class file %s", 1811 method_attribute_length, CHECK_(nullHandle)); 1812 } 1813 } else if (_major_version >= JAVA_1_5_VERSION) { 1814 if (method_attribute_name == vmSymbols::tag_signature()) { 1815 if (method_attribute_length != 2) { 1816 classfile_parse_error( 1817 "Invalid Signature attribute length %u in class file %s", 1818 method_attribute_length, CHECK_(nullHandle)); 1819 } 1820 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index 1821 generic_signature_index = cfs->get_u2_fast(); 1822 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1823 runtime_visible_annotations_length = method_attribute_length; 1824 runtime_visible_annotations = cfs->get_u1_buffer(); 1825 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1826 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 1827 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1828 runtime_invisible_annotations_length = method_attribute_length; 1829 runtime_invisible_annotations = cfs->get_u1_buffer(); 1830 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1831 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle)); 1832 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 1833 runtime_visible_parameter_annotations_length = method_attribute_length; 1834 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 1835 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 1836 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 1837 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 1838 runtime_invisible_parameter_annotations_length = method_attribute_length; 1839 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 1840 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 1841 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle)); 1842 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 1843 annotation_default_length = method_attribute_length; 1844 annotation_default = cfs->get_u1_buffer(); 1845 assert(annotation_default != NULL, "null annotation default"); 1846 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 1847 } else { 1848 // Skip unknown attributes 1849 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 1850 } 1851 } else { 1852 // Skip unknown attributes 1853 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 1854 } 1855 } 1856 1857 if (linenumber_table != NULL) { 1858 linenumber_table->write_terminator(); 1859 linenumber_table_length = linenumber_table->position(); 1860 } 1861 1862 // Make sure there's at least one Code attribute in non-native/non-abstract method 1863 if (_need_verify) { 1864 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 1865 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 1866 } 1867 1868 // All sizing information for a methodOop is finally available, now create it 1869 methodOop m_oop = oopFactory::new_method( 1870 code_length, access_flags, linenumber_table_length, 1871 total_lvt_length, checked_exceptions_length, 1872 methodOopDesc::IsSafeConc, CHECK_(nullHandle)); 1873 methodHandle m (THREAD, m_oop); 1874 1875 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize); 1876 1877 // Fill in information from fixed part (access_flags already set) 1878 m->set_constants(cp()); 1879 m->set_name_index(name_index); 1880 m->set_signature_index(signature_index); 1881 m->set_generic_signature_index(generic_signature_index); 1882 #ifdef CC_INTERP 1883 // hmm is there a gc issue here?? 1884 ResultTypeFinder rtf(cp->symbol_at(signature_index)); 1885 m->set_result_index(rtf.type()); 1886 #endif 1887 1888 if (args_size >= 0) { 1889 m->set_size_of_parameters(args_size); 1890 } else { 1891 m->compute_size_of_parameters(THREAD); 1892 } 1893 #ifdef ASSERT 1894 if (args_size >= 0) { 1895 m->compute_size_of_parameters(THREAD); 1896 assert(args_size == m->size_of_parameters(), ""); 1897 } 1898 #endif 1899 1900 // Fill in code attribute information 1901 m->set_max_stack(max_stack); 1902 m->set_max_locals(max_locals); 1903 m->constMethod()->set_stackmap_data(stackmap_data()); 1904 1905 /** 1906 * The exception_table field is the flag used to indicate 1907 * that the methodOop and it's associated constMethodOop are partially 1908 * initialized and thus are exempt from pre/post GC verification. Once 1909 * the field is set, the oops are considered fully initialized so make 1910 * sure that the oops can pass verification when this field is set. 1911 */ 1912 m->set_exception_table(exception_handlers()); 1913 1914 // Copy byte codes 1915 m->set_code(code_start); 1916 1917 // Copy line number table 1918 if (linenumber_table != NULL) { 1919 memcpy(m->compressed_linenumber_table(), 1920 linenumber_table->buffer(), linenumber_table_length); 1921 } 1922 1923 // Copy checked exceptions 1924 if (checked_exceptions_length > 0) { 1925 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 1926 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 1927 } 1928 1929 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1930 * 1931 * Rules for LVT's and LVTT's are: 1932 * - There can be any number of LVT's and LVTT's. 1933 * - If there are n LVT's, it is the same as if there was just 1934 * one LVT containing all the entries from the n LVT's. 1935 * - There may be no more than one LVT entry per local variable. 1936 * Two LVT entries are 'equal' if these fields are the same: 1937 * start_pc, length, name, slot 1938 * - There may be no more than one LVTT entry per each LVT entry. 1939 * Each LVTT entry has to match some LVT entry. 1940 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1941 */ 1942 if (total_lvt_length > 0) { 1943 int tbl_no, idx; 1944 1945 promoted_flags->set_has_localvariable_table(); 1946 1947 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE); 1948 initialize_hashtable(lvt_Hash); 1949 1950 // To fill LocalVariableTable in 1951 Classfile_LVT_Element* cf_lvt; 1952 LocalVariableTableElement* lvt = m->localvariable_table_start(); 1953 1954 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 1955 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 1956 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 1957 copy_lvt_element(&cf_lvt[idx], lvt); 1958 // If no duplicates, add LVT elem in hashtable lvt_Hash. 1959 if (LVT_put_after_lookup(lvt, lvt_Hash) == false 1960 && _need_verify 1961 && _major_version >= JAVA_1_5_VERSION ) { 1962 clear_hashtable(lvt_Hash); 1963 classfile_parse_error("Duplicated LocalVariableTable attribute " 1964 "entry for '%s' in class file %s", 1965 cp->symbol_at(lvt->name_cp_index)->as_utf8(), 1966 CHECK_(nullHandle)); 1967 } 1968 } 1969 } 1970 1971 // To merge LocalVariableTable and LocalVariableTypeTable 1972 Classfile_LVT_Element* cf_lvtt; 1973 LocalVariableTableElement lvtt_elem; 1974 1975 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 1976 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 1977 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 1978 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 1979 int index = hash(&lvtt_elem); 1980 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash); 1981 if (entry == NULL) { 1982 if (_need_verify) { 1983 clear_hashtable(lvt_Hash); 1984 classfile_parse_error("LVTT entry for '%s' in class file %s " 1985 "does not match any LVT entry", 1986 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1987 CHECK_(nullHandle)); 1988 } 1989 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) { 1990 clear_hashtable(lvt_Hash); 1991 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1992 "entry for '%s' in class file %s", 1993 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1994 CHECK_(nullHandle)); 1995 } else { 1996 // to add generic signatures into LocalVariableTable 1997 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; 1998 } 1999 } 2000 } 2001 clear_hashtable(lvt_Hash); 2002 } 2003 2004 *method_annotations = assemble_annotations(runtime_visible_annotations, 2005 runtime_visible_annotations_length, 2006 runtime_invisible_annotations, 2007 runtime_invisible_annotations_length, 2008 CHECK_(nullHandle)); 2009 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations, 2010 runtime_visible_parameter_annotations_length, 2011 runtime_invisible_parameter_annotations, 2012 runtime_invisible_parameter_annotations_length, 2013 CHECK_(nullHandle)); 2014 *method_default_annotations = assemble_annotations(annotation_default, 2015 annotation_default_length, 2016 NULL, 2017 0, 2018 CHECK_(nullHandle)); 2019 2020 if (name() == vmSymbols::finalize_method_name() && 2021 signature() == vmSymbols::void_method_signature()) { 2022 if (m->is_empty_method()) { 2023 _has_empty_finalizer = true; 2024 } else { 2025 _has_finalizer = true; 2026 } 2027 } 2028 if (name() == vmSymbols::object_initializer_name() && 2029 signature() == vmSymbols::void_method_signature() && 2030 m->is_vanilla_constructor()) { 2031 _has_vanilla_constructor = true; 2032 } 2033 2034 if (EnableMethodHandles && (m->is_method_handle_invoke() || 2035 m->is_method_handle_adapter())) { 2036 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(), 2037 "Method handle invokers must be defined internally to the VM", nullHandle); 2038 } 2039 2040 return m; 2041 } 2042 2043 2044 // The promoted_flags parameter is used to pass relevant access_flags 2045 // from the methods back up to the containing klass. These flag values 2046 // are added to klass's access_flags. 2047 2048 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface, 2049 AccessFlags* promoted_flags, 2050 bool* has_final_method, 2051 objArrayOop* methods_annotations_oop, 2052 objArrayOop* methods_parameter_annotations_oop, 2053 objArrayOop* methods_default_annotations_oop, 2054 TRAPS) { 2055 ClassFileStream* cfs = stream(); 2056 objArrayHandle nullHandle; 2057 typeArrayHandle method_annotations; 2058 typeArrayHandle method_parameter_annotations; 2059 typeArrayHandle method_default_annotations; 2060 cfs->guarantee_more(2, CHECK_(nullHandle)); // length 2061 u2 length = cfs->get_u2_fast(); 2062 if (length == 0) { 2063 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 2064 } else { 2065 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 2066 objArrayHandle methods(THREAD, m); 2067 HandleMark hm(THREAD); 2068 objArrayHandle methods_annotations; 2069 objArrayHandle methods_parameter_annotations; 2070 objArrayHandle methods_default_annotations; 2071 for (int index = 0; index < length; index++) { 2072 methodHandle method = parse_method(cp, is_interface, 2073 promoted_flags, 2074 &method_annotations, 2075 &method_parameter_annotations, 2076 &method_default_annotations, 2077 CHECK_(nullHandle)); 2078 if (method->is_final()) { 2079 *has_final_method = true; 2080 } 2081 methods->obj_at_put(index, method()); 2082 if (method_annotations.not_null()) { 2083 if (methods_annotations.is_null()) { 2084 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 2085 methods_annotations = objArrayHandle(THREAD, md); 2086 } 2087 methods_annotations->obj_at_put(index, method_annotations()); 2088 } 2089 if (method_parameter_annotations.not_null()) { 2090 if (methods_parameter_annotations.is_null()) { 2091 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 2092 methods_parameter_annotations = objArrayHandle(THREAD, md); 2093 } 2094 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations()); 2095 } 2096 if (method_default_annotations.not_null()) { 2097 if (methods_default_annotations.is_null()) { 2098 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 2099 methods_default_annotations = objArrayHandle(THREAD, md); 2100 } 2101 methods_default_annotations->obj_at_put(index, method_default_annotations()); 2102 } 2103 } 2104 if (_need_verify && length > 1) { 2105 // Check duplicated methods 2106 ResourceMark rm(THREAD); 2107 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2108 THREAD, NameSigHash*, HASH_ROW_SIZE); 2109 initialize_hashtable(names_and_sigs); 2110 bool dup = false; 2111 { 2112 debug_only(No_Safepoint_Verifier nsv;) 2113 for (int i = 0; i < length; i++) { 2114 methodOop m = (methodOop)methods->obj_at(i); 2115 // If no duplicates, add name/signature in hashtable names_and_sigs. 2116 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 2117 dup = true; 2118 break; 2119 } 2120 } 2121 } 2122 if (dup) { 2123 classfile_parse_error("Duplicate method name&signature in class file %s", 2124 CHECK_(nullHandle)); 2125 } 2126 } 2127 2128 *methods_annotations_oop = methods_annotations(); 2129 *methods_parameter_annotations_oop = methods_parameter_annotations(); 2130 *methods_default_annotations_oop = methods_default_annotations(); 2131 2132 return methods; 2133 } 2134 } 2135 2136 2137 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods, 2138 objArrayHandle methods_annotations, 2139 objArrayHandle methods_parameter_annotations, 2140 objArrayHandle methods_default_annotations, 2141 TRAPS) { 2142 typeArrayHandle nullHandle; 2143 int length = methods()->length(); 2144 // If JVMTI original method ordering is enabled we have to 2145 // remember the original class file ordering. 