1/* 2 * Copyright (c) 1997, 2017, 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#include "precompiled.hpp" 25#include "aot/aotLoader.hpp" 26#include "classfile/classFileParser.hpp" 27#include "classfile/classFileStream.hpp" 28#include "classfile/classLoader.hpp" 29#include "classfile/classLoaderData.inline.hpp" 30#include "classfile/defaultMethods.hpp" 31#include "classfile/dictionary.hpp" 32#include "classfile/javaClasses.inline.hpp" 33#include "classfile/moduleEntry.hpp" 34#include "classfile/symbolTable.hpp" 35#include "classfile/systemDictionary.hpp" 36#include "classfile/verificationType.hpp" 37#include "classfile/verifier.hpp" 38#include "classfile/vmSymbols.hpp" 39#include "gc/shared/gcLocker.hpp" 40#include "logging/log.hpp" 41#include "memory/allocation.hpp" 42#include "memory/metadataFactory.hpp" 43#include "memory/oopFactory.hpp" 44#include "memory/resourceArea.hpp" 45#include "memory/universe.inline.hpp" 46#include "oops/annotations.hpp" 47#include "oops/fieldStreams.hpp" 48#include "oops/instanceKlass.hpp" 49#include "oops/instanceMirrorKlass.hpp" 50#include "oops/klass.inline.hpp" 51#include "oops/klassVtable.hpp" 52#include "oops/metadata.hpp" 53#include "oops/method.hpp" 54#include "oops/oop.inline.hpp" 55#include "oops/symbol.hpp" 56#include "prims/jvm.h" 57#include "prims/jvmtiExport.hpp" 58#include "prims/jvmtiThreadState.hpp" 59#include "runtime/javaCalls.hpp" 60#include "runtime/perfData.hpp" 61#include "runtime/reflection.hpp" 62#include "runtime/signature.hpp" 63#include "runtime/timer.hpp" 64#include "services/classLoadingService.hpp" 65#include "services/threadService.hpp" 66#include "trace/traceMacros.hpp" 67#include "utilities/array.hpp" 68#include "utilities/exceptions.hpp" 69#include "utilities/globalDefinitions.hpp" 70#include "utilities/macros.hpp" 71#include "utilities/ostream.hpp" 72#include "utilities/resourceHash.hpp" 73#if INCLUDE_CDS 74#include "classfile/systemDictionaryShared.hpp" 75#endif 76 77// We generally try to create the oops directly when parsing, rather than 78// allocating temporary data structures and copying the bytes twice. A 79// temporary area is only needed when parsing utf8 entries in the constant 80// pool and when parsing line number tables. 81 82// We add assert in debug mode when class format is not checked. 83 84#define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 85#define JAVA_MIN_SUPPORTED_VERSION 45 86#define JAVA_MAX_SUPPORTED_VERSION 53 87#define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 88 89// Used for two backward compatibility reasons: 90// - to check for new additions to the class file format in JDK1.5 91// - to check for bug fixes in the format checker in JDK1.5 92#define JAVA_1_5_VERSION 49 93 94// Used for backward compatibility reasons: 95// - to check for javac bug fixes that happened after 1.5 96// - also used as the max version when running in jdk6 97#define JAVA_6_VERSION 50 98 99// Used for backward compatibility reasons: 100// - to disallow argument and require ACC_STATIC for <clinit> methods 101#define JAVA_7_VERSION 51 102 103// Extension method support. 104#define JAVA_8_VERSION 52 105 106#define JAVA_9_VERSION 53 107 108void ClassFileParser::set_class_bad_constant_seen(short bad_constant) { 109 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION, 110 "Unexpected bad constant pool entry"); 111 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant; 112} 113 114void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream, 115 ConstantPool* cp, 116 const int length, 117 TRAPS) { 118 assert(stream != NULL, "invariant"); 119 assert(cp != NULL, "invariant"); 120 121 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 122 // this function (_current can be allocated in a register, with scalar 123 // replacement of aggregates). The _current pointer is copied back to 124 // stream() when this function returns. DON'T call another method within 125 // this method that uses stream(). 126 const ClassFileStream cfs1 = *stream; 127 const ClassFileStream* const cfs = &cfs1; 128 129 assert(cfs->allocated_on_stack(), "should be local"); 130 debug_only(const u1* const old_current = stream->current();) 131 132 // Used for batching symbol allocations. 133 const char* names[SymbolTable::symbol_alloc_batch_size]; 134 int lengths[SymbolTable::symbol_alloc_batch_size]; 135 int indices[SymbolTable::symbol_alloc_batch_size]; 136 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 137 int names_count = 0; 138 139 // parsing Index 0 is unused 140 for (int index = 1; index < length; index++) { 141 // Each of the following case guarantees one more byte in the stream 142 // for the following tag or the access_flags following constant pool, 143 // so we don't need bounds-check for reading tag. 144 const u1 tag = cfs->get_u1_fast(); 145 switch (tag) { 146 case JVM_CONSTANT_Class : { 147 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 148 const u2 name_index = cfs->get_u2_fast(); 149 cp->klass_index_at_put(index, name_index); 150 break; 151 } 152 case JVM_CONSTANT_Fieldref: { 153 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 154 const u2 class_index = cfs->get_u2_fast(); 155 const u2 name_and_type_index = cfs->get_u2_fast(); 156 cp->field_at_put(index, class_index, name_and_type_index); 157 break; 158 } 159 case JVM_CONSTANT_Methodref: { 160 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 161 const u2 class_index = cfs->get_u2_fast(); 162 const u2 name_and_type_index = cfs->get_u2_fast(); 163 cp->method_at_put(index, class_index, name_and_type_index); 164 break; 165 } 166 case JVM_CONSTANT_InterfaceMethodref: { 167 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 168 const u2 class_index = cfs->get_u2_fast(); 169 const u2 name_and_type_index = cfs->get_u2_fast(); 170 cp->interface_method_at_put(index, class_index, name_and_type_index); 171 break; 172 } 173 case JVM_CONSTANT_String : { 174 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 175 const u2 string_index = cfs->get_u2_fast(); 176 cp->string_index_at_put(index, string_index); 177 break; 178 } 179 case JVM_CONSTANT_MethodHandle : 180 case JVM_CONSTANT_MethodType: { 181 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 182 classfile_parse_error( 183 "Class file version does not support constant tag %u in class file %s", 184 tag, CHECK); 185 } 186 if (tag == JVM_CONSTANT_MethodHandle) { 187 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 188 const u1 ref_kind = cfs->get_u1_fast(); 189 const u2 method_index = cfs->get_u2_fast(); 190 cp->method_handle_index_at_put(index, ref_kind, method_index); 191 } 192 else if (tag == JVM_CONSTANT_MethodType) { 193 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 194 const u2 signature_index = cfs->get_u2_fast(); 195 cp->method_type_index_at_put(index, signature_index); 196 } 197 else { 198 ShouldNotReachHere(); 199 } 200 break; 201 } 202 case JVM_CONSTANT_InvokeDynamic : { 203 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 204 classfile_parse_error( 205 "Class file version does not support constant tag %u in class file %s", 206 tag, CHECK); 207 } 208 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 209 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 210 const u2 name_and_type_index = cfs->get_u2_fast(); 211 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 212 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 213 } 214 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 215 break; 216 } 217 case JVM_CONSTANT_Integer: { 218 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 219 const u4 bytes = cfs->get_u4_fast(); 220 cp->int_at_put(index, (jint)bytes); 221 break; 222 } 223 case JVM_CONSTANT_Float: { 224 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 225 const u4 bytes = cfs->get_u4_fast(); 226 cp->float_at_put(index, *(jfloat*)&bytes); 227 break; 228 } 229 case JVM_CONSTANT_Long: { 230 // A mangled type might cause you to overrun allocated memory 231 guarantee_property(index + 1 < length, 232 "Invalid constant pool entry %u in class file %s", 233 index, 234 CHECK); 235 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 