2146 // We temporarily use the vtable_index field in the methodOop to store the 2147 // class file index, so we can read in after calling qsort. 2148 if (JvmtiExport::can_maintain_original_method_order()) { 2149 for (int index = 0; index < length; index++) { 2150 methodOop m = methodOop(methods->obj_at(index)); 2151 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2152 m->set_vtable_index(index); 2153 } 2154 } 2155 // Sort method array by ascending method name (for faster lookups & vtable construction) 2156 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare 2157 methodOopDesc::sort_methods(methods(), 2158 methods_annotations(), 2159 methods_parameter_annotations(), 2160 methods_default_annotations()); 2161 2162 // If JVMTI original method ordering is enabled construct int array remembering the original ordering 2163 if (JvmtiExport::can_maintain_original_method_order()) { 2164 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle)); 2165 typeArrayHandle method_ordering(THREAD, new_ordering); 2166 for (int index = 0; index < length; index++) { 2167 methodOop m = methodOop(methods->obj_at(index)); 2168 int old_index = m->vtable_index(); 2169 assert(old_index >= 0 && old_index < length, "invalid method index"); 2170 method_ordering->int_at_put(index, old_index); 2171 m->set_vtable_index(methodOopDesc::invalid_vtable_index); 2172 } 2173 return method_ordering; 2174 } else { 2175 return typeArrayHandle(THREAD, Universe::the_empty_int_array()); 2176 } 2177 } 2178 2179 2180 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2181 ClassFileStream* cfs = stream(); 2182 cfs->guarantee_more(2, CHECK); // sourcefile_index 2183 u2 sourcefile_index = cfs->get_u2_fast(); 2184 check_property( 2185 valid_cp_range(sourcefile_index, cp->length()) && 2186 cp->tag_at(sourcefile_index).is_utf8(), 2187 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2188 sourcefile_index, CHECK); 2189 k->set_source_file_name(cp->symbol_at(sourcefile_index)); 2190 } 2191 2192 2193 2194 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp, 2195 instanceKlassHandle k, 2196 int length, TRAPS) { 2197 ClassFileStream* cfs = stream(); 2198 u1* sde_buffer = cfs->get_u1_buffer(); 2199 assert(sde_buffer != NULL, "null sde buffer"); 2200 2201 // Don't bother storing it if there is no way to retrieve it 2202 if (JvmtiExport::can_get_source_debug_extension()) { 2203 // Optimistically assume that only 1 byte UTF format is used 2204 // (common case) 2205 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer, 2206 length, CHECK); 2207 k->set_source_debug_extension(sde_symbol); 2208 } 2209 // Got utf8 string, set stream position forward 2210 cfs->skip_u1(length, CHECK); 2211 } 2212 2213 2214 // Inner classes can be static, private or protected (classic VM does this) 2215 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2216 2217 // Return number of classes in the inner classes attribute table 2218 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2219 ClassFileStream* cfs = stream(); 2220 cfs->guarantee_more(2, CHECK_0); // length 2221 u2 length = cfs->get_u2_fast(); 2222 2223 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags] 2224 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0); 2225 typeArrayHandle inner_classes(THREAD, ic); 2226 int index = 0; 2227 int cp_size = cp->length(); 2228 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2229 for (int n = 0; n < length; n++) { 2230 // Inner class index 2231 u2 inner_class_info_index = cfs->get_u2_fast(); 2232 check_property( 2233 inner_class_info_index == 0 || 2234 (valid_cp_range(inner_class_info_index, cp_size) && 2235 is_klass_reference(cp, inner_class_info_index)), 2236 "inner_class_info_index %u has bad constant type in class file %s", 2237 inner_class_info_index, CHECK_0); 2238 // Outer class index 2239 u2 outer_class_info_index = cfs->get_u2_fast(); 2240 check_property( 2241 outer_class_info_index == 0 || 2242 (valid_cp_range(outer_class_info_index, cp_size) && 2243 is_klass_reference(cp, outer_class_info_index)), 2244 "outer_class_info_index %u has bad constant type in class file %s", 2245 outer_class_info_index, CHECK_0); 2246 // Inner class name 2247 u2 inner_name_index = cfs->get_u2_fast(); 2248 check_property( 2249 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) && 2250 cp->tag_at(inner_name_index).is_utf8()), 2251 "inner_name_index %u has bad constant type in class file %s", 2252 inner_name_index, CHECK_0); 2253 if (_need_verify) { 2254 guarantee_property(inner_class_info_index != outer_class_info_index, 2255 "Class is both outer and inner class in class file %s", CHECK_0); 2256 } 2257 // Access flags 2258 AccessFlags inner_access_flags; 2259 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2260 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2261 // Set abstract bit for old class files for backward compatibility 2262 flags |= JVM_ACC_ABSTRACT; 2263 } 2264 verify_legal_class_modifiers(flags, CHECK_0); 2265 inner_access_flags.set_flags(flags); 2266 2267 inner_classes->short_at_put(index++, inner_class_info_index); 2268 inner_classes->short_at_put(index++, outer_class_info_index); 2269 inner_classes->short_at_put(index++, inner_name_index); 2270 inner_classes->short_at_put(index++, inner_access_flags.as_short()); 2271 } 2272 2273 // 4347400: make sure there's no duplicate entry in the classes array 2274 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2275 for(int i = 0; i < inner_classes->length(); i += 4) { 2276 for(int j = i + 4; j < inner_classes->length(); j += 4) { 2277 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) || 2278 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) || 2279 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) || 2280 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)), 2281 "Duplicate entry in InnerClasses in class file %s", 2282 CHECK_0); 2283 } 2284 } 2285 } 2286 2287 // Update instanceKlass with inner class info. 2288 k->set_inner_classes(inner_classes()); 2289 return length; 2290 } 2291 2292 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2293 k->set_is_synthetic(); 2294 } 2295 2296 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2297 ClassFileStream* cfs = stream(); 2298 u2 signature_index = cfs->get_u2(CHECK); 2299 check_property( 2300 valid_cp_range(signature_index, cp->length()) && 2301 cp->tag_at(signature_index).is_utf8(), 2302 "Invalid constant pool index %u in Signature attribute in class file %s", 2303 signature_index, CHECK); 2304 k->set_generic_signature(cp->symbol_at(signature_index)); 2305 } 2306 2307 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2308 ClassFileStream* cfs = stream(); 2309 // Set inner classes attribute to default sentinel 2310 k->set_inner_classes(Universe::the_empty_short_array()); 2311 cfs->guarantee_more(2, CHECK); // attributes_count 2312 u2 attributes_count = cfs->get_u2_fast(); 2313 bool parsed_sourcefile_attribute = false; 2314 bool parsed_innerclasses_attribute = false; 2315 bool parsed_enclosingmethod_attribute = false; 2316 u1* runtime_visible_annotations = NULL; 2317 int runtime_visible_annotations_length = 0; 2318 u1* runtime_invisible_annotations = NULL; 2319 int runtime_invisible_annotations_length = 0; 2320 // Iterate over attributes 2321 while (attributes_count--) { 2322 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2323 u2 attribute_name_index = cfs->get_u2_fast(); 2324 u4 attribute_length = cfs->get_u4_fast(); 2325 check_property( 2326 valid_cp_range(attribute_name_index, cp->length()) && 2327 cp->tag_at(attribute_name_index).is_utf8(), 2328 "Attribute name has bad constant pool index %u in class file %s", 2329 attribute_name_index, CHECK); 2330 symbolOop tag = cp->symbol_at(attribute_name_index); 2331 if (tag == vmSymbols::tag_source_file()) { 2332 // Check for SourceFile tag 2333 if (_need_verify) { 2334 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2335 } 2336 if (parsed_sourcefile_attribute) { 2337 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2338 } else { 2339 parsed_sourcefile_attribute = true; 2340 } 2341 parse_classfile_sourcefile_attribute(cp, k, CHECK); 2342 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2343 // Check for SourceDebugExtension tag 2344 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK); 2345 } else if (tag == vmSymbols::tag_inner_classes()) { 2346 // Check for InnerClasses tag 2347 if (parsed_innerclasses_attribute) { 2348 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2349 } else { 2350 parsed_innerclasses_attribute = true; 2351 } 2352 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK); 2353 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2354 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 2355 "Wrong InnerClasses attribute length in class file %s", CHECK); 2356 } 2357 } else if (tag == vmSymbols::tag_synthetic()) { 2358 // Check for Synthetic tag 2359 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2360 if (attribute_length != 0) { 2361 classfile_parse_error( 2362 "Invalid Synthetic classfile attribute length %u in class file %s", 2363 attribute_length, CHECK); 2364 } 2365 parse_classfile_synthetic_attribute(cp, k, CHECK); 2366 } else if (tag == vmSymbols::tag_deprecated()) { 2367 // Check for Deprecatd tag - 4276120 2368 if (attribute_length != 0) { 2369 classfile_parse_error( 2370 "Invalid Deprecated classfile attribute length %u in class file %s", 2371 attribute_length, CHECK); 2372 } 2373 } else if (_major_version >= JAVA_1_5_VERSION) { 2374 if (tag == vmSymbols::tag_signature()) { 2375 if (attribute_length != 2) { 2376 classfile_parse_error( 2377 "Wrong Signature attribute length %u in class file %s", 2378 attribute_length, CHECK); 2379 } 2380 parse_classfile_signature_attribute(cp, k, CHECK); 2381 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2382 runtime_visible_annotations_length = attribute_length; 2383 runtime_visible_annotations = cfs->get_u1_buffer(); 2384 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2385 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2386 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) { 2387 runtime_invisible_annotations_length = attribute_length; 2388 runtime_invisible_annotations = cfs->get_u1_buffer(); 2389 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2390 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 2391 } else if (tag == vmSymbols::tag_enclosing_method()) { 2392 if (parsed_enclosingmethod_attribute) { 2393 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 2394 } else { 2395 parsed_enclosingmethod_attribute = true; 2396 } 2397 cfs->guarantee_more(4, CHECK); // class_index, method_index 2398 u2 class_index = cfs->get_u2_fast(); 2399 u2 method_index = cfs->get_u2_fast(); 2400 if (class_index == 0) { 2401 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 2402 } 2403 // Validate the constant pool indices and types 2404 if (!cp->is_within_bounds(class_index) || 2405 !is_klass_reference(cp, class_index)) { 2406 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 2407 } 2408 if (method_index != 0 && 2409 (!cp->is_within_bounds(method_index) || 2410 !cp->tag_at(method_index).is_name_and_type())) { 2411 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 2412 } 2413 k->set_enclosing_method_indices(class_index, method_index); 2414 } else { 2415 // Unknown attribute 2416 cfs->skip_u1(attribute_length, CHECK); 2417 } 2418 } else { 2419 // Unknown attribute 2420 cfs->skip_u1(attribute_length, CHECK); 2421 } 2422 } 2423 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations, 2424 runtime_visible_annotations_length, 2425 runtime_invisible_annotations, 2426 runtime_invisible_annotations_length, 2427 CHECK); 2428 k->set_class_annotations(annotations()); 2429 } 2430 2431 2432 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 2433 int runtime_visible_annotations_length, 2434 u1* runtime_invisible_annotations, 2435 int runtime_invisible_annotations_length, TRAPS) { 2436 typeArrayHandle annotations; 2437 if (runtime_visible_annotations != NULL || 2438 runtime_invisible_annotations != NULL) { 2439 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length + 2440 runtime_invisible_annotations_length, CHECK_(annotations)); 2441 annotations = typeArrayHandle(THREAD, anno); 2442 if (runtime_visible_annotations != NULL) { 2443 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length); 2444 } 2445 if (runtime_invisible_annotations != NULL) { 2446 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length); 2447 } 2448 } 2449 return annotations; 2450 } 2451 2452 2453 static void initialize_static_field(fieldDescriptor* fd, TRAPS) { 2454 KlassHandle h_k (THREAD, fd->field_holder()); 2455 assert(h_k.not_null() && fd->is_static(), "just checking"); 2456 if (fd->has_initial_value()) { 2457 BasicType t = fd->field_type(); 2458 switch (t) { 2459 case T_BYTE: 2460 h_k()->byte_field_put(fd->offset(), fd->int_initial_value()); 2461 break; 2462 case T_BOOLEAN: 2463 h_k()->bool_field_put(fd->offset(), fd->int_initial_value()); 2464 break; 2465 case T_CHAR: 2466 h_k()->char_field_put(fd->offset(), fd->int_initial_value()); 2467 break; 2468 case T_SHORT: 2469 h_k()->short_field_put(fd->offset(), fd->int_initial_value()); 2470 break; 2471 case T_INT: 2472 h_k()->int_field_put(fd->offset(), fd->int_initial_value()); 2473 break; 2474 case T_FLOAT: 2475 h_k()->float_field_put(fd->offset(), fd->float_initial_value()); 2476 break; 2477 case T_DOUBLE: 2478 h_k()->double_field_put(fd->offset(), fd->double_initial_value()); 2479 break; 2480 case T_LONG: 2481 h_k()->long_field_put(fd->offset(), fd->long_initial_value()); 2482 break; 2483 case T_OBJECT: 2484 { 2485 #ifdef ASSERT 2486 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK); 2487 assert(fd->signature() == sym, "just checking"); 2488 #endif 2489 oop string = fd->string_initial_value(CHECK); 2490 h_k()->obj_field_put(fd->offset(), string); 2491 } 2492 break; 2493 default: 2494 THROW_MSG(vmSymbols::java_lang_ClassFormatError(), 2495 "Illegal ConstantValue attribute in class file"); 2496 } 2497 } 2498 } 2499 2500 2501 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr, 2502 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) { 2503 // This code is for compatibility with earlier jdk's that do not 2504 // have the "discovered" field in java.lang.ref.Reference. For 1.5 2505 // the check for the "discovered" field should issue a warning if 2506 // the field is not found. For 1.6 this code should be issue a 2507 // fatal error if the "discovered" field is not found. 2508 // 2509 // Increment fac.nonstatic_oop_count so that the start of the 2510 // next type of non-static oops leaves room for the fake oop. 2511 // Do not increment next_nonstatic_oop_offset so that the 2512 // fake oop is place after the java.lang.ref.Reference oop 2513 // fields. 2514 // 2515 // Check the fields in java.lang.ref.Reference for the "discovered" 2516 // field. If it is not present, artifically create a field for it. 2517 // This allows this VM to run on early JDK where the field is not 2518 // present. 2519 2520 // 2521 // Increment fac.nonstatic_oop_count so that the start of the 2522 // next type of non-static oops leaves room for the fake oop. 2523 // Do not increment next_nonstatic_oop_offset so that the 2524 // fake oop is place after the java.lang.ref.Reference oop 2525 // fields. 2526 // 2527 // Check the fields in java.lang.ref.Reference for the "discovered" 2528 // field. If it is not present, artifically create a field for it. 2529 // This allows this VM to run on early JDK where the field is not 2530 // present. 2531 int reference_sig_index = 0; 2532 int reference_name_index = 0; 2533 int reference_index = 0; 2534 int extra = java_lang_ref_Reference::number_of_fake_oop_fields; 2535 const int n = (*fields_ptr)()->length(); 2536 for (int i = 0; i < n; i += instanceKlass::next_offset ) { 2537 int name_index = 2538 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset); 2539 int sig_index = 2540 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset); 2541 symbolOop f_name = cp->symbol_at(name_index); 2542 symbolOop f_sig = cp->symbol_at(sig_index); 2543 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) { 2544 // Save the index for reference signature for later use. 2545 // The fake discovered field does not entries in the 2546 // constant pool so the index for its signature cannot 2547 // be extracted from the constant pool. It will need 2548 // later, however. It's signature is vmSymbols::reference_signature() 2549 // so same an index for that signature. 2550 reference_sig_index = sig_index; 2551 reference_name_index = name_index; 2552 reference_index = i; 2553 } 2554 if (f_name == vmSymbols::reference_discovered_name() && 2555 f_sig == vmSymbols::reference_signature()) { 2556 // The values below are fake but will force extra 2557 // non-static oop fields and a corresponding non-static 2558 // oop map block to be allocated. 2559 extra = 0; 2560 break; 2561 } 2562 } 2563 if (extra != 0) { 2564 fac_ptr->nonstatic_oop_count += extra; 2565 // Add the additional entry to "fields" so that the klass 2566 // contains the "discoverd" field and the field will be initialized 2567 // in instances of the object. 2568 int fields_with_fix_length = (*fields_ptr)()->length() + 2569 instanceKlass::next_offset; 2570 typeArrayOop ff = oopFactory::new_permanent_shortArray( 2571 fields_with_fix_length, CHECK); 2572 typeArrayHandle fields_with_fix(THREAD, ff); 2573 2574 // Take everything from the original but the length. 2575 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) { 2576 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx)); 2577 } 2578 2579 // Add the fake field at the end. 2580 int i = (*fields_ptr)->length(); 2581 // There is no name index for the fake "discovered" field nor 2582 // signature but a signature is needed so that the field will 2583 // be properly initialized. Use one found for 2584 // one of the other reference fields. Be sure the index for the 2585 // name is 0. In fieldDescriptor::initialize() the index of the 2586 // name is checked. That check is by passed for the last nonstatic 2587 // oop field in a java.lang.ref.Reference which is assumed to be 2588 // this artificial "discovered" field. An assertion checks that 2589 // the name index is 0. 2590 assert(reference_index != 0, "Missing signature for reference"); 2591 2592 int j; 2593 for (j = 0; j < instanceKlass::next_offset; j++) { 2594 fields_with_fix->ushort_at_put(i + j, 2595 (*fields_ptr)->ushort_at(reference_index +j)); 2596 } 2597 // Clear the public access flag and set the private access flag. 2598 short flags; 2599 flags = 2600 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset); 2601 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set"); 2602 flags = flags & (~JVM_ACC_PUBLIC); 2603 flags = flags | JVM_ACC_PRIVATE; 2604 AccessFlags access_flags; 2605 access_flags.set_flags(flags); 2606 assert(!access_flags.is_public(), "Failed to clear public flag"); 2607 assert(access_flags.is_private(), "Failed to set private flag"); 2608 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset, 2609 flags); 2610 2611 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset) 2612 == reference_name_index, "The fake reference name is incorrect"); 2613 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset) 2614 == reference_sig_index, "The fake reference signature is incorrect"); 2615 // The type of the field is stored in the low_offset entry during 2616 // parsing. 2617 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) == 2618 NONSTATIC_OOP, "The fake reference type is incorrect"); 2619 2620 // "fields" is allocated in the permanent generation. Disgard 2621 // it and let it be collected. 2622 (*fields_ptr) = fields_with_fix; 2623 } 2624 return; 2625 } 2626 2627 2628 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr, 2629 FieldAllocationCount *fac_ptr, TRAPS) { 2630 // Add fake fields for java.lang.Class instances 2631 // 2632 // This is not particularly nice. We should consider adding a 2633 // private transient object field at the Java level to 2634 // java.lang.Class. Alternatively we could add a subclass of 2635 // instanceKlass which provides an accessor and size computer for 2636 // this field, but that appears to be more code than this hack. 2637 // 2638 // NOTE that we wedge these in at the beginning rather than the 2639 // end of the object because the Class layout changed between JDK 2640 // 1.3 and JDK 1.4 with the new reflection implementation; some 2641 // nonstatic oop fields were added at the Java level. The offsets 2642 // of these fake fields can't change between these two JDK 2643 // versions because when the offsets are computed at bootstrap 2644 // time we don't know yet which version of the JDK we're running in. 2645 2646 // The values below are fake but will force two non-static oop fields and 2647 // a corresponding non-static oop map block to be allocated. 2648 const int extra = java_lang_Class::number_of_fake_oop_fields; 2649 fac_ptr->nonstatic_oop_count += extra; 2650 } 2651 2652 2653 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) { 2654 // Cause the extra fake fields in java.lang.Class to show up before 2655 // the Java fields for layout compatibility between 1.3 and 1.4 2656 // Incrementing next_nonstatic_oop_offset here advances the 2657 // location where the real java fields are placed. 2658 const int extra = java_lang_Class::number_of_fake_oop_fields; 2659 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize); 2660 } 2661 2662 2663 // Force MethodHandle.vmentry to be an unmanaged pointer. 2664 // There is no way for a classfile to express this, so we must help it. 2665 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp, 2666 typeArrayHandle* fields_ptr, 2667 FieldAllocationCount *fac_ptr, 2668 TRAPS) { 2669 // Add fake fields for java.dyn.MethodHandle instances 2670 // 2671 // This is not particularly nice, but since there is no way to express 2672 // a native wordSize field in Java, we must do it at this level. 2673 2674 if (!EnableMethodHandles) return; 2675 2676 int word_sig_index = 0; 2677 const int cp_size = cp->length(); 2678 for (int index = 1; index < cp_size; index++) { 2679 if (cp->tag_at(index).is_utf8() && 2680 cp->symbol_at(index) == vmSymbols::machine_word_signature()) { 2681 word_sig_index = index; 2682 break; 2683 } 2684 } 2685 2686 if (word_sig_index == 0) 2687 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), 2688 "missing I or J signature (for vmentry) in java.dyn.MethodHandle"); 2689 2690 bool found_vmentry = false; 2691 2692 const int n = (*fields_ptr)()->length(); 2693 for (int i = 0; i < n; i += instanceKlass::next_offset) { 2694 int name_index = (*fields_ptr)->ushort_at(i + instanceKlass::name_index_offset); 2695 int sig_index = (*fields_ptr)->ushort_at(i + instanceKlass::signature_index_offset); 2696 int acc_flags = (*fields_ptr)->ushort_at(i + instanceKlass::access_flags_offset); 2697 symbolOop f_name = cp->symbol_at(name_index); 2698 symbolOop f_sig = cp->symbol_at(sig_index); 2699 if (f_sig == vmSymbols::byte_signature() && 2700 f_name == vmSymbols::vmentry_name() && 2701 (acc_flags & JVM_ACC_STATIC) == 0) { 2702 // Adjust the field type from byte to an unmanaged pointer. 2703 assert(fac_ptr->nonstatic_byte_count > 0, ""); 2704 fac_ptr->nonstatic_byte_count -= 1; 2705 (*fields_ptr)->ushort_at_put(i + instanceKlass::signature_index_offset, 2706 word_sig_index); 2707 fac_ptr->nonstatic_word_count += 1; 2708 2709 FieldAllocationType atype = (FieldAllocationType) (*fields_ptr)->ushort_at(i + instanceKlass::low_offset); 2710 assert(atype == NONSTATIC_BYTE, ""); 2711 FieldAllocationType new_atype = NONSTATIC_WORD; 2712 (*fields_ptr)->ushort_at_put(i + instanceKlass::low_offset, new_atype); 2713 2714 found_vmentry = true; 2715 break; 2716 } 2717 } 2718 2719 if (!found_vmentry) 2720 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), 2721 "missing vmentry byte field in java.dyn.MethodHandle"); 2722 2723 } 2724 2725 2726 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name, 2727 Handle class_loader, 2728 Handle protection_domain, 2729 KlassHandle host_klass, 2730 GrowableArray<Handle>* cp_patches, 2731 symbolHandle& parsed_name, 2732 bool verify, 2733 TRAPS) { 2734 // So that JVMTI can cache class file in the state before retransformable agents 2735 // have modified it 2736 unsigned char *cached_class_file_bytes = NULL; 2737 jint cached_class_file_length; 2738 2739 ClassFileStream* cfs = stream(); 2740 // Timing 2741 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 2742 JavaThread* jt = (JavaThread*) THREAD; 2743 2744 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), 2745 ClassLoader::perf_class_parse_selftime(), 2746 NULL, 2747 jt->get_thread_stat()->perf_recursion_counts_addr(), 2748 jt->get_thread_stat()->perf_timers_addr(), 2749 PerfClassTraceTime::PARSE_CLASS); 2750 2751 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false; 2752 2753 if (JvmtiExport::should_post_class_file_load_hook()) { 2754 unsigned char* ptr = cfs->buffer(); 2755 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 2756 2757 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain, 2758 &ptr, &end_ptr, 2759 &cached_class_file_bytes, 2760 &cached_class_file_length); 2761 2762 if (ptr != cfs->buffer()) { 2763 // JVMTI agent has modified class file data. 2764 // Set new class file stream using JVMTI agent modified 2765 // class file data. 2766 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 2767 set_stream(cfs); 2768 } 2769 } 2770 2771 _host_klass = host_klass; 2772 _cp_patches = cp_patches; 2773 2774 instanceKlassHandle nullHandle; 2775 2776 // Figure out whether we can skip format checking (matching classic VM behavior) 2777 _need_verify = Verifier::should_verify_for(class_loader(), verify); 2778 2779 // Set the verify flag in stream 2780 cfs->set_verify(_need_verify); 2781 2782 // Save the class file name for easier error message printing. 