236 const u8 bytes = cfs->get_u8_fast(); 237 cp->long_at_put(index, bytes); 238 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 239 break; 240 } 241 case JVM_CONSTANT_Double: { 242 // A mangled type might cause you to overrun allocated memory 243 guarantee_property(index+1 < length, 244 "Invalid constant pool entry %u in class file %s", 245 index, 246 CHECK); 247 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 248 const u8 bytes = cfs->get_u8_fast(); 249 cp->double_at_put(index, *(jdouble*)&bytes); 250 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 251 break; 252 } 253 case JVM_CONSTANT_NameAndType: { 254 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 255 const u2 name_index = cfs->get_u2_fast(); 256 const u2 signature_index = cfs->get_u2_fast(); 257 cp->name_and_type_at_put(index, name_index, signature_index); 258 break; 259 } 260 case JVM_CONSTANT_Utf8 : { 261 cfs->guarantee_more(2, CHECK); // utf8_length 262 u2 utf8_length = cfs->get_u2_fast(); 263 const u1* utf8_buffer = cfs->get_u1_buffer(); 264 assert(utf8_buffer != NULL, "null utf8 buffer"); 265 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 266 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 267 cfs->skip_u1_fast(utf8_length); 268 269 // Before storing the symbol, make sure it's legal 270 if (_need_verify) { 271 verify_legal_utf8(utf8_buffer, utf8_length, CHECK); 272 } 273 274 if (has_cp_patch_at(index)) { 275 Handle patch = clear_cp_patch_at(index); 276 guarantee_property(java_lang_String::is_instance(patch()), 277 "Illegal utf8 patch at %d in class file %s", 278 index, 279 CHECK); 280 const char* const str = java_lang_String::as_utf8_string(patch()); 281 // (could use java_lang_String::as_symbol instead, but might as well batch them) 282 utf8_buffer = (const u1*) str; 283 utf8_length = (int) strlen(str); 284 } 285 286 unsigned int hash; 287 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer, 288 utf8_length, 289 hash); 290 if (result == NULL) { 291 names[names_count] = (const char*)utf8_buffer; 292 lengths[names_count] = utf8_length; 293 indices[names_count] = index; 294 hashValues[names_count++] = hash; 295 if (names_count == SymbolTable::symbol_alloc_batch_size) { 296 SymbolTable::new_symbols(_loader_data, 297 cp, 298 names_count, 299 names, 300 lengths, 301 indices, 302 hashValues, 303 CHECK); 304 names_count = 0; 305 } 306 } else { 307 cp->symbol_at_put(index, result); 308 } 309 break; 310 } 311 case 19: 312 case 20: { 313 // Record that an error occurred in these two cases but keep parsing so 314 // that ACC_Module can be checked for in the access_flags. Need to 315 // throw NoClassDefFoundError in that case. 316 if (_major_version >= JAVA_9_VERSION) { 317 cfs->guarantee_more(3, CHECK); 318 cfs->get_u2_fast(); 319 set_class_bad_constant_seen(tag); 320 break; 321 } 322 } 323 default: { 324 classfile_parse_error("Unknown constant tag %u in class file %s", 325 tag, 326 CHECK); 327 break; 328 } 329 } // end of switch(tag) 330 } // end of for 331 332 // Allocate the remaining symbols 333 if (names_count > 0) { 334 SymbolTable::new_symbols(_loader_data, 335 cp, 336 names_count, 337 names, 338 lengths, 339 indices, 340 hashValues, 341 CHECK); 342 } 343 344 // Copy _current pointer of local copy back to stream. 345 assert(stream->current() == old_current, "non-exclusive use of stream"); 346 stream->set_current(cfs1.current()); 347 348} 349 350static inline bool valid_cp_range(int index, int length) { 351 return (index > 0 && index < length); 352} 353 354static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) { 355 assert(cp != NULL, "invariant"); 356 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) { 357 return cp->symbol_at(index); 358 } 359 return NULL; 360} 361 362#ifdef ASSERT 363PRAGMA_DIAG_PUSH 364PRAGMA_FORMAT_NONLITERAL_IGNORED 365void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const { 366 ResourceMark rm(THREAD); 367 fatal(msg, _class_name->as_C_string()); 368} 369 370void ClassFileParser::report_assert_property_failure(const char* msg, 371 int index, 372 TRAPS) const { 373 ResourceMark rm(THREAD); 374 fatal(msg, index, _class_name->as_C_string()); 375} 376PRAGMA_DIAG_POP 377#endif 378 379void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream, 380 ConstantPool* const cp, 381 const int length, 382 TRAPS) { 383 assert(cp != NULL, "invariant"); 384 assert(stream != NULL, "invariant"); 385 386 // parsing constant pool entries 387 parse_constant_pool_entries(stream, cp, length, CHECK); 388 if (class_bad_constant_seen() != 0) { 389 // a bad CP entry has been detected previously so stop parsing and just return. 390 return; 391 } 392 393 int index = 1; // declared outside of loops for portability 394 395 // first verification pass - validate cross references 396 // and fixup class and string constants 397 for (index = 1; index < length; index++) { // Index 0 is unused 398 const jbyte tag = cp->tag_at(index).value(); 399 switch (tag) { 400 case JVM_CONSTANT_Class: { 401 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 402 break; 403 } 404 case JVM_CONSTANT_Fieldref: 405 // fall through 406 case JVM_CONSTANT_Methodref: 407 // fall through 408 case JVM_CONSTANT_InterfaceMethodref: { 409 if (!_need_verify) break; 410 const int klass_ref_index = cp->klass_ref_index_at(index); 411 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 412 check_property(valid_klass_reference_at(klass_ref_index), 413 "Invalid constant pool index %u in class file %s", 414 klass_ref_index, CHECK); 415 check_property(valid_cp_range(name_and_type_ref_index, length) && 416 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 417 "Invalid constant pool index %u in class file %s", 418 name_and_type_ref_index, CHECK); 419 break; 420 } 421 case JVM_CONSTANT_String: { 422 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 423 break; 424 } 425 case JVM_CONSTANT_Integer: 426 break; 427 case JVM_CONSTANT_Float: 428 break; 429 case JVM_CONSTANT_Long: 430 case JVM_CONSTANT_Double: { 431 index++; 432 check_property( 433 (index < length && cp->tag_at(index).is_invalid()), 434 "Improper constant pool long/double index %u in class file %s", 435 index, CHECK); 436 break; 437 } 438 case JVM_CONSTANT_NameAndType: { 439 if (!_need_verify) break; 440 const int name_ref_index = cp->name_ref_index_at(index); 441 const int signature_ref_index = cp->signature_ref_index_at(index); 442 check_property(valid_symbol_at(name_ref_index), 443 "Invalid constant pool index %u in class file %s", 444 name_ref_index, CHECK); 445 check_property(valid_symbol_at(signature_ref_index), 446 "Invalid constant pool index %u in class file %s", 447 signature_ref_index, CHECK); 448 break; 449 } 450 case JVM_CONSTANT_Utf8: 451 break; 452 case JVM_CONSTANT_UnresolvedClass: // fall-through 453 case JVM_CONSTANT_UnresolvedClassInError: { 454 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 455 break; 456 } 457 case JVM_CONSTANT_ClassIndex: { 458 const int class_index = cp->klass_index_at(index); 459 check_property(valid_symbol_at(class_index), 460 "Invalid constant pool index %u in class file %s", 461 class_index, CHECK); 462 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 463 break; 464 } 465 case JVM_CONSTANT_StringIndex: { 466 const int string_index = cp->string_index_at(index); 467 check_property(valid_symbol_at(string_index), 468 "Invalid constant pool index %u in class file %s", 469 string_index, CHECK); 470 Symbol* const sym = cp->symbol_at(string_index); 471 cp->unresolved_string_at_put(index, sym); 472 break; 473 } 474 case JVM_CONSTANT_MethodHandle: { 475 const int ref_index = cp->method_handle_index_at(index); 476 check_property(valid_cp_range(ref_index, length), 477 "Invalid constant pool index %u in class file %s", 478 ref_index, CHECK); 479 const constantTag tag = cp->tag_at(ref_index); 480 const int ref_kind = cp->method_handle_ref_kind_at(index); 481 482 switch (ref_kind) { 483 case JVM_REF_getField: 484 case JVM_REF_getStatic: 485 case JVM_REF_putField: 486 case JVM_REF_putStatic: { 487 check_property( 488 tag.is_field(), 489 "Invalid constant pool index %u in class file %s (not a field)", 490 ref_index, CHECK); 491 break; 492 } 493 case JVM_REF_invokeVirtual: 494 case JVM_REF_newInvokeSpecial: { 495 check_property( 496 tag.is_method(), 497 "Invalid constant pool index %u in class file %s (not a method)", 498 ref_index, CHECK); 499 break; 500 } 501 case JVM_REF_invokeStatic: 502 case JVM_REF_invokeSpecial: { 503 check_property( 504 tag.is_method() || 505 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 506 "Invalid constant pool index %u in class file %s (not a method)", 507 ref_index, CHECK); 508 break; 509 } 510 case JVM_REF_invokeInterface: { 511 check_property( 512 tag.is_interface_method(), 513 "Invalid constant pool index %u in class file %s (not an interface method)", 514 ref_index, CHECK); 515 break; 516 } 517 default: { 518 classfile_parse_error( 519 "Bad method handle kind at constant pool index %u in class file %s", 520 index, CHECK); 521 } 522 } // switch(refkind) 523 // Keep the ref_index unchanged. It will be indirected at link-time. 524 break; 525 } // case MethodHandle 526 case JVM_CONSTANT_MethodType: { 527 const int ref_index = cp->method_type_index_at(index); 528 check_property(valid_symbol_at(ref_index), 529 "Invalid constant pool index %u in class file %s", 530 ref_index, CHECK); 531 break; 532 } 533 case JVM_CONSTANT_InvokeDynamic: { 534 const int name_and_type_ref_index = 535 cp->invoke_dynamic_name_and_type_ref_index_at(index); 536 537 check_property(valid_cp_range(name_and_type_ref_index, length) && 538 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 539 "Invalid constant pool index %u in class file %s", 540 name_and_type_ref_index, CHECK); 541 // bootstrap specifier index must be checked later, 542 // when BootstrapMethods attr is available 543 break; 544 } 545 default: { 546 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 547 ShouldNotReachHere(); 548 break; 549 } 550 } // switch(tag) 551 } // end of for 552 553 if (_cp_patches != NULL) { 554 // need to treat this_class specially... 555 int this_class_index; 556 { 557 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 558 const u1* const mark = stream->current(); 559 stream->skip_u2_fast(1); // skip flags 560 this_class_index = stream->get_u2_fast(); 561 stream->set_current(mark); // revert to mark 562 } 563 564 for (index = 1; index < length; index++) { // Index 0 is unused 565 if (has_cp_patch_at(index)) { 566 guarantee_property(index != this_class_index, 567 "Illegal constant pool patch to self at %d in class file %s", 568 index, CHECK); 569 patch_constant_pool(cp, index, cp_patch_at(index), CHECK); 570 } 571 } 572 } 573 574 if (!_need_verify) { 575 return; 576 } 577 578 // second verification pass - checks the strings are of the right format. 579 // but not yet to the other entries 580 for (index = 1; index < length; index++) { 581 const jbyte tag = cp->tag_at(index).value(); 582 switch (tag) { 583 case JVM_CONSTANT_UnresolvedClass: { 584 const Symbol* const class_name = cp->klass_name_at(index); 585 // check the name, even if _cp_patches will overwrite it 586 verify_legal_class_name(class_name, CHECK); 587 break; 588 } 589 case JVM_CONSTANT_NameAndType: { 590 if (_need_verify) { 591 const int sig_index = cp->signature_ref_index_at(index); 592 const int name_index = cp->name_ref_index_at(index); 593 const Symbol* const name = cp->symbol_at(name_index); 594 const Symbol* const sig = cp->symbol_at(sig_index); 595 guarantee_property(sig->utf8_length() != 0, 596 "Illegal zero length constant pool entry at %d in class %s", 597 sig_index, CHECK); 598 guarantee_property(name->utf8_length() != 0, 599 "Illegal zero length constant pool entry at %d in class %s", 600 name_index, CHECK); 601 602 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 603 // Format check method name and signature 604 verify_legal_method_name(name, CHECK); 605 verify_legal_method_signature(name, sig, CHECK); 606 } else { 607 // Format check field name and signature 608 verify_legal_field_name(name, CHECK); 609 verify_legal_field_signature(name, sig, CHECK); 610 } 611 } 612 break; 613 } 614 case JVM_CONSTANT_InvokeDynamic: 615 case JVM_CONSTANT_Fieldref: 616 case JVM_CONSTANT_Methodref: 617 case JVM_CONSTANT_InterfaceMethodref: { 618 const int name_and_type_ref_index = 619 cp->name_and_type_ref_index_at(index); 620 // already verified to be utf8 621 const int name_ref_index = 622 cp->name_ref_index_at(name_and_type_ref_index); 623 // already verified to be utf8 624 const int signature_ref_index = 625 cp->signature_ref_index_at(name_and_type_ref_index); 626 const Symbol* const name = cp->symbol_at(name_ref_index); 627 const Symbol* const signature = cp->symbol_at(signature_ref_index); 628 if (tag == JVM_CONSTANT_Fieldref) { 629 if (_need_verify) { 630 // Field name and signature are verified above, when iterating NameAndType_info. 631 // Need only to be sure signature is non-zero length and the right type. 632 if (signature->utf8_length() == 0 || 633 signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 634 throwIllegalSignature("Field", name, signature, CHECK); 635 } 636 } 637 } else { 638 if (_need_verify) { 639 // Method name and signature are verified above, when iterating NameAndType_info. 640 // Need only to be sure signature is non-zero length and the right type. 641 if (signature->utf8_length() == 0 || 642 signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 643 throwIllegalSignature("Method", name, signature, CHECK); 644 } 645 } 646 // 4509014: If a class method name begins with '<', it must be "<init>" 647 const unsigned int name_len = name->utf8_length(); 648 if (tag == JVM_CONSTANT_Methodref && 649 name_len != 0 && 650 name->byte_at(0) == '<' && 651 name != vmSymbols::object_initializer_name()) { 652 classfile_parse_error( 653 "Bad method name at constant pool index %u in class file %s", 654 name_ref_index, CHECK); 655 } 656 } 657 break; 658 } 659 case JVM_CONSTANT_MethodHandle: { 660 const int ref_index = cp->method_handle_index_at(index); 661 const int ref_kind = cp->method_handle_ref_kind_at(index); 662 switch (ref_kind) { 663 case JVM_REF_invokeVirtual: 664 case JVM_REF_invokeStatic: 665 case JVM_REF_invokeSpecial: 666 case JVM_REF_newInvokeSpecial: { 667 const int name_and_type_ref_index = 668 cp->name_and_type_ref_index_at(ref_index); 669 const int name_ref_index = 670 cp->name_ref_index_at(name_and_type_ref_index); 671 const Symbol* const name = cp->symbol_at(name_ref_index); 672 if (ref_kind == JVM_REF_newInvokeSpecial) { 673 if (name != vmSymbols::object_initializer_name()) { 674 classfile_parse_error( 675 "Bad constructor name at constant pool index %u in class file %s", 676 name_ref_index, CHECK); 677 } 678 } else { 679 if (name == vmSymbols::object_initializer_name()) { 680 classfile_parse_error( 681 "Bad method name at constant pool index %u in class file %s", 682 name_ref_index, CHECK); 683 } 684 } 685 break; 686 } 687 // Other ref_kinds are already fully checked in previous pass. 688 } // switch(ref_kind) 689 break; 690 } 691 case JVM_CONSTANT_MethodType: { 692 const Symbol* const no_name = vmSymbols::type_name(); // place holder 693 const Symbol* const signature = cp->method_type_signature_at(index); 694 verify_legal_method_signature(no_name, signature, CHECK); 695 break; 696 } 697 case JVM_CONSTANT_Utf8: { 698 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 699 } 700 } // switch(tag) 701 } // end of for 702} 703 704void ClassFileParser::patch_constant_pool(ConstantPool* cp, 705 int index, 706 Handle patch, 707 TRAPS) { 708 assert(cp != NULL, "invariant"); 709 710 BasicType patch_type = T_VOID; 711 712 switch (cp->tag_at(index).value()) { 713 714 case JVM_CONSTANT_UnresolvedClass: { 715 // Patching a class means pre-resolving it. 716 // The name in the constant pool is ignored. 717 if (java_lang_Class::is_instance(patch())) { 718 guarantee_property(!java_lang_Class::is_primitive(patch()), 719 "Illegal class patch at %d in class file %s", 720 index, CHECK); 721 cp->klass_at_put(index, java_lang_Class::as_Klass(patch())); 722 } else { 723 guarantee_property(java_lang_String::is_instance(patch()), 724 "Illegal class patch at %d in class file %s", 725 index, CHECK); 726 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK); 727 cp->unresolved_klass_at_put(index, name); 728 } 729 break; 730 } 731 732 case JVM_CONSTANT_String: { 733 // skip this patch and don't clear it. Needs the oop array for resolved 734 // references to be created first. 