2783 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name(); 2784 2785 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 2786 // Magic value 2787 u4 magic = cfs->get_u4_fast(); 2788 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 2789 "Incompatible magic value %u in class file %s", 2790 magic, CHECK_(nullHandle)); 2791 2792 // Version numbers 2793 u2 minor_version = cfs->get_u2_fast(); 2794 u2 major_version = cfs->get_u2_fast(); 2795 2796 // Check version numbers - we check this even with verifier off 2797 if (!is_supported_version(major_version, minor_version)) { 2798 if (name.is_null()) { 2799 Exceptions::fthrow( 2800 THREAD_AND_LOCATION, 2801 vmSymbolHandles::java_lang_UnsupportedClassVersionError(), 2802 "Unsupported major.minor version %u.%u", 2803 major_version, 2804 minor_version); 2805 } else { 2806 ResourceMark rm(THREAD); 2807 Exceptions::fthrow( 2808 THREAD_AND_LOCATION, 2809 vmSymbolHandles::java_lang_UnsupportedClassVersionError(), 2810 "%s : Unsupported major.minor version %u.%u", 2811 name->as_C_string(), 2812 major_version, 2813 minor_version); 2814 } 2815 return nullHandle; 2816 } 2817 2818 _major_version = major_version; 2819 _minor_version = minor_version; 2820 2821 2822 // Check if verification needs to be relaxed for this class file 2823 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 2824 _relax_verify = Verifier::relax_verify_for(class_loader()); 2825 2826 // Constant pool 2827 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 2828 int cp_size = cp->length(); 2829 2830 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 2831 2832 // Access flags 2833 AccessFlags access_flags; 2834 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 2835 2836 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2837 // Set abstract bit for old class files for backward compatibility 2838 flags |= JVM_ACC_ABSTRACT; 2839 } 2840 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 2841 access_flags.set_flags(flags); 2842 2843 // This class and superclass 2844 instanceKlassHandle super_klass; 2845 u2 this_class_index = cfs->get_u2_fast(); 2846 check_property( 2847 valid_cp_range(this_class_index, cp_size) && 2848 cp->tag_at(this_class_index).is_unresolved_klass(), 2849 "Invalid this class index %u in constant pool in class file %s", 2850 this_class_index, CHECK_(nullHandle)); 2851 2852 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index)); 2853 assert(class_name.not_null(), "class_name can't be null"); 2854 2855 // It's important to set parsed_name *before* resolving the super class. 2856 // (it's used for cleanup by the caller if parsing fails) 2857 parsed_name = class_name; 2858 2859 // Update _class_name which could be null previously to be class_name 2860 _class_name = class_name; 2861 2862 // Don't need to check whether this class name is legal or not. 2863 // It has been checked when constant pool is parsed. 2864 // However, make sure it is not an array type. 2865 if (_need_verify) { 2866 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 2867 "Bad class name in class file %s", 2868 CHECK_(nullHandle)); 2869 } 2870 2871 klassOop preserve_this_klass; // for storing result across HandleMark 2872 2873 // release all handles when parsing is done 2874 { HandleMark hm(THREAD); 2875 2876 // Checks if name in class file matches requested name 2877 if (name.not_null() && class_name() != name()) { 2878 ResourceMark rm(THREAD); 2879 Exceptions::fthrow( 2880 THREAD_AND_LOCATION, 2881 vmSymbolHandles::java_lang_NoClassDefFoundError(), 2882 "%s (wrong name: %s)", 2883 name->as_C_string(), 2884 class_name->as_C_string() 2885 ); 2886 return nullHandle; 2887 } 2888 2889 if (TraceClassLoadingPreorder) { 2890 tty->print("[Loading %s", name()->as_klass_external_name()); 2891 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 2892 tty->print_cr("]"); 2893 } 2894 2895 u2 super_class_index = cfs->get_u2_fast(); 2896 if (super_class_index == 0) { 2897 check_property(class_name() == vmSymbols::java_lang_Object(), 2898 "Invalid superclass index %u in class file %s", 2899 super_class_index, 2900 CHECK_(nullHandle)); 2901 } else { 2902 check_property(valid_cp_range(super_class_index, cp_size) && 2903 is_klass_reference(cp, super_class_index), 2904 "Invalid superclass index %u in class file %s", 2905 super_class_index, 2906 CHECK_(nullHandle)); 2907 // The class name should be legal because it is checked when parsing constant pool. 2908 // However, make sure it is not an array type. 2909 bool is_array = false; 2910 if (cp->tag_at(super_class_index).is_klass()) { 2911 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index)); 2912 if (_need_verify) 2913 is_array = super_klass->oop_is_array(); 2914 } else if (_need_verify) { 2915 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 2916 } 2917 if (_need_verify) { 2918 guarantee_property(!is_array, 2919 "Bad superclass name in class file %s", CHECK_(nullHandle)); 2920 } 2921 } 2922 2923 // Interfaces 2924 u2 itfs_len = cfs->get_u2_fast(); 2925 objArrayHandle local_interfaces; 2926 if (itfs_len == 0) { 2927 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 2928 } else { 2929 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle)); 2930 } 2931 2932 // Fields (offsets are filled in later) 2933 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0}; 2934 objArrayHandle fields_annotations; 2935 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle)); 2936 // Methods 2937 bool has_final_method = false; 2938 AccessFlags promoted_flags; 2939 promoted_flags.set_flags(0); 2940 // These need to be oop pointers because they are allocated lazily 2941 // inside parse_methods inside a nested HandleMark 2942 objArrayOop methods_annotations_oop = NULL; 2943 objArrayOop methods_parameter_annotations_oop = NULL; 2944 objArrayOop methods_default_annotations_oop = NULL; 2945 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(), 2946 &promoted_flags, 2947 &has_final_method, 2948 &methods_annotations_oop, 2949 &methods_parameter_annotations_oop, 2950 &methods_default_annotations_oop, 2951 CHECK_(nullHandle)); 2952 2953 objArrayHandle methods_annotations(THREAD, methods_annotations_oop); 2954 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop); 2955 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop); 2956 2957 // We check super class after class file is parsed and format is checked 2958 if (super_class_index > 0 && super_klass.is_null()) { 2959 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index)); 2960 if (access_flags.is_interface()) { 2961 // Before attempting to resolve the superclass, check for class format 2962 // errors not checked yet. 2963 guarantee_property(sk() == vmSymbols::java_lang_Object(), 2964 "Interfaces must have java.lang.Object as superclass in class file %s", 2965 CHECK_(nullHandle)); 2966 } 2967 klassOop k = SystemDictionary::resolve_super_or_fail(class_name, 2968 sk, 2969 class_loader, 2970 protection_domain, 2971 true, 2972 CHECK_(nullHandle)); 2973 2974 KlassHandle kh (THREAD, k); 2975 super_klass = instanceKlassHandle(THREAD, kh()); 2976 if (LinkWellKnownClasses) // my super class is well known to me 2977 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve 2978 } 2979 if (super_klass.not_null()) { 2980 if (super_klass->is_interface()) { 2981 ResourceMark rm(THREAD); 2982 Exceptions::fthrow( 2983 THREAD_AND_LOCATION, 2984 vmSymbolHandles::java_lang_IncompatibleClassChangeError(), 2985 "class %s has interface %s as super class", 2986 class_name->as_klass_external_name(), 2987 super_klass->external_name() 2988 ); 2989 return nullHandle; 2990 } 2991 // Make sure super class is not final 2992 if (super_klass->is_final()) { 2993 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 2994 } 2995 } 2996 2997 // Compute the transitive list of all unique interfaces implemented by this class 2998 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 2999 3000 // sort methods 3001 typeArrayHandle method_ordering = sort_methods(methods, 3002 methods_annotations, 3003 methods_parameter_annotations, 3004 methods_default_annotations, 3005 CHECK_(nullHandle)); 3006 3007 // promote flags from parse_methods() to the klass' flags 3008 access_flags.add_promoted_flags(promoted_flags.as_int()); 3009 3010 // Size of Java vtable (in words) 3011 int vtable_size = 0; 3012 int itable_size = 0; 3013 int num_miranda_methods = 0; 3014 3015 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size, 3016 num_miranda_methods, 3017 super_klass(), 3018 methods(), 3019 access_flags, 3020 class_loader, 3021 class_name, 3022 local_interfaces(), 3023 CHECK_(nullHandle)); 3024 3025 // Size of Java itable (in words) 3026 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces); 3027 3028 // Field size and offset computation 3029 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size(); 3030 #ifndef PRODUCT 3031 int orig_nonstatic_field_size = 0; 3032 #endif 3033 int static_field_size = 0; 3034 int next_static_oop_offset; 3035 int next_static_double_offset; 3036 int next_static_word_offset; 3037 int next_static_short_offset; 3038 int next_static_byte_offset; 3039 int next_static_type_offset; 3040 int next_nonstatic_oop_offset; 3041 int next_nonstatic_double_offset; 3042 int next_nonstatic_word_offset; 3043 int next_nonstatic_short_offset; 3044 int next_nonstatic_byte_offset; 3045 int next_nonstatic_type_offset; 3046 int first_nonstatic_oop_offset; 3047 int first_nonstatic_field_offset; 3048 int next_nonstatic_field_offset; 3049 3050 // Calculate the starting byte offsets 3051 next_static_oop_offset = (instanceKlass::header_size() + 3052 align_object_offset(vtable_size) + 3053 align_object_offset(itable_size)) * wordSize; 3054 next_static_double_offset = next_static_oop_offset + 3055 (fac.static_oop_count * heapOopSize); 3056 if ( fac.static_double_count && 3057 (Universe::field_type_should_be_aligned(T_DOUBLE) || 3058 Universe::field_type_should_be_aligned(T_LONG)) ) { 3059 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 3060 } 3061 3062 next_static_word_offset = next_static_double_offset + 3063 (fac.static_double_count * BytesPerLong); 3064 next_static_short_offset = next_static_word_offset + 3065 (fac.static_word_count * BytesPerInt); 3066 next_static_byte_offset = next_static_short_offset + 3067 (fac.static_short_count * BytesPerShort); 3068 next_static_type_offset = align_size_up((next_static_byte_offset + 3069 fac.static_byte_count ), wordSize ); 3070 static_field_size = (next_static_type_offset - 3071 next_static_oop_offset) / wordSize; 3072 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() + 3073 nonstatic_field_size * heapOopSize; 3074 next_nonstatic_field_offset = first_nonstatic_field_offset; 3075 3076 // Add fake fields for java.lang.Class instances (also see below) 3077 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) { 3078 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle)); 3079 } 3080 3081 // adjust the vmentry field declaration in java.dyn.MethodHandle 3082 if (EnableMethodHandles && class_name() == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) { 3083 java_dyn_MethodHandle_fix_pre(cp, &fields, &fac, CHECK_(nullHandle)); 3084 } 3085 3086 // Add a fake "discovered" field if it is not present 3087 // for compatibility with earlier jdk's. 3088 if (class_name() == vmSymbols::java_lang_ref_Reference() 3089 && class_loader.is_null()) { 3090 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle)); 3091 } 3092 // end of "discovered" field compactibility fix 3093 3094 unsigned int nonstatic_double_count = fac.nonstatic_double_count; 3095 unsigned int nonstatic_word_count = fac.nonstatic_word_count; 3096 unsigned int nonstatic_short_count = fac.nonstatic_short_count; 3097 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count; 3098 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count; 3099 3100 bool super_has_nonstatic_fields = 3101 (super_klass() != NULL && super_klass->has_nonstatic_fields()); 3102 bool has_nonstatic_fields = super_has_nonstatic_fields || 3103 ((nonstatic_double_count + nonstatic_word_count + 3104 nonstatic_short_count + nonstatic_byte_count + 3105 nonstatic_oop_count) != 0); 3106 3107 3108 // Prepare list of oops for oop map generation. 