735 return; 736 } 737 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim; 738 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim; 739 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim; 740 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim; 741 patch_prim: 742 { 743 jvalue value; 744 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 745 guarantee_property(value_type == patch_type, 746 "Illegal primitive patch at %d in class file %s", 747 index, CHECK); 748 switch (value_type) { 749 case T_INT: cp->int_at_put(index, value.i); break; 750 case T_FLOAT: cp->float_at_put(index, value.f); break; 751 case T_LONG: cp->long_at_put(index, value.j); break; 752 case T_DOUBLE: cp->double_at_put(index, value.d); break; 753 default: assert(false, ""); 754 } 755 } // end patch_prim label 756 break; 757 758 default: { 759 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 760 guarantee_property(!has_cp_patch_at(index), 761 "Illegal unexpected patch at %d in class file %s", 762 index, CHECK); 763 return; 764 } 765 } // end of switch(tag) 766 767 // On fall-through, mark the patch as used. 768 clear_cp_patch_at(index); 769} 770class NameSigHash: public ResourceObj { 771 public: 772 const Symbol* _name; // name 773 const Symbol* _sig; // signature 774 NameSigHash* _next; // Next entry in hash table 775}; 776 777static const int HASH_ROW_SIZE = 256; 778 779static unsigned int hash(const Symbol* name, const Symbol* sig) { 780 unsigned int raw_hash = 0; 781 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 782 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 783 784 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 785} 786 787 788static void initialize_hashtable(NameSigHash** table) { 789 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 790} 791// Return false if the name/sig combination is found in table. 792// Return true if no duplicate is found. And name/sig is added as a new entry in table. 793// The old format checker uses heap sort to find duplicates. 794// NOTE: caller should guarantee that GC doesn't happen during the life cycle 795// of table since we don't expect Symbol*'s to move. 796static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) { 797 assert(name != NULL, "name in constant pool is NULL"); 798 799 // First lookup for duplicates 800 int index = hash(name, sig); 801 NameSigHash* entry = table[index]; 802 while (entry != NULL) { 803 if (entry->_name == name && entry->_sig == sig) { 804 return false; 805 } 806 entry = entry->_next; 807 } 808 809 // No duplicate is found, allocate a new entry and fill it. 810 entry = new NameSigHash(); 811 entry->_name = name; 812 entry->_sig = sig; 813 814 // Insert into hash table 815 entry->_next = table[index]; 816 table[index] = entry; 817 818 return true; 819} 820 821// Side-effects: populates the _local_interfaces field 822void ClassFileParser::parse_interfaces(const ClassFileStream* const stream, 823 const int itfs_len, 824 ConstantPool* const cp, 825 bool* const has_nonstatic_concrete_methods, 826 TRAPS) { 827 assert(stream != NULL, "invariant"); 828 assert(cp != NULL, "invariant"); 829 assert(has_nonstatic_concrete_methods != NULL, "invariant"); 830 831 if (itfs_len == 0) { 832 _local_interfaces = Universe::the_empty_klass_array(); 833 } else { 834 assert(itfs_len > 0, "only called for len>0"); 835 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK); 836 837 int index; 838 for (index = 0; index < itfs_len; index++) { 839 const u2 interface_index = stream->get_u2(CHECK); 840 KlassHandle interf; 841 check_property( 842 valid_klass_reference_at(interface_index), 843 "Interface name has bad constant pool index %u in class file %s", 844 interface_index, CHECK); 845 if (cp->tag_at(interface_index).is_klass()) { 846 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index)); 847 } else { 848 Symbol* const unresolved_klass = cp->klass_name_at(interface_index); 849 850 // Don't need to check legal name because it's checked when parsing constant pool. 851 // But need to make sure it's not an array type. 852 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 853 "Bad interface name in class file %s", CHECK); 854 855 // Call resolve_super so classcircularity is checked 856 const Klass* const k = 857 SystemDictionary::resolve_super_or_fail(_class_name, 858 unresolved_klass, 859 _loader_data->class_loader(), 860 _protection_domain, 861 false, 862 CHECK); 863 interf = KlassHandle(THREAD, k); 864 } 865 866 if (!interf()->is_interface()) { 867 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 868 "Implementing class"); 869 } 870 871 if (InstanceKlass::cast(interf())->has_nonstatic_concrete_methods()) { 872 *has_nonstatic_concrete_methods = true; 873 } 874 _local_interfaces->at_put(index, interf()); 875 } 876 877 if (!_need_verify || itfs_len <= 1) { 878 return; 879 } 880 881 // Check if there's any duplicates in interfaces 882 ResourceMark rm(THREAD); 883 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 884 NameSigHash*, 885 HASH_ROW_SIZE); 886 initialize_hashtable(interface_names); 887 bool dup = false; 888 { 889 debug_only(NoSafepointVerifier nsv;) 890 for (index = 0; index < itfs_len; index++) { 891 const Klass* const k = _local_interfaces->at(index); 892 const Symbol* const name = InstanceKlass::cast(k)->name(); 893 // If no duplicates, add (name, NULL) in hashtable interface_names. 894 if (!put_after_lookup(name, NULL, interface_names)) { 895 dup = true; 896 break; 897 } 898 } 899 } 900 if (dup) { 901 classfile_parse_error("Duplicate interface name in class file %s", CHECK); 902 } 903 } 904} 905 906void ClassFileParser::verify_constantvalue(const ConstantPool* const cp, 907 int constantvalue_index, 908 int signature_index, 909 TRAPS) const { 910 // Make sure the constant pool entry is of a type appropriate to this field 911 guarantee_property( 912 (constantvalue_index > 0 && 913 constantvalue_index < cp->length()), 914 "Bad initial value index %u in ConstantValue attribute in class file %s", 915 constantvalue_index, CHECK); 916 917 const constantTag value_type = cp->tag_at(constantvalue_index); 918 switch(cp->basic_type_for_signature_at(signature_index)) { 919 case T_LONG: { 920 guarantee_property(value_type.is_long(), 921 "Inconsistent constant value type in class file %s", 922 CHECK); 923 break; 924 } 925 case T_FLOAT: { 926 guarantee_property(value_type.is_float(), 927 "Inconsistent constant value type in class file %s", 928 CHECK); 929 break; 930 } 931 case T_DOUBLE: { 932 guarantee_property(value_type.is_double(), 933 "Inconsistent constant value type in class file %s", 934 CHECK); 935 break; 936 } 937 case T_BYTE: 938 case T_CHAR: 939 case T_SHORT: 940 case T_BOOLEAN: 941 case T_INT: { 942 guarantee_property(value_type.is_int(), 943 "Inconsistent constant value type in class file %s", 944 CHECK); 945 break; 946 } 947 case T_OBJECT: { 948 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 949 && value_type.is_string()), 950 "Bad string initial value in class file %s", 951 CHECK); 952 break; 953 } 954 default: { 955 classfile_parse_error("Unable to set initial value %u in class file %s", 956 constantvalue_index, 957 CHECK); 958 } 959 } 960} 961 962class AnnotationCollector : public ResourceObj{ 963public: 964 enum Location { _in_field, _in_method, _in_class }; 965 enum ID { 966 _unknown = 0, 967 _method_CallerSensitive, 968 _method_ForceInline, 969 _method_DontInline, 970 _method_InjectedProfile, 971 _method_LambdaForm_Compiled, 972 _method_LambdaForm_Hidden, 973 _method_HotSpotIntrinsicCandidate, 974 _jdk_internal_vm_annotation_Contended, 975 _field_Stable, 976 _jdk_internal_vm_annotation_ReservedStackAccess, 977 _annotation_LIMIT 978 }; 979 const Location _location; 980 int _annotations_present; 981 u2 _contended_group; 982 983 AnnotationCollector(Location location) 984 : _location(location), _annotations_present(0) 985 { 986 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); 987 } 988 // If this annotation name has an ID, report it (or _none). 