3109 int* nonstatic_oop_offsets; 3110 unsigned int* nonstatic_oop_counts; 3111 unsigned int nonstatic_oop_map_count = 0; 3112 3113 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3114 THREAD, int, nonstatic_oop_count + 1); 3115 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3116 THREAD, unsigned int, nonstatic_oop_count + 1); 3117 3118 // Add fake fields for java.lang.Class instances (also see above). 3119 // FieldsAllocationStyle and CompactFields values will be reset to default. 3120 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) { 3121 java_lang_Class_fix_post(&next_nonstatic_field_offset); 3122 nonstatic_oop_offsets[0] = first_nonstatic_field_offset; 3123 const uint fake_oop_count = (next_nonstatic_field_offset - 3124 first_nonstatic_field_offset) / heapOopSize; 3125 nonstatic_oop_counts[0] = fake_oop_count; 3126 nonstatic_oop_map_count = 1; 3127 nonstatic_oop_count -= fake_oop_count; 3128 first_nonstatic_oop_offset = first_nonstatic_field_offset; 3129 } else { 3130 first_nonstatic_oop_offset = 0; // will be set for first oop field 3131 } 3132 3133 #ifndef PRODUCT 3134 if( PrintCompactFieldsSavings ) { 3135 next_nonstatic_double_offset = next_nonstatic_field_offset + 3136 (nonstatic_oop_count * heapOopSize); 3137 if ( nonstatic_double_count > 0 ) { 3138 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong); 3139 } 3140 next_nonstatic_word_offset = next_nonstatic_double_offset + 3141 (nonstatic_double_count * BytesPerLong); 3142 next_nonstatic_short_offset = next_nonstatic_word_offset + 3143 (nonstatic_word_count * BytesPerInt); 3144 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3145 (nonstatic_short_count * BytesPerShort); 3146 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset + 3147 nonstatic_byte_count ), heapOopSize ); 3148 orig_nonstatic_field_size = nonstatic_field_size + 3149 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize); 3150 } 3151 #endif 3152 bool compact_fields = CompactFields; 3153 int allocation_style = FieldsAllocationStyle; 3154 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3155 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3156 allocation_style = 1; // Optimistic 3157 } 3158 3159 // The next classes have predefined hard-coded fields offsets 3160 // (see in JavaClasses::compute_hard_coded_offsets()). 3161 // Use default fields allocation order for them. 3162 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 3163 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() || 3164 class_name() == vmSymbols::java_lang_Class() || 3165 class_name() == vmSymbols::java_lang_ClassLoader() || 3166 class_name() == vmSymbols::java_lang_ref_Reference() || 3167 class_name() == vmSymbols::java_lang_ref_SoftReference() || 3168 class_name() == vmSymbols::java_lang_StackTraceElement() || 3169 class_name() == vmSymbols::java_lang_String() || 3170 class_name() == vmSymbols::java_lang_Throwable() || 3171 class_name() == vmSymbols::java_lang_Boolean() || 3172 class_name() == vmSymbols::java_lang_Character() || 3173 class_name() == vmSymbols::java_lang_Float() || 3174 class_name() == vmSymbols::java_lang_Double() || 3175 class_name() == vmSymbols::java_lang_Byte() || 3176 class_name() == vmSymbols::java_lang_Short() || 3177 class_name() == vmSymbols::java_lang_Integer() || 3178 class_name() == vmSymbols::java_lang_Long())) { 3179 allocation_style = 0; // Allocate oops first 3180 compact_fields = false; // Don't compact fields 3181 } 3182 3183 if( allocation_style == 0 ) { 3184 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes 3185 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3186 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3187 (nonstatic_oop_count * heapOopSize); 3188 } else if( allocation_style == 1 ) { 3189 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops 3190 next_nonstatic_double_offset = next_nonstatic_field_offset; 3191 } else if( allocation_style == 2 ) { 3192 // Fields allocation: oops fields in super and sub classes are together. 3193 if( nonstatic_field_size > 0 && super_klass() != NULL && 3194 super_klass->nonstatic_oop_map_size() > 0 ) { 3195 int map_size = super_klass->nonstatic_oop_map_size(); 3196 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps(); 3197 OopMapBlock* last_map = first_map + map_size - 1; 3198 int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3199 if (next_offset == next_nonstatic_field_offset) { 3200 allocation_style = 0; // allocate oops first 3201 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3202 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3203 (nonstatic_oop_count * heapOopSize); 3204 } 3205 } 3206 if( allocation_style == 2 ) { 3207 allocation_style = 1; // allocate oops last 3208 next_nonstatic_double_offset = next_nonstatic_field_offset; 3209 } 3210 } else { 3211 ShouldNotReachHere(); 3212 } 3213 3214 int nonstatic_oop_space_count = 0; 3215 int nonstatic_word_space_count = 0; 3216 int nonstatic_short_space_count = 0; 3217 int nonstatic_byte_space_count = 0; 3218 int nonstatic_oop_space_offset; 3219 int nonstatic_word_space_offset; 3220 int nonstatic_short_space_offset; 3221 int nonstatic_byte_space_offset; 3222 3223 if( nonstatic_double_count > 0 ) { 3224 int offset = next_nonstatic_double_offset; 3225 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3226 if( compact_fields && offset != next_nonstatic_double_offset ) { 3227 // Allocate available fields into the gap before double field. 3228 int length = next_nonstatic_double_offset - offset; 3229 assert(length == BytesPerInt, ""); 3230 nonstatic_word_space_offset = offset; 3231 if( nonstatic_word_count > 0 ) { 3232 nonstatic_word_count -= 1; 3233 nonstatic_word_space_count = 1; // Only one will fit 3234 length -= BytesPerInt; 3235 offset += BytesPerInt; 3236 } 3237 nonstatic_short_space_offset = offset; 3238 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 3239 nonstatic_short_count -= 1; 3240 nonstatic_short_space_count += 1; 3241 length -= BytesPerShort; 3242 offset += BytesPerShort; 3243 } 3244 nonstatic_byte_space_offset = offset; 3245 while( length > 0 && nonstatic_byte_count > 0 ) { 3246 nonstatic_byte_count -= 1; 3247 nonstatic_byte_space_count += 1; 3248 length -= 1; 3249 } 3250 // Allocate oop field in the gap if there are no other fields for that. 3251 nonstatic_oop_space_offset = offset; 3252 if( length >= heapOopSize && nonstatic_oop_count > 0 && 3253 allocation_style != 0 ) { // when oop fields not first 3254 nonstatic_oop_count -= 1; 3255 nonstatic_oop_space_count = 1; // Only one will fit 3256 length -= heapOopSize; 3257 offset += heapOopSize; 3258 } 3259 } 3260 } 3261 3262 next_nonstatic_word_offset = next_nonstatic_double_offset + 3263 (nonstatic_double_count * BytesPerLong); 3264 next_nonstatic_short_offset = next_nonstatic_word_offset + 3265 (nonstatic_word_count * BytesPerInt); 3266 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3267 (nonstatic_short_count * BytesPerShort); 3268 3269 int notaligned_offset; 3270 if( allocation_style == 0 ) { 3271 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count; 3272 } else { // allocation_style == 1 3273 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count; 3274 if( nonstatic_oop_count > 0 ) { 3275 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3276 } 3277 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3278 } 3279 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize ); 3280 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset 3281 - first_nonstatic_field_offset)/heapOopSize); 3282 3283 // Iterate over fields again and compute correct offsets. 3284 // The field allocation type was temporarily stored in the offset slot. 3285 // oop fields are located before non-oop fields (static and non-static). 3286 int len = fields->length(); 3287 for (int i = 0; i < len; i += instanceKlass::next_offset) { 3288 int real_offset; 3289 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset); 3290 switch (atype) { 3291 case STATIC_OOP: 3292 real_offset = next_static_oop_offset; 3293 next_static_oop_offset += heapOopSize; 3294 break; 3295 case STATIC_BYTE: 3296 real_offset = next_static_byte_offset; 3297 next_static_byte_offset += 1; 3298 break; 3299 case STATIC_SHORT: 3300 real_offset = next_static_short_offset; 3301 next_static_short_offset += BytesPerShort; 3302 break; 3303 case STATIC_WORD: 3304 real_offset = next_static_word_offset; 3305 next_static_word_offset += BytesPerInt; 3306 break; 3307 case STATIC_ALIGNED_DOUBLE: 3308 case STATIC_DOUBLE: 3309 real_offset = next_static_double_offset; 3310 next_static_double_offset += BytesPerLong; 3311 break; 3312 case NONSTATIC_OOP: 3313 if( nonstatic_oop_space_count > 0 ) { 3314 real_offset = nonstatic_oop_space_offset; 3315 nonstatic_oop_space_offset += heapOopSize; 3316 nonstatic_oop_space_count -= 1; 3317 } else { 3318 real_offset = next_nonstatic_oop_offset; 3319 next_nonstatic_oop_offset += heapOopSize; 3320 } 3321 // Update oop maps 3322 if( nonstatic_oop_map_count > 0 && 3323 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3324 real_offset - 3325 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3326 heapOopSize ) { 3327 // Extend current oop map 3328 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3329 } else { 3330 // Create new oop map 3331 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3332 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3333 nonstatic_oop_map_count += 1; 3334 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3335 first_nonstatic_oop_offset = real_offset; 3336 } 3337 } 3338 break; 3339 case NONSTATIC_BYTE: 3340 if( nonstatic_byte_space_count > 0 ) { 3341 real_offset = nonstatic_byte_space_offset; 3342 nonstatic_byte_space_offset += 1; 3343 nonstatic_byte_space_count -= 1; 3344 } else { 3345 real_offset = next_nonstatic_byte_offset; 3346 next_nonstatic_byte_offset += 1; 3347 } 3348 break; 3349 case NONSTATIC_SHORT: 3350 if( nonstatic_short_space_count > 0 ) { 3351 real_offset = nonstatic_short_space_offset; 3352 nonstatic_short_space_offset += BytesPerShort; 3353 nonstatic_short_space_count -= 1; 3354 } else { 3355 real_offset = next_nonstatic_short_offset; 3356 next_nonstatic_short_offset += BytesPerShort; 3357 } 3358 break; 3359 case NONSTATIC_WORD: 3360 if( nonstatic_word_space_count > 0 ) { 3361 real_offset = nonstatic_word_space_offset; 3362 nonstatic_word_space_offset += BytesPerInt; 3363 nonstatic_word_space_count -= 1; 3364 } else { 3365 real_offset = next_nonstatic_word_offset; 3366 next_nonstatic_word_offset += BytesPerInt; 3367 } 3368 break; 3369 case NONSTATIC_ALIGNED_DOUBLE: 3370 case NONSTATIC_DOUBLE: 3371 real_offset = next_nonstatic_double_offset; 3372 next_nonstatic_double_offset += BytesPerLong; 3373 break; 3374 default: 3375 ShouldNotReachHere(); 3376 } 3377 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset)); 3378 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset)); 3379 } 3380 3381 // Size of instances 3382 int instance_size; 3383 3384 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize ); 3385 instance_size = align_object_size(next_nonstatic_type_offset / wordSize); 3386 3387 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value"); 3388 3389 // Number of non-static oop map blocks allocated at end of klass. 3390 const unsigned int total_oop_map_count = 3391 compute_oop_map_count(super_klass, nonstatic_oop_map_count, 3392 first_nonstatic_oop_offset); 3393 3394 // Compute reference type 3395 ReferenceType rt; 3396 if (super_klass() == NULL) { 3397 rt = REF_NONE; 3398 } else { 3399 rt = super_klass->reference_type(); 3400 } 3401 3402 // We can now create the basic klassOop for this klass 3403 klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size, 3404 static_field_size, 3405 total_oop_map_count, 3406 rt, CHECK_(nullHandle)); 3407 instanceKlassHandle this_klass (THREAD, ik); 3408 3409 assert(this_klass->static_field_size() == static_field_size, "sanity"); 3410 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count, 3411 "sanity"); 3412 3413 // Fill in information already parsed 3414 this_klass->set_access_flags(access_flags); 3415 this_klass->set_should_verify_class(verify); 3416 jint lh = Klass::instance_layout_helper(instance_size, false); 3417 this_klass->set_layout_helper(lh); 3418 assert(this_klass->oop_is_instance(), "layout is correct"); 3419 assert(this_klass->size_helper() == instance_size, "correct size_helper"); 3420 // Not yet: supers are done below to support the new subtype-checking fields 3421 //this_klass->set_super(super_klass()); 3422 this_klass->set_class_loader(class_loader()); 3423 this_klass->set_nonstatic_field_size(nonstatic_field_size); 3424 this_klass->set_has_nonstatic_fields(has_nonstatic_fields); 3425 this_klass->set_static_oop_field_size(fac.static_oop_count); 3426 cp->set_pool_holder(this_klass()); 3427 this_klass->set_constants(cp()); 3428 this_klass->set_local_interfaces(local_interfaces()); 3429 this_klass->set_fields(fields()); 3430 this_klass->set_methods(methods()); 3431 if (has_final_method) { 3432 this_klass->set_has_final_method(); 3433 } 3434 this_klass->set_method_ordering(method_ordering()); 3435 // The instanceKlass::_methods_jmethod_ids cache and the 3436 // instanceKlass::_methods_cached_itable_indices cache are 3437 // both managed on the assumption that the initial cache 3438 // size is equal to the number of methods in the class. If 3439 // that changes, then instanceKlass::idnum_can_increment() 3440 // has to be changed accordingly. 3441 this_klass->set_initial_method_idnum(methods->length()); 3442 this_klass->set_name(cp->klass_name_at(this_class_index)); 3443 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself 3444 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve 3445 this_klass->set_protection_domain(protection_domain()); 3446 this_klass->set_fields_annotations(fields_annotations()); 3447 this_klass->set_methods_annotations(methods_annotations()); 3448 this_klass->set_methods_parameter_annotations(methods_parameter_annotations()); 3449 this_klass->set_methods_default_annotations(methods_default_annotations()); 3450 3451 this_klass->set_minor_version(minor_version); 3452 this_klass->set_major_version(major_version); 3453 3454 // Set up methodOop::intrinsic_id as soon as we know the names of methods. 3455 // (We used to do this lazily, but now we query it in Rewriter, 3456 // which is eagerly done for every method, so we might as well do it now, 3457 // when everything is fresh in memory.) 3458 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) { 3459 for (int j = 0; j < methods->length(); j++) { 3460 ((methodOop)methods->obj_at(j))->init_intrinsic_id(); 3461 } 3462 } 3463 3464 if (cached_class_file_bytes != NULL) { 3465 // JVMTI: we have an instanceKlass now, tell it about the cached bytes 3466 this_klass->set_cached_class_file(cached_class_file_bytes, 3467 cached_class_file_length); 3468 } 3469 3470 // Miranda methods 3471 if ((num_miranda_methods > 0) || 3472 // if this class introduced new miranda methods or 3473 (super_klass.not_null() && (super_klass->has_miranda_methods())) 3474 // super class exists and this class inherited miranda methods 3475 ) { 3476 this_klass->set_has_miranda_methods(); // then set a flag 3477 } 3478 3479 // Additional attributes 3480 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle)); 3481 3482 // Make sure this is the end of class file stream 3483 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 3484 3485 // Initialize static fields 3486 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle)); 3487 3488 // VerifyOops believes that once this has been set, the object is completely loaded. 3489 // Compute transitive closure of interfaces this class implements 3490 this_klass->set_transitive_interfaces(transitive_interfaces()); 3491 3492 // Fill in information needed to compute superclasses. 3493 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 3494 3495 // Initialize itable offset tables 3496 klassItable::setup_itable_offset_table(this_klass); 3497 3498 // Do final class setup 3499 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts); 3500 3501 set_precomputed_flags(this_klass); 3502 3503 // reinitialize modifiers, using the InnerClasses attribute 3504 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 3505 this_klass->set_modifier_flags(computed_modifiers); 3506 3507 // check if this class can access its super class 3508 check_super_class_access(this_klass, CHECK_(nullHandle)); 3509 3510 // check if this class can access its superinterfaces 3511 check_super_interface_access(this_klass, CHECK_(nullHandle)); 3512 3513 // check if this class overrides any final method 3514 check_final_method_override(this_klass, CHECK_(nullHandle)); 3515 3516 // check that if this class is an interface then it doesn't have static methods 3517 if (this_klass->is_interface()) { 3518 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 3519 } 3520 3521 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()), 3522 false /* not shared class */); 3523 3524 if (TraceClassLoading) { 3525 // print in a single call to reduce interleaving of output 3526 if (cfs->source() != NULL) { 3527 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 3528 cfs->source()); 3529 } else if (class_loader.is_null()) { 3530 if (THREAD->is_Java_thread()) { 3531 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1); 3532 tty->print("[Loaded %s by instance of %s]\n", 3533 this_klass->external_name(), 3534 instanceKlass::cast(caller)->external_name()); 3535 } else { 3536 tty->print("[Loaded %s]\n", this_klass->external_name()); 3537 } 3538 } else { 3539 ResourceMark rm; 3540 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 3541 instanceKlass::cast(class_loader->klass())->external_name()); 3542 } 3543 } 3544 3545 if (TraceClassResolution) { 3546 // print out the superclass. 3547 const char * from = Klass::cast(this_klass())->external_name(); 3548 if (this_klass->java_super() != NULL) { 3549 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name()); 3550 } 3551 // print out each of the interface classes referred to by this class. 3552 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces()); 3553 if (!local_interfaces.is_null()) { 3554 int length = local_interfaces->length(); 3555 for (int i = 0; i < length; i++) { 3556 klassOop k = klassOop(local_interfaces->obj_at(i)); 3557 instanceKlass* to_class = instanceKlass::cast(k); 3558 const char * to = to_class->external_name(); 3559 tty->print("RESOLVE %s %s (interface)\n", from, to); 3560 } 3561 } 3562 } 3563 3564 #ifndef PRODUCT 3565 if( PrintCompactFieldsSavings ) { 3566 if( nonstatic_field_size < orig_nonstatic_field_size ) { 3567 tty->print("[Saved %d of %d bytes in %s]\n", 3568 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize, 3569 orig_nonstatic_field_size*heapOopSize, 3570 this_klass->external_name()); 3571 } else if( nonstatic_field_size > orig_nonstatic_field_size ) { 3572 tty->print("[Wasted %d over %d bytes in %s]\n", 3573 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize, 3574 orig_nonstatic_field_size*heapOopSize, 3575 this_klass->external_name()); 3576 } 3577 } 3578 #endif 3579 3580 // preserve result across HandleMark 3581 preserve_this_klass = this_klass(); 3582 } 3583 3584 // Create new handle outside HandleMark 3585 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 3586 debug_only(this_klass->as_klassOop()->verify();) 3587 3588 return this_klass; 3589 } 3590 3591 3592 unsigned int 3593 ClassFileParser::compute_oop_map_count(instanceKlassHandle super, 3594 unsigned int nonstatic_oop_map_count, 3595 int first_nonstatic_oop_offset) { 3596 unsigned int map_count = 3597 super.is_null() ? 0 : super->nonstatic_oop_map_count(); 3598 if (nonstatic_oop_map_count > 0) { 3599 // We have oops to add to map 3600 if (map_count == 0) { 3601 map_count = nonstatic_oop_map_count; 3602 } else { 3603 // Check whether we should add a new map block or whether the last one can 3604 // be extended 3605 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 3606 OopMapBlock* const last_map = first_map + map_count - 1; 3607 3608 int next_offset = last_map->offset() + last_map->count() * heapOopSize; 3609 if (next_offset == first_nonstatic_oop_offset) { 3610 // There is no gap bettwen superklass's last oop field and first 3611 // local oop field, merge maps. 3612 nonstatic_oop_map_count -= 1; 3613 } else { 3614 // Superklass didn't end with a oop field, add extra maps 3615 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 3616 } 3617 map_count += nonstatic_oop_map_count; 3618 } 3619 } 3620 return map_count; 3621 } 3622 3623 3624 void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 3625 unsigned int nonstatic_oop_map_count, 3626 int* nonstatic_oop_offsets, 3627 unsigned int* nonstatic_oop_counts) { 3628 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 3629 const instanceKlass* const super = k->superklass(); 3630 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 3631 if (super_count > 0) { 3632 // Copy maps from superklass 3633 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 3634 for (unsigned int i = 0; i < super_count; ++i) { 3635 *this_oop_map++ = *super_oop_map++; 3636 } 3637 } 3638 3639 if (nonstatic_oop_map_count > 0) { 3640 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 3641 // The counts differ because there is no gap between superklass's last oop 3642 // field and the first local oop field. Extend the last oop map copied 3643 // from the superklass instead of creating new one. 3644 nonstatic_oop_map_count--; 3645 nonstatic_oop_offsets++; 3646 this_oop_map--; 3647 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 3648 this_oop_map++; 3649 } 3650 3651 // Add new map blocks, fill them 3652 while (nonstatic_oop_map_count-- > 0) { 3653 this_oop_map->set_offset(*nonstatic_oop_offsets++); 3654 this_oop_map->set_count(*nonstatic_oop_counts++); 3655 this_oop_map++; 3656 } 3657 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 3658 this_oop_map, "sanity"); 3659 } 3660 } 3661 3662 3663 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 3664 klassOop super = k->super(); 3665 3666 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 3667 // in which case we don't have to register objects as finalizable 3668 if (!_has_empty_finalizer) { 3669 if (_has_finalizer || 3670 (super != NULL && super->klass_part()->has_finalizer())) { 3671 k->set_has_finalizer(); 3672 } 3673 } 3674 3675 #ifdef ASSERT 3676 bool f = false; 3677 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(), 3678 vmSymbols::void_method_signature()); 3679 if (m != NULL && !m->is_empty_method()) { 3680 f = true; 3681 } 3682 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 3683 #endif 3684 3685 // Check if this klass supports the java.lang.Cloneable interface 3686 if (SystemDictionary::Cloneable_klass_loaded()) { 3687 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) { 3688 k->set_is_cloneable(); 3689 } 3690 } 3691 3692 // Check if this klass has a vanilla default constructor 3693 if (super == NULL) { 3694 // java.lang.Object has empty default constructor 3695 k->set_has_vanilla_constructor(); 3696 } else { 3697 if (Klass::cast(super)->has_vanilla_constructor() && 3698 _has_vanilla_constructor) { 3699 k->set_has_vanilla_constructor(); 3700 } 3701 #ifdef ASSERT 3702 bool v = false; 3703 if (Klass::cast(super)->has_vanilla_constructor()) { 3704 methodOop constructor = k->find_method(vmSymbols::object_initializer_name( 3705 ), vmSymbols::void_method_signature()); 3706 if (constructor != NULL && constructor->is_vanilla_constructor()) { 3707 v = true; 3708 } 3709 } 3710 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 3711 #endif 3712 } 3713 3714 // If it cannot be fast-path allocated, set a bit in the layout helper. 3715 // See documentation of instanceKlass::can_be_fastpath_allocated(). 3716 assert(k->size_helper() > 0, "layout_helper is initialized"); 3717 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 3718 || k->is_abstract() || k->is_interface() 3719 || (k->name() == vmSymbols::java_lang_Class() 3720 && k->class_loader() == NULL) 3721 || k->size_helper() >= FastAllocateSizeLimit) { 3722 // Forbid fast-path allocation. 