989 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name); 990 // Set the annotation name: 991 void set_annotation(ID id) { 992 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 993 _annotations_present |= nth_bit((int)id); 994 } 995 996 void remove_annotation(ID id) { 997 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 998 _annotations_present &= ~nth_bit((int)id); 999 } 1000 1001 // Report if the annotation is present. 1002 bool has_any_annotations() const { return _annotations_present != 0; } 1003 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; } 1004 1005 void set_contended_group(u2 group) { _contended_group = group; } 1006 u2 contended_group() const { return _contended_group; } 1007 1008 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); } 1009 1010 void set_stable(bool stable) { set_annotation(_field_Stable); } 1011 bool is_stable() const { return has_annotation(_field_Stable); } 1012}; 1013 1014// This class also doubles as a holder for metadata cleanup. 1015class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector { 1016private: 1017 ClassLoaderData* _loader_data; 1018 AnnotationArray* _field_annotations; 1019 AnnotationArray* _field_type_annotations; 1020public: 1021 FieldAnnotationCollector(ClassLoaderData* loader_data) : 1022 AnnotationCollector(_in_field), 1023 _loader_data(loader_data), 1024 _field_annotations(NULL), 1025 _field_type_annotations(NULL) {} 1026 ~FieldAnnotationCollector(); 1027 void apply_to(FieldInfo* f); 1028 AnnotationArray* field_annotations() { return _field_annotations; } 1029 AnnotationArray* field_type_annotations() { return _field_type_annotations; } 1030 1031 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; } 1032 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; } 1033}; 1034 1035class MethodAnnotationCollector : public AnnotationCollector{ 1036public: 1037 MethodAnnotationCollector() : AnnotationCollector(_in_method) { } 1038 void apply_to(methodHandle m); 1039}; 1040 1041class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{ 1042public: 1043 ClassAnnotationCollector() : AnnotationCollector(_in_class) { } 1044 void apply_to(InstanceKlass* ik); 1045}; 1046 1047 1048static int skip_annotation_value(const u1*, int, int); // fwd decl 1049 1050// Safely increment index by val if does not pass limit 1051#define SAFE_ADD(index, limit, val) \ 1052if (index >= limit - val) return limit; \ 1053index += val; 1054 1055// Skip an annotation. Return >=limit if there is any problem. 1056static int skip_annotation(const u1* buffer, int limit, int index) { 1057 assert(buffer != NULL, "invariant"); 1058 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1059 // value := switch (tag:u1) { ... } 1060 SAFE_ADD(index, limit, 4); // skip atype and read nmem 1061 int nmem = Bytes::get_Java_u2((address)buffer + index - 2); 1062 while (--nmem >= 0 && index < limit) { 1063 SAFE_ADD(index, limit, 2); // skip member 1064 index = skip_annotation_value(buffer, limit, index); 1065 } 1066 return index; 1067} 1068 1069// Skip an annotation value. Return >=limit if there is any problem. 1070static int skip_annotation_value(const u1* buffer, int limit, int index) { 1071 assert(buffer != NULL, "invariant"); 1072 1073 // value := switch (tag:u1) { 1074 // case B, C, I, S, Z, D, F, J, c: con:u2; 1075 // case e: e_class:u2 e_name:u2; 1076 // case s: s_con:u2; 1077 // case [: do(nval:u2) {value}; 1078 // case @: annotation; 1079 // case s: s_con:u2; 1080 // } 1081 SAFE_ADD(index, limit, 1); // read tag 1082 const u1 tag = buffer[index - 1]; 1083 switch (tag) { 1084 case 'B': 1085 case 'C': 1086 case 'I': 1087 case 'S': 1088 case 'Z': 1089 case 'D': 1090 case 'F': 1091 case 'J': 1092 case 'c': 1093 case 's': 1094 SAFE_ADD(index, limit, 2); // skip con or s_con 1095 break; 1096 case 'e': 1097 SAFE_ADD(index, limit, 4); // skip e_class, e_name 1098 break; 1099 case '[': 1100 { 1101 SAFE_ADD(index, limit, 2); // read nval 1102 int nval = Bytes::get_Java_u2((address)buffer + index - 2); 1103 while (--nval >= 0 && index < limit) { 1104 index = skip_annotation_value(buffer, limit, index); 1105 } 1106 } 1107 break; 1108 case '@': 1109 index = skip_annotation(buffer, limit, index); 1110 break; 1111 default: 1112 return limit; // bad tag byte 1113 } 1114 return index; 1115} 1116 1117// Sift through annotations, looking for those significant to the VM: 1118static void parse_annotations(const ConstantPool* const cp, 1119 const u1* buffer, int limit, 1120 AnnotationCollector* coll, 1121 ClassLoaderData* loader_data, 1122 TRAPS) { 1123 1124 assert(cp != NULL, "invariant"); 1125 assert(buffer != NULL, "invariant"); 1126 assert(coll != NULL, "invariant"); 1127 assert(loader_data != NULL, "invariant"); 1128 1129 // annotations := do(nann:u2) {annotation} 1130 int index = 2; // read nann 1131 if (index >= limit) return; 1132 int nann = Bytes::get_Java_u2((address)buffer + index - 2); 1133 enum { // initial annotation layout 1134 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1135 count_off = 2, // u2 such as 1 (one value) 1136 member_off = 4, // utf8 such as 'value' 1137 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1138 e_tag_val = 'e', 1139 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1140 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1141 e_size = 11, // end of 'e' annotation 1142 c_tag_val = 'c', // payload is type 1143 c_con_off = 7, // utf8 payload, such as 'I' 1144 c_size = 9, // end of 'c' annotation 1145 s_tag_val = 's', // payload is String 1146 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1147 s_size = 9, 1148 min_size = 6 // smallest possible size (zero members) 1149 }; 1150 // Cannot add min_size to index in case of overflow MAX_INT 1151 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) { 1152 int index0 = index; 1153 index = skip_annotation(buffer, limit, index); 1154 const u1* const abase = buffer + index0; 1155 const int atype = Bytes::get_Java_u2((address)abase + atype_off); 1156 const int count = Bytes::get_Java_u2((address)abase + count_off); 1157 const Symbol* const aname = check_symbol_at(cp, atype); 1158 if (aname == NULL) break; // invalid annotation name 1159 const Symbol* member = NULL; 1160 if (count >= 1) { 1161 const int member_index = Bytes::get_Java_u2((address)abase + member_off); 1162 member = check_symbol_at(cp, member_index); 1163 if (member == NULL) break; // invalid member name 1164 } 1165 1166 // Here is where parsing particular annotations will take place. 1167 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname); 1168 if (AnnotationCollector::_unknown == id) continue; 1169 coll->set_annotation(id); 1170 1171 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) { 1172 // @Contended can optionally specify the contention group. 1173 // 1174 // Contended group defines the equivalence class over the fields: 1175 // the fields within the same contended group are not treated distinct. 1176 // The only exception is default group, which does not incur the 1177 // equivalence. Naturally, contention group for classes is meaningless. 1178 // 1179 // While the contention group is specified as String, annotation 1180 // values are already interned, and we might as well use the constant 1181 // pool index as the group tag. 1182 // 1183 u2 group_index = 0; // default contended group 1184 if (count == 1 1185 && s_size == (index - index0) // match size 1186 && s_tag_val == *(abase + tag_off) 1187 && member == vmSymbols::value_name()) { 1188 group_index = Bytes::get_Java_u2((address)abase + s_con_off); 1189 if (cp->symbol_at(group_index)->utf8_length() == 0) { 1190 group_index = 0; // default contended group 1191 } 1192 } 1193 coll->set_contended_group(group_index); 1194 } 1195 } 1196} 1197 1198 1199// Parse attributes for a field. 1200void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs, 1201 u2 attributes_count, 1202 bool is_static, u2 signature_index, 1203 u2* const constantvalue_index_addr, 1204 bool* const is_synthetic_addr, 1205 u2* const generic_signature_index_addr, 1206 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 1207 TRAPS) { 1208 assert(cfs != NULL, "invariant"); 1209 assert(constantvalue_index_addr != NULL, "invariant"); 1210 assert(is_synthetic_addr != NULL, "invariant"); 1211 assert(generic_signature_index_addr != NULL, "invariant"); 1212 assert(parsed_annotations != NULL, "invariant"); 1213 assert(attributes_count > 0, "attributes_count should be greater than 0"); 1214 1215 u2 constantvalue_index = 0; 1216 u2 generic_signature_index = 0; 1217 bool is_synthetic = false; 1218 const u1* runtime_visible_annotations = NULL; 1219 int runtime_visible_annotations_length = 0; 1220 const u1* runtime_invisible_annotations = NULL; 1221 int runtime_invisible_annotations_length = 0; 1222 const u1* runtime_visible_type_annotations = NULL; 1223 int runtime_visible_type_annotations_length = 0; 1224 const u1* runtime_invisible_type_annotations = NULL; 1225 int runtime_invisible_type_annotations_length = 0; 1226 bool runtime_invisible_annotations_exists = false; 1227 bool runtime_invisible_type_annotations_exists = false; 1228 const ConstantPool* const cp = _cp; 1229 1230 while (attributes_count--) { 1231 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 1232 const u2 attribute_name_index = cfs->get_u2_fast(); 1233 const u4 attribute_length = cfs->get_u4_fast(); 1234 check_property(valid_symbol_at(attribute_name_index), 1235 "Invalid field attribute index %u in class file %s", 1236 attribute_name_index, 1237 CHECK); 1238 1239 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 1240 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 1241 // ignore if non-static 1242 if (constantvalue_index != 0) { 1243 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 1244 } 1245 check_property( 1246 attribute_length == 2, 1247 "Invalid ConstantValue field attribute length %u in class file %s", 1248 attribute_length, CHECK); 1249 1250 constantvalue_index = cfs->get_u2(CHECK); 1251 if (_need_verify) { 1252 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK); 1253 } 1254 } else if (attribute_name == vmSymbols::tag_synthetic()) { 1255 if (attribute_length != 0) { 1256 classfile_parse_error( 1257 "Invalid Synthetic field attribute length %u in class file %s", 1258 attribute_length, CHECK); 1259 } 1260 is_synthetic = true; 1261 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1262 if (attribute_length != 0) { 1263 classfile_parse_error( 1264 "Invalid Deprecated field attribute length %u in class file %s", 1265 attribute_length, CHECK); 1266 } 1267 } else if (_major_version >= JAVA_1_5_VERSION) { 1268 if (attribute_name == vmSymbols::tag_signature()) { 1269 if (generic_signature_index != 0) { 1270 classfile_parse_error( 1271 "Multiple Signature attributes for field in class file %s", CHECK); 1272 } 1273 if (attribute_length != 2) { 1274 classfile_parse_error( 1275 "Wrong size %u for field's Signature attribute in class file %s", 1276 attribute_length, CHECK); 1277 } 1278 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK); 1279 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1280 if (runtime_visible_annotations != NULL) { 1281 classfile_parse_error( 1282 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 1283 } 1284 runtime_visible_annotations_length = attribute_length; 1285 runtime_visible_annotations = cfs->get_u1_buffer(); 1286 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1287 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 1288 parse_annotations(cp, 1289 runtime_visible_annotations, 1290 runtime_visible_annotations_length, 1291 parsed_annotations, 1292 _loader_data, 1293 CHECK); 1294 cfs->skip_u1_fast(runtime_visible_annotations_length); 1295 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1296 if (runtime_invisible_annotations_exists) { 1297 classfile_parse_error( 1298 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 1299 } 1300 runtime_invisible_annotations_exists = true; 1301 if (PreserveAllAnnotations) { 1302 runtime_invisible_annotations_length = attribute_length; 1303 runtime_invisible_annotations = cfs->get_u1_buffer(); 1304 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1305 } 1306 cfs->skip_u1(attribute_length, CHECK); 1307 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 1308 if (runtime_visible_type_annotations != NULL) { 1309 classfile_parse_error( 1310 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 1311 } 1312 runtime_visible_type_annotations_length = attribute_length; 1313 runtime_visible_type_annotations = cfs->get_u1_buffer(); 1314 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 1315 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 1316 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 1317 if (runtime_invisible_type_annotations_exists) { 1318 classfile_parse_error( 1319 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 1320 } else { 1321 runtime_invisible_type_annotations_exists = true; 1322 } 1323 if (PreserveAllAnnotations) { 1324 runtime_invisible_type_annotations_length = attribute_length; 1325 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 1326 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 1327 } 1328 cfs->skip_u1(attribute_length, CHECK); 1329 } else { 1330 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1331 } 1332 } else { 1333 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1334 } 1335 } 1336 1337 *constantvalue_index_addr = constantvalue_index; 1338 *is_synthetic_addr = is_synthetic; 1339 *generic_signature_index_addr = generic_signature_index; 1340 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 1341 runtime_visible_annotations_length, 1342 runtime_invisible_annotations, 1343 runtime_invisible_annotations_length, 1344 CHECK); 1345 parsed_annotations->set_field_annotations(a); 1346 a = assemble_annotations(runtime_visible_type_annotations, 1347 runtime_visible_type_annotations_length, 1348 runtime_invisible_type_annotations, 1349 runtime_invisible_type_annotations_length, 1350 CHECK); 1351 parsed_annotations->set_field_type_annotations(a); 1352 return; 1353} 1354 1355 1356// Field allocation types. Used for computing field offsets. 1357 1358enum FieldAllocationType { 1359 STATIC_OOP, // Oops 1360 STATIC_BYTE, // Boolean, Byte, char 1361 STATIC_SHORT, // shorts 1362 STATIC_WORD, // ints 1363 STATIC_DOUBLE, // aligned long or double 1364 NONSTATIC_OOP, 1365 NONSTATIC_BYTE, 1366 NONSTATIC_SHORT, 1367 NONSTATIC_WORD, 1368 NONSTATIC_DOUBLE, 1369 MAX_FIELD_ALLOCATION_TYPE, 1370 BAD_ALLOCATION_TYPE = -1 1371}; 1372 1373static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1374 BAD_ALLOCATION_TYPE, // 0 1375 BAD_ALLOCATION_TYPE, // 1 1376 BAD_ALLOCATION_TYPE, // 2 1377 BAD_ALLOCATION_TYPE, // 3 1378 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1379 NONSTATIC_SHORT, // T_CHAR = 5, 1380 NONSTATIC_WORD, // T_FLOAT = 6, 1381 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1382 NONSTATIC_BYTE, // T_BYTE = 8, 1383 NONSTATIC_SHORT, // T_SHORT = 9, 1384 NONSTATIC_WORD, // T_INT = 10, 1385 NONSTATIC_DOUBLE, // T_LONG = 11, 1386 NONSTATIC_OOP, // T_OBJECT = 12, 1387 NONSTATIC_OOP, // T_ARRAY = 13, 1388 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1389 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1390 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1391 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1392 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1393 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1394 BAD_ALLOCATION_TYPE, // 0 1395 BAD_ALLOCATION_TYPE, // 1 1396 BAD_ALLOCATION_TYPE, // 2 1397 BAD_ALLOCATION_TYPE, // 3 1398 STATIC_BYTE , // T_BOOLEAN = 4, 1399 STATIC_SHORT, // T_CHAR = 5, 1400 STATIC_WORD, // T_FLOAT = 6, 1401 STATIC_DOUBLE, // T_DOUBLE = 7, 1402 STATIC_BYTE, // T_BYTE = 8, 1403 STATIC_SHORT, // T_SHORT = 9, 1404 STATIC_WORD, // T_INT = 10, 1405 STATIC_DOUBLE, // T_LONG = 11, 1406 STATIC_OOP, // T_OBJECT = 12, 1407 STATIC_OOP, // T_ARRAY = 13, 1408 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1409 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1410 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1411 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1412 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1413 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1414}; 1415 1416static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1417 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1418 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1419 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1420 return result; 1421} 1422 1423class ClassFileParser::FieldAllocationCount : public ResourceObj { 1424 public: 1425 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1426 1427 FieldAllocationCount() { 1428 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1429 count[i] = 0; 1430 } 1431 } 1432 1433 FieldAllocationType update(bool is_static, BasicType type) { 1434 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1435 if (atype != BAD_ALLOCATION_TYPE) { 1436 // Make sure there is no overflow with injected fields. 