3723 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 3724 k->set_layout_helper(lh); 3725 } 3726 } 3727 3728 3729 // utility method for appending and array with check for duplicates 3730 3731 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) { 3732 // iterate over new interfaces 3733 for (int i = 0; i < ifs->length(); i++) { 3734 oop e = ifs->obj_at(i); 3735 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking"); 3736 // check for duplicates 3737 bool duplicate = false; 3738 for (int j = 0; j < index; j++) { 3739 if (result->obj_at(j) == e) { 3740 duplicate = true; 3741 break; 3742 } 3743 } 3744 // add new interface 3745 if (!duplicate) { 3746 result->obj_at_put(index++, e); 3747 } 3748 } 3749 } 3750 3751 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) { 3752 // Compute maximum size for transitive interfaces 3753 int max_transitive_size = 0; 3754 int super_size = 0; 3755 // Add superclass transitive interfaces size 3756 if (super.not_null()) { 3757 super_size = super->transitive_interfaces()->length(); 3758 max_transitive_size += super_size; 3759 } 3760 // Add local interfaces' super interfaces 3761 int local_size = local_ifs->length(); 3762 for (int i = 0; i < local_size; i++) { 3763 klassOop l = klassOop(local_ifs->obj_at(i)); 3764 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length(); 3765 } 3766 // Finally add local interfaces 3767 max_transitive_size += local_size; 3768 // Construct array 3769 objArrayHandle result; 3770 if (max_transitive_size == 0) { 3771 // no interfaces, use canonicalized array 3772 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 3773 } else if (max_transitive_size == super_size) { 3774 // no new local interfaces added, share superklass' transitive interface array 3775 result = objArrayHandle(THREAD, super->transitive_interfaces()); 3776 } else if (max_transitive_size == local_size) { 3777 // only local interfaces added, share local interface array 3778 result = local_ifs; 3779 } else { 3780 objArrayHandle nullHandle; 3781 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle)); 3782 result = objArrayHandle(THREAD, new_objarray); 3783 int index = 0; 3784 // Copy down from superclass 3785 if (super.not_null()) { 3786 append_interfaces(result, index, super->transitive_interfaces()); 3787 } 3788 // Copy down from local interfaces' superinterfaces 3789 for (int i = 0; i < local_ifs->length(); i++) { 3790 klassOop l = klassOop(local_ifs->obj_at(i)); 3791 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces()); 3792 } 3793 // Finally add local interfaces 3794 append_interfaces(result, index, local_ifs()); 3795 3796 // Check if duplicates were removed 3797 if (index != max_transitive_size) { 3798 assert(index < max_transitive_size, "just checking"); 3799 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle)); 3800 for (int i = 0; i < index; i++) { 3801 oop e = result->obj_at(i); 3802 assert(e != NULL, "just checking"); 3803 new_result->obj_at_put(i, e); 3804 } 3805 result = objArrayHandle(THREAD, new_result); 3806 } 3807 } 3808 return result; 3809 } 3810 3811 3812 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 3813 klassOop super = this_klass->super(); 3814 if ((super != NULL) && 3815 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) { 3816 ResourceMark rm(THREAD); 3817 Exceptions::fthrow( 3818 THREAD_AND_LOCATION, 3819 vmSymbolHandles::java_lang_IllegalAccessError(), 3820 "class %s cannot access its superclass %s", 3821 this_klass->external_name(), 3822 instanceKlass::cast(super)->external_name() 3823 ); 3824 return; 3825 } 3826 } 3827 3828 3829 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 3830 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces()); 3831 int lng = local_interfaces->length(); 3832 for (int i = lng - 1; i >= 0; i--) { 3833 klassOop k = klassOop(local_interfaces->obj_at(i)); 3834 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface"); 3835 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) { 3836 ResourceMark rm(THREAD); 3837 Exceptions::fthrow( 3838 THREAD_AND_LOCATION, 3839 vmSymbolHandles::java_lang_IllegalAccessError(), 3840 "class %s cannot access its superinterface %s", 3841 this_klass->external_name(), 3842 instanceKlass::cast(k)->external_name() 3843 ); 3844 return; 3845 } 3846 } 3847 } 3848 3849 3850 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 3851 objArrayHandle methods (THREAD, this_klass->methods()); 3852 int num_methods = methods->length(); 3853 3854 // go thru each method and check if it overrides a final method 3855 for (int index = 0; index < num_methods; index++) { 3856 methodOop m = (methodOop)methods->obj_at(index); 3857 3858 // skip private, static and <init> methods 3859 if ((!m->is_private()) && 3860 (!m->is_static()) && 3861 (m->name() != vmSymbols::object_initializer_name())) { 3862 3863 symbolOop name = m->name(); 3864 symbolOop signature = m->signature(); 3865 klassOop k = this_klass->super(); 3866 methodOop super_m = NULL; 3867 while (k != NULL) { 3868 // skip supers that don't have final methods. 3869 if (k->klass_part()->has_final_method()) { 3870 // lookup a matching method in the super class hierarchy 3871 super_m = instanceKlass::cast(k)->lookup_method(name, signature); 3872 if (super_m == NULL) { 3873 break; // didn't find any match; get out 3874 } 3875 3876 if (super_m->is_final() && 3877 // matching method in super is final 3878 (Reflection::verify_field_access(this_klass->as_klassOop(), 3879 super_m->method_holder(), 3880 super_m->method_holder(), 3881 super_m->access_flags(), false)) 3882 // this class can access super final method and therefore override 3883 ) { 3884 ResourceMark rm(THREAD); 3885 Exceptions::fthrow( 3886 THREAD_AND_LOCATION, 3887 vmSymbolHandles::java_lang_VerifyError(), 3888 "class %s overrides final method %s.%s", 3889 this_klass->external_name(), 3890 name->as_C_string(), 3891 signature->as_C_string() 3892 ); 3893 return; 3894 } 3895 3896 // continue to look from super_m's holder's super. 3897 k = instanceKlass::cast(super_m->method_holder())->super(); 3898 continue; 3899 } 3900 3901 k = k->klass_part()->super(); 3902 } 3903 } 3904 } 3905 } 3906 3907 3908 // assumes that this_klass is an interface 3909 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 3910 assert(this_klass->is_interface(), "not an interface"); 3911 objArrayHandle methods (THREAD, this_klass->methods()); 3912 int num_methods = methods->length(); 3913 3914 for (int index = 0; index < num_methods; index++) { 3915 methodOop m = (methodOop)methods->obj_at(index); 3916 // if m is static and not the init method, throw a verify error 3917 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 3918 ResourceMark rm(THREAD); 3919 Exceptions::fthrow( 3920 THREAD_AND_LOCATION, 3921 vmSymbolHandles::java_lang_VerifyError(), 3922 "Illegal static method %s in interface %s", 3923 m->name()->as_C_string(), 3924 this_klass->external_name() 3925 ); 3926 return; 3927 } 3928 } 3929 } 3930 3931 // utility methods for format checking 3932 3933 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 3934 if (!_need_verify) { return; } 3935 3936 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 3937 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 3938 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3939 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 3940 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 3941 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 3942 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3943 3944 if ((is_abstract && is_final) || 3945 (is_interface && !is_abstract) || 3946 (is_interface && major_gte_15 && (is_super || is_enum)) || 3947 (!is_interface && major_gte_15 && is_annotation)) { 3948 ResourceMark rm(THREAD); 3949 Exceptions::fthrow( 3950 THREAD_AND_LOCATION, 3951 vmSymbolHandles::java_lang_ClassFormatError(), 3952 "Illegal class modifiers in class %s: 0x%X", 3953 _class_name->as_C_string(), flags 3954 ); 3955 return; 3956 } 3957 } 3958 3959 bool ClassFileParser::has_illegal_visibility(jint flags) { 3960 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3961 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 3962 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3963 3964 return ((is_public && is_protected) || 3965 (is_public && is_private) || 3966 (is_protected && is_private)); 3967 } 3968 3969 bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 3970 u2 max_version = 3971 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION : 3972 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION); 3973 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 3974 (major <= max_version) && 3975 ((major != max_version) || 3976 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 3977 } 3978 3979 void ClassFileParser::verify_legal_field_modifiers( 3980 jint flags, bool is_interface, TRAPS) { 3981 if (!_need_verify) { return; } 3982 3983 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3984 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 3985 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3986 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 3987 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3988 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 3989 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 3990 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 3991 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3992 3993 bool is_illegal = false; 3994 3995 if (is_interface) { 3996 if (!is_public || !is_static || !is_final || is_private || 3997 is_protected || is_volatile || is_transient || 3998 (major_gte_15 && is_enum)) { 3999 is_illegal = true; 4000 } 4001 } else { // not interface 4002 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4003 is_illegal = true; 4004 } 4005 } 4006 4007 if (is_illegal) { 4008 ResourceMark rm(THREAD); 4009 Exceptions::fthrow( 4010 THREAD_AND_LOCATION, 4011 vmSymbolHandles::java_lang_ClassFormatError(), 4012 "Illegal field modifiers in class %s: 0x%X", 4013 _class_name->as_C_string(), flags); 4014 return; 4015 } 4016 } 4017 4018 void ClassFileParser::verify_legal_method_modifiers( 4019 jint flags, bool is_interface, symbolHandle name, TRAPS) { 4020 if (!_need_verify) { return; } 4021 4022 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4023 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4024 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4025 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4026 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4027 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4028 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4029 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4030 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4031 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4032 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4033 4034 bool is_illegal = false; 4035 4036 if (is_interface) { 4037 if (!is_abstract || !is_public || is_static || is_final || 4038 is_native || (major_gte_15 && (is_synchronized || is_strict))) { 4039 is_illegal = true; 4040 } 4041 } else { // not interface 4042 if (is_initializer) { 4043 if (is_static || is_final || is_synchronized || is_native || 4044 is_abstract || (major_gte_15 && is_bridge)) { 4045 is_illegal = true; 4046 } 4047 } else { // not initializer 4048 if (is_abstract) { 4049 if ((is_final || is_native || is_private || is_static || 4050 (major_gte_15 && (is_synchronized || is_strict)))) { 4051 is_illegal = true; 4052 } 4053 } 4054 if (has_illegal_visibility(flags)) { 4055 is_illegal = true; 4056 } 4057 } 4058 } 4059 4060 if (is_illegal) { 4061 ResourceMark rm(THREAD); 4062 Exceptions::fthrow( 4063 THREAD_AND_LOCATION, 4064 vmSymbolHandles::java_lang_ClassFormatError(), 4065 "Method %s in class %s has illegal modifiers: 0x%X", 4066 name->as_C_string(), _class_name->as_C_string(), flags); 4067 return; 4068 } 4069 } 4070 4071 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 4072 assert(_need_verify, "only called when _need_verify is true"); 4073 int i = 0; 4074 int count = length >> 2; 4075 for (int k=0; k<count; k++) { 4076 unsigned char b0 = buffer[i]; 4077 unsigned char b1 = buffer[i+1]; 4078 unsigned char b2 = buffer[i+2]; 4079 unsigned char b3 = buffer[i+3]; 4080 // For an unsigned char v, 4081 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 4082 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 4083 unsigned char res = b0 | b0 - 1 | 4084 b1 | b1 - 1 | 4085 b2 | b2 - 1 | 4086 b3 | b3 - 1; 4087 if (res >= 128) break; 4088 i += 4; 4089 } 4090 for(; i < length; i++) { 4091 unsigned short c; 4092 // no embedded zeros 4093 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 4094 if(buffer[i] < 128) { 4095 continue; 4096 } 4097 if ((i + 5) < length) { // see if it's legal supplementary character 4098 if (UTF8::is_supplementary_character(&buffer[i])) { 4099 c = UTF8::get_supplementary_character(&buffer[i]); 4100 i += 5; 4101 continue; 4102 } 4103 } 4104 switch (buffer[i] >> 4) { 4105 default: break; 4106 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 4107 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4108 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 4109 c = (buffer[i] & 0x1F) << 6; 4110 i++; 4111 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 4112 c += buffer[i] & 0x3F; 4113 if (_major_version <= 47 || c == 0 || c >= 0x80) { 4114 // for classes with major > 47, c must a null or a character in its shortest form 4115 break; 4116 } 4117 } 4118 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4119 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 4120 c = (buffer[i] & 0xF) << 12; 4121 i += 2; 4122 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 4123 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 4124 if (_major_version <= 47 || c >= 0x800) { 4125 // for classes with major > 47, c must be in its shortest form 4126 break; 4127 } 4128 } 4129 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4130 } // end of switch 4131 } // end of for 4132 } 4133 4134 // Checks if name is a legal class name. 4135 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) { 4136 if (!