1437 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1438 count[atype]++; 1439 } 1440 return atype; 1441 } 1442}; 1443 1444// Side-effects: populates the _fields, _fields_annotations, 1445// _fields_type_annotations fields 1446void ClassFileParser::parse_fields(const ClassFileStream* const cfs, 1447 bool is_interface, 1448 FieldAllocationCount* const fac, 1449 ConstantPool* cp, 1450 const int cp_size, 1451 u2* const java_fields_count_ptr, 1452 TRAPS) { 1453 1454 assert(cfs != NULL, "invariant"); 1455 assert(fac != NULL, "invariant"); 1456 assert(cp != NULL, "invariant"); 1457 assert(java_fields_count_ptr != NULL, "invariant"); 1458 1459 assert(NULL == _fields, "invariant"); 1460 assert(NULL == _fields_annotations, "invariant"); 1461 assert(NULL == _fields_type_annotations, "invariant"); 1462 1463 cfs->guarantee_more(2, CHECK); // length 1464 const u2 length = cfs->get_u2_fast(); 1465 *java_fields_count_ptr = length; 1466 1467 int num_injected = 0; 1468 const InjectedField* const injected = JavaClasses::get_injected(_class_name, 1469 &num_injected); 1470 const int total_fields = length + num_injected; 1471 1472 // The field array starts with tuples of shorts 1473 // [access, name index, sig index, initial value index, byte offset]. 1474 // A generic signature slot only exists for field with generic 1475 // signature attribute. And the access flag is set with 1476 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1477 // signature slots are at the end of the field array and after all 1478 // other fields data. 1479 // 1480 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1481 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1482 // ... 1483 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1484 // [generic signature index] 1485 // [generic signature index] 1486 // ... 1487 // 1488 // Allocate a temporary resource array for field data. For each field, 1489 // a slot is reserved in the temporary array for the generic signature 1490 // index. After parsing all fields, the data are copied to a permanent 1491 // array and any unused slots will be discarded. 1492 ResourceMark rm(THREAD); 1493 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 1494 u2, 1495 total_fields * (FieldInfo::field_slots + 1)); 1496 1497 // The generic signature slots start after all other fields' data. 1498 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1499 int num_generic_signature = 0; 1500 for (int n = 0; n < length; n++) { 1501 // access_flags, name_index, descriptor_index, attributes_count 1502 cfs->guarantee_more(8, CHECK); 1503 1504 AccessFlags access_flags; 1505 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1506 verify_legal_field_modifiers(flags, is_interface, CHECK); 1507 access_flags.set_flags(flags); 1508 1509 const u2 name_index = cfs->get_u2_fast(); 1510 check_property(valid_symbol_at(name_index), 1511 "Invalid constant pool index %u for field name in class file %s", 1512 name_index, CHECK); 1513 const Symbol* const name = cp->symbol_at(name_index); 1514 verify_legal_field_name(name, CHECK); 1515 1516 const u2 signature_index = cfs->get_u2_fast(); 1517 check_property(valid_symbol_at(signature_index), 1518 "Invalid constant pool index %u for field signature in class file %s", 1519 signature_index, CHECK); 1520 const Symbol* const sig = cp->symbol_at(signature_index); 1521 verify_legal_field_signature(name, sig, CHECK); 1522 1523 u2 constantvalue_index = 0; 1524 bool is_synthetic = false; 1525 u2 generic_signature_index = 0; 1526 const bool is_static = access_flags.is_static(); 1527 FieldAnnotationCollector parsed_annotations(_loader_data); 1528 1529 const u2 attributes_count = cfs->get_u2_fast(); 1530 if (attributes_count > 0) { 1531 parse_field_attributes(cfs, 1532 attributes_count, 1533 is_static, 1534 signature_index, 1535 &constantvalue_index, 1536 &is_synthetic, 1537 &generic_signature_index, 1538 &parsed_annotations, 1539 CHECK); 1540 1541 if (parsed_annotations.field_annotations() != NULL) { 1542 if (_fields_annotations == NULL) { 1543 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1544 _loader_data, length, NULL, 1545 CHECK); 1546 } 1547 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1548 parsed_annotations.set_field_annotations(NULL); 1549 } 1550 if (parsed_annotations.field_type_annotations() != NULL) { 1551 if (_fields_type_annotations == NULL) { 1552 _fields_type_annotations = 1553 MetadataFactory::new_array<AnnotationArray*>(_loader_data, 1554 length, 1555 NULL, 1556 CHECK); 1557 } 1558 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1559 parsed_annotations.set_field_type_annotations(NULL); 1560 } 1561 1562 if (is_synthetic) { 1563 access_flags.set_is_synthetic(); 1564 } 1565 if (generic_signature_index != 0) { 1566 access_flags.set_field_has_generic_signature(); 1567 fa[generic_signature_slot] = generic_signature_index; 1568 generic_signature_slot ++; 1569 num_generic_signature ++; 1570 } 1571 } 1572 1573 FieldInfo* const field = FieldInfo::from_field_array(fa, n); 1574 field->initialize(access_flags.as_short(), 1575 name_index, 1576 signature_index, 1577 constantvalue_index); 1578 const BasicType type = cp->basic_type_for_signature_at(signature_index); 1579 1580 // Remember how many oops we encountered and compute allocation type 1581 const FieldAllocationType atype = fac->update(is_static, type); 1582 field->set_allocation_type(atype); 1583 1584 // After field is initialized with type, we can augment it with aux info 1585 if (parsed_annotations.has_any_annotations()) 1586 parsed_annotations.apply_to(field); 1587 } 1588 1589 int index = length; 1590 if (num_injected != 0) { 1591 for (int n = 0; n < num_injected; n++) { 1592 // Check for duplicates 1593 if (injected[n].may_be_java) { 1594 const Symbol* const name = injected[n].name(); 1595 const Symbol* const signature = injected[n].signature(); 1596 bool duplicate = false; 1597 for (int i = 0; i < length; i++) { 1598 const FieldInfo* const f = FieldInfo::from_field_array(fa, i); 1599 if (name == cp->symbol_at(f->name_index()) && 1600 signature == cp->symbol_at(f->signature_index())) { 1601 // Symbol is desclared in Java so skip this one 1602 duplicate = true; 1603 break; 1604 } 1605 } 1606 if (duplicate) { 1607 // These will be removed from the field array at the end 1608 continue; 1609 } 1610 } 1611 1612 // Injected field 1613 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1614 field->initialize(JVM_ACC_FIELD_INTERNAL, 1615 injected[n].name_index, 1616 injected[n].signature_index, 1617 0); 1618 1619 const BasicType type = FieldType::basic_type(injected[n].signature()); 1620 1621 // Remember how many oops we encountered and compute allocation type 1622 const FieldAllocationType atype = fac->update(false, type); 1623 field->set_allocation_type(atype); 1624 index++; 1625 } 1626 } 1627 1628 assert(NULL == _fields, "invariant"); 1629 1630 _fields = 1631 MetadataFactory::new_array<u2>(_loader_data, 1632 index * FieldInfo::field_slots + num_generic_signature, 1633 CHECK); 1634 // Sometimes injected fields already exist in the Java source so 1635 // the fields array could be too long. In that case the 1636 // fields array is trimed. Also unused slots that were reserved 1637 // for generic signature indexes are discarded. 