_need_verify || _relax_verify) { return; } 4137 4138 char buf[fixed_buffer_size]; 4139 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4140 unsigned int length = name->utf8_length(); 4141 bool legal = false; 4142 4143 if (length > 0) { 4144 char* p; 4145 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 4146 p = skip_over_field_signature(bytes, false, length, CHECK); 4147 legal = (p != NULL) && ((p - bytes) == (int)length); 4148 } else if (_major_version < JAVA_1_5_VERSION) { 4149 if (bytes[0] != '<') { 4150 p = skip_over_field_name(bytes, true, length); 4151 legal = (p != NULL) && ((p - bytes) == (int)length); 4152 } 4153 } else { 4154 // 4900761: relax the constraints based on JSR202 spec 4155 // Class names may be drawn from the entire Unicode character set. 4156 // Identifiers between '/' must be unqualified names. 4157 // The utf8 string has been verified when parsing cpool entries. 4158 legal = verify_unqualified_name(bytes, length, LegalClass); 4159 } 4160 } 4161 if (!legal) { 4162 ResourceMark rm(THREAD); 4163 Exceptions::fthrow( 4164 THREAD_AND_LOCATION, 4165 vmSymbolHandles::java_lang_ClassFormatError(), 4166 "Illegal class name \"%s\" in class file %s", bytes, 4167 _class_name->as_C_string() 4168 ); 4169 return; 4170 } 4171 } 4172 4173 // Checks if name is a legal field name. 4174 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) { 4175 if (!_need_verify || _relax_verify) { return; } 4176 4177 char buf[fixed_buffer_size]; 4178 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4179 unsigned int length = name->utf8_length(); 4180 bool legal = false; 4181 4182 if (length > 0) { 4183 if (_major_version < JAVA_1_5_VERSION) { 4184 if (bytes[0] != '<') { 4185 char* p = skip_over_field_name(bytes, false, length); 4186 legal = (p != NULL) && ((p - bytes) == (int)length); 4187 } 4188 } else { 4189 // 4881221: relax the constraints based on JSR202 spec 4190 legal = verify_unqualified_name(bytes, length, LegalField); 4191 } 4192 } 4193 4194 if (!legal) { 4195 ResourceMark rm(THREAD); 4196 Exceptions::fthrow( 4197 THREAD_AND_LOCATION, 4198 vmSymbolHandles::java_lang_ClassFormatError(), 4199 "Illegal field name \"%s\" in class %s", bytes, 4200 _class_name->as_C_string() 4201 ); 4202 return; 4203 } 4204 } 4205 4206 // Checks if name is a legal method name. 4207 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) { 4208 if (!_need_verify || _relax_verify) { return; } 4209 4210 assert(!name.is_null(), "method name is null"); 4211 char buf[fixed_buffer_size]; 4212 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4213 unsigned int length = name->utf8_length(); 4214 bool legal = false; 4215 4216 if (length > 0) { 4217 if (bytes[0] == '<') { 4218 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 4219 legal = true; 4220 } 4221 } else if (_major_version < JAVA_1_5_VERSION) { 4222 char* p; 4223 p = skip_over_field_name(bytes, false, length); 4224 legal = (p != NULL) && ((p - bytes) == (int)length); 4225 } else { 4226 // 4881221: relax the constraints based on JSR202 spec 4227 legal = verify_unqualified_name(bytes, length, LegalMethod); 4228 } 4229 } 4230 4231 if (!legal) { 4232 ResourceMark rm(THREAD); 4233 Exceptions::fthrow( 4234 THREAD_AND_LOCATION, 4235 vmSymbolHandles::java_lang_ClassFormatError(), 4236 "Illegal method name \"%s\" in class %s", bytes, 4237 _class_name->as_C_string() 4238 ); 4239 return; 4240 } 4241 } 4242 4243 4244 // Checks if signature is a legal field signature. 4245 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) { 4246 if (!_need_verify) { return; } 4247 4248 char buf[fixed_buffer_size]; 4249 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4250 unsigned int length = signature->utf8_length(); 4251 char* p = skip_over_field_signature(bytes, false, length, CHECK); 4252 4253 if (p == NULL || (p - bytes) != (int)length) { 4254 throwIllegalSignature("Field", name, signature, CHECK); 4255 } 4256 } 4257 4258 // Checks if signature is a legal method signature. 4259 // Returns number of parameters 4260 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) { 4261 if (!_need_verify) { 4262 // make sure caller's args_size will be less than 0 even for non-static 4263 // method so it will be recomputed in compute_size_of_parameters(). 4264 return -2; 4265 } 4266 4267 unsigned int args_size = 0; 4268 char buf[fixed_buffer_size]; 4269 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4270 unsigned int length = signature->utf8_length(); 4271 char* nextp; 4272 4273 // The first character must be a '(' 4274 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 4275 length--; 4276 // Skip over legal field signatures 4277 nextp = skip_over_field_signature(p, false, length, CHECK_0); 4278 while ((length > 0) && (nextp != NULL)) { 4279 args_size++; 4280 if (p[0] == 'J' || p[0] == 'D') { 4281 args_size++; 4282 } 4283 length -= nextp - p; 4284 p = nextp; 4285 nextp = skip_over_field_signature(p, false, length, CHECK_0); 4286 } 4287 // The first non-signature thing better be a ')' 4288 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 4289 length--; 4290 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 4291 // All internal methods must return void 4292 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 4293 return args_size; 4294 } 4295 } else { 4296 // Now we better just have a return value 4297 nextp = skip_over_field_signature(p, true, length, CHECK_0); 4298 if (nextp && ((int)length == (nextp - p))) { 4299 return args_size; 4300 } 4301 } 4302 } 4303 } 4304 // Report error 4305 throwIllegalSignature("Method", name, signature, CHECK_0); 4306 return 0; 4307 } 4308 4309 4310 // Unqualified names may not contain the characters '.', ';', or '/'. 4311 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>. 4312 // Note that method names may not be <init> or <clinit> in this method. 4313 // Because these names have been checked as special cases before calling this method 4314 // in verify_legal_method_name. 4315 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) { 4316 jchar ch; 4317 4318 for (char* p = name; p != name + length; ) { 4319 ch = *p; 4320 if (ch < 128) { 4321 p++; 4322 if (ch == '.' || ch == ';') { 4323 return false; // do not permit '.' or ';' 4324 } 4325 if (type != LegalClass && ch == '/') { 4326 return false; // do not permit '/' unless it's class name 4327 } 4328 if (type == LegalMethod && (ch == '<' || ch == '>')) { 4329 return false; // do not permit '<' or '>' in method names 4330 } 4331 } else { 4332 char* tmp_p = UTF8::next(p, &ch); 4333 p = tmp_p; 4334 } 4335 } 4336 return true; 4337 } 4338 4339 4340 // Take pointer to a string. Skip over the longest part of the string that could 4341 // be taken as a fieldname. Allow '/' if slash_ok is true. 4342 // Return a pointer to just past the fieldname. 4343 // Return NULL if no fieldname at all was found, or in the case of slash_ok 4344 // being true, we saw consecutive slashes (meaning we were looking for a 4345 // qualified path but found something that was badly-formed). 4346 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 4347 char* p; 4348 jchar ch; 4349 jboolean last_is_slash = false; 4350 jboolean not_first_ch = false; 4351 4352 for (p = name; p != name + length; not_first_ch = true) { 4353 char* old_p = p; 4354 ch = *p; 4355 if (ch < 128) { 4356 p++; 4357 // quick check for ascii 4358 if ((ch >= 'a' && ch <= 'z') || 4359 (ch >= 'A' && ch <= 'Z') || 4360 (ch == '_' || ch == '$') || 4361 (not_first_ch && ch >= '0' && ch <= '9')) { 4362 last_is_slash = false; 4363 continue; 4364 } 4365 if (slash_ok && ch == '/') { 4366 if (last_is_slash) { 4367 return NULL; // Don't permit consecutive slashes 4368 } 4369 last_is_slash = true; 4370 continue; 4371 } 4372 } else { 4373 jint unicode_ch; 4374 char* tmp_p = UTF8::next_character(p, &unicode_ch); 4375 p = tmp_p; 4376 last_is_slash = false; 4377 // Check if ch is Java identifier start or is Java identifier part 4378 // 4672820: call java.lang.Character methods directly without generating separate tables. 4379 EXCEPTION_MARK; 4380 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass()); 4381 4382 // return value 4383 JavaValue result(T_BOOLEAN); 4384 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 4385 JavaCallArguments args; 4386 args.push_int(unicode_ch); 4387 4388 // public static boolean isJavaIdentifierStart(char ch); 4389 JavaCalls::call_static(&result, 4390 klass, 4391 vmSymbolHandles::isJavaIdentifierStart_name(), 4392 vmSymbolHandles::int_bool_signature(), 4393 &args, 4394 THREAD); 4395 4396 if (HAS_PENDING_EXCEPTION) { 4397 CLEAR_PENDING_EXCEPTION; 4398 return 0; 4399 } 4400 if (result.get_jboolean()) { 4401 continue; 4402 } 4403 4404 if (not_first_ch) { 4405 // public static boolean isJavaIdentifierPart(char ch); 4406 JavaCalls::call_static(&result, 4407 klass, 4408 vmSymbolHandles::isJavaIdentifierPart_name(), 4409 vmSymbolHandles::int_bool_signature(), 4410 &args, 4411 THREAD); 4412 4413 if (HAS_PENDING_EXCEPTION) { 4414 CLEAR_PENDING_EXCEPTION; 4415 return 0; 4416 } 4417 4418 if (result.get_jboolean()) { 4419 continue; 4420 } 4421 } 4422 } 4423 return (not_first_ch) ? old_p : NULL; 4424 } 4425 return (not_first_ch) ? p : NULL; 4426 } 4427 4428 4429 // Take pointer to a string. Skip over the longest part of the string that could 4430 // be taken as a field signature. Allow "void" if void_ok. 4431 // Return a pointer to just past the signature. 4432 // Return NULL if no legal signature is found. 4433 char* ClassFileParser::skip_over_field_signature(char* signature, 4434 bool void_ok, 4435 unsigned int length, 4436 TRAPS) { 4437 unsigned int array_dim = 0; 4438 while (length > 0) { 4439 switch (signature[0]) { 4440 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 4441 case JVM_SIGNATURE_BOOLEAN: 4442 case JVM_SIGNATURE_BYTE: 4443 case JVM_SIGNATURE_CHAR: 4444 case JVM_SIGNATURE_SHORT: 4445 case JVM_SIGNATURE_INT: 4446 case JVM_SIGNATURE_FLOAT: 4447 case JVM_SIGNATURE_LONG: 4448 case JVM_SIGNATURE_DOUBLE: 4449 return signature + 1; 4450 case JVM_SIGNATURE_CLASS: { 4451 if (_major_version < JAVA_1_5_VERSION) { 4452 // Skip over the class name if one is there 4453 char* p = skip_over_field_name(signature + 1, true, --length); 4454 4455 // The next character better be a semicolon 4456 if (p && (p - signature) > 1 && p[0] == ';') { 4457 return p + 1; 4458 } 4459 } else { 4460 // 4900761: For class version > 48, any unicode is allowed in class name. 4461 length--; 4462 signature++; 4463 while (length > 0 && signature[0] != ';') { 4464 if (signature[0] == '.') { 4465 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 4466 } 4467 length--; 4468 signature++; 4469 } 4470 if (signature[0] == ';') { return signature + 1; } 4471 } 4472 4473 return NULL; 4474 } 4475 case JVM_SIGNATURE_ARRAY: 4476 array_dim++; 4477 if (array_dim > 255) { 4478 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 4479 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 4480 } 4481 // The rest of what's there better be a legal signature 4482 signature++; 4483 length--; 4484 void_ok = false; 4485 break; 4486 4487 default: 4488 return NULL; 4489 } 4490 } 4491 return NULL; 4492 }