1638 { 1639 int i = 0; 1640 for (; i < index * FieldInfo::field_slots; i++) { 1641 _fields->at_put(i, fa[i]); 1642 } 1643 for (int j = total_fields * FieldInfo::field_slots; 1644 j < generic_signature_slot; j++) { 1645 _fields->at_put(i++, fa[j]); 1646 } 1647 assert(_fields->length() == i, ""); 1648 } 1649 1650 if (_need_verify && length > 1) { 1651 // Check duplicated fields 1652 ResourceMark rm(THREAD); 1653 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1654 THREAD, NameSigHash*, HASH_ROW_SIZE); 1655 initialize_hashtable(names_and_sigs); 1656 bool dup = false; 1657 { 1658 debug_only(NoSafepointVerifier nsv;) 1659 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 1660 const Symbol* const name = fs.name(); 1661 const Symbol* const sig = fs.signature(); 1662 // If no duplicates, add name/signature in hashtable names_and_sigs. 1663 if (!put_after_lookup(name, sig, names_and_sigs)) { 1664 dup = true; 1665 break; 1666 } 1667 } 1668 } 1669 if (dup) { 1670 classfile_parse_error("Duplicate field name&signature in class file %s", 1671 CHECK); 1672 } 1673 } 1674} 1675 1676 1677static void copy_u2_with_conversion(u2* dest, const u2* src, int length) { 1678 while (length-- > 0) { 1679 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 1680 } 1681} 1682 1683const u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, 1684 u4 code_length, 1685 u4 exception_table_length, 1686 TRAPS) { 1687 assert(cfs != NULL, "invariant"); 1688 1689 const u2* const exception_table_start = cfs->get_u2_buffer(); 1690 assert(exception_table_start != NULL, "null exception table"); 1691 1692 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, 1693 // end_pc, 1694 // handler_pc, 1695 // catch_type_index 1696 1697 // Will check legal target after parsing code array in verifier. 1698 if (_need_verify) { 1699 for (unsigned int i = 0; i < exception_table_length; i++) { 1700 const u2 start_pc = cfs->get_u2_fast(); 1701 const u2 end_pc = cfs->get_u2_fast(); 1702 const u2 handler_pc = cfs->get_u2_fast(); 1703 const u2 catch_type_index = cfs->get_u2_fast(); 1704 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1705 "Illegal exception table range in class file %s", 1706 CHECK_NULL); 1707 guarantee_property(handler_pc < code_length, 1708 "Illegal exception table handler in class file %s", 1709 CHECK_NULL); 1710 if (catch_type_index != 0) { 1711 guarantee_property(valid_klass_reference_at(catch_type_index), 1712 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1713 } 1714 } 1715 } else { 1716 cfs->skip_u2_fast(exception_table_length * 4); 1717 } 1718 return exception_table_start; 1719} 1720 1721void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, 1722 u4 code_length, 1723 CompressedLineNumberWriteStream**const write_stream, 1724 TRAPS) { 1725 1726 const ClassFileStream* const cfs = _stream; 1727 unsigned int num_entries = cfs->get_u2(CHECK); 1728 1729 // Each entry is a u2 start_pc, and a u2 line_number 1730 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); 1731 1732 // Verify line number attribute and table length 1733 check_property( 1734 code_attribute_length == sizeof(u2) + length_in_bytes, 1735 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1736 1737 cfs->guarantee_more(length_in_bytes, CHECK); 1738 1739 if ((*write_stream) == NULL) { 1740 if (length_in_bytes > fixed_buffer_size) { 1741 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1742 } else { 1743 (*write_stream) = new CompressedLineNumberWriteStream( 1744 _linenumbertable_buffer, fixed_buffer_size); 1745 } 1746 } 1747 1748 while (num_entries-- > 0) { 1749 const u2 bci = cfs->get_u2_fast(); // start_pc 1750 const u2 line = cfs->get_u2_fast(); // line_number 1751 guarantee_property(bci < code_length, 1752 "Invalid pc in LineNumberTable in class file %s", CHECK); 1753 (*write_stream)->write_pair(bci, line); 1754 } 1755} 1756 1757 1758class LVT_Hash : public AllStatic { 1759 public: 1760 1761 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1762 /* 1763 * 3-tuple start_bci/length/slot has to be unique key, 1764 * so the following comparison seems to be redundant: 1765 * && elem->name_cp_index == entry->_elem->name_cp_index 1766 */ 1767 return (e0.start_bci == e1.start_bci && 1768 e0.length == e1.length && 1769 e0.name_cp_index == e1.name_cp_index && 1770 e0.slot == e1.slot); 1771 } 1772 1773 static unsigned int hash(LocalVariableTableElement const& e0) { 1774 unsigned int raw_hash = e0.start_bci; 1775 1776 raw_hash = e0.length + raw_hash * 37; 1777 raw_hash = e0.name_cp_index + raw_hash * 37; 1778 raw_hash = e0.slot + raw_hash * 37; 1779 1780 return raw_hash; 1781 } 1782}; 1783 1784 1785// Class file LocalVariableTable elements. 1786class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1787 public: 1788 u2 start_bci; 1789 u2 length; 1790 u2 name_cp_index; 1791 u2 descriptor_cp_index; 1792 u2 slot; 1793}; 1794 1795static void copy_lvt_element(const Classfile_LVT_Element* const src, 1796 LocalVariableTableElement* const lvt) { 1797 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1798 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1799 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1800 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1801 lvt->signature_cp_index = 0; 1802 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1803} 1804 1805// Function is used to parse both attributes: 1806// LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1807const u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, 1808 u4 code_length, 1809 u2 max_locals, 1810 u4 code_attribute_length, 1811 u2* const localvariable_table_length, 1812 bool isLVTT, 1813 TRAPS) { 1814 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1815 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1816 const unsigned int size = 1817 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1818 1819 const ConstantPool* const cp = _cp; 1820 1821 // Verify local variable table attribute has right length 1822 if (_need_verify) { 1823 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1824 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1825 } 1826 1827 const u2* const localvariable_table_start = cfs->get_u2_buffer(); 1828 assert(localvariable_table_start != NULL, "null local variable table"); 1829 if (!_need_verify) { 1830 cfs->skip_u2_fast(size); 1831 } else { 1832 cfs->guarantee_more(size * 2, CHECK_NULL); 1833 for(int i = 0; i < (*localvariable_table_length); i++) { 1834 const u2 start_pc = cfs->get_u2_fast(); 1835 const u2 length = cfs->get_u2_fast(); 1836 const u2 name_index = cfs->get_u2_fast(); 1837 const u2 descriptor_index = cfs->get_u2_fast(); 1838 const u2 index = cfs->get_u2_fast(); 1839 // Assign to a u4 to avoid overflow 1840 const u4 end_pc = (u4)start_pc + (u4)length; 1841 1842 if (start_pc >= code_length) { 1843 classfile_parse_error( 1844 "Invalid start_pc %u in %s in class file %s", 1845 start_pc, tbl_name, CHECK_NULL); 1846 } 1847 if (end_pc > code_length) { 1848 classfile_parse_error( 1849 "Invalid length %u in %s in class file %s", 1850 length, tbl_name, CHECK_NULL); 1851 } 1852 const int cp_size = cp->length(); 1853 guarantee_property(valid_symbol_at(name_index), 1854 "Name index %u in %s has bad constant type in class file %s", 1855 name_index, tbl_name, CHECK_NULL); 1856 guarantee_property(valid_symbol_at(descriptor_index), 1857 "Signature index %u in %s has bad constant type in class file %s", 1858 descriptor_index, tbl_name, CHECK_NULL); 1859 1860 const Symbol* const name = cp->symbol_at(name_index); 1861 const Symbol* const sig = cp->symbol_at(descriptor_index); 1862 verify_legal_field_name(name, CHECK_NULL); 1863 u2 extra_slot = 0; 1864 if (!isLVTT) { 1865 verify_legal_field_signature(name, sig, CHECK_NULL); 1866 1867 // 4894874: check special cases for double and long local variables 1868 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1869 sig == vmSymbols::type_signature(T_LONG)) { 1870 extra_slot = 1; 1871 } 1872 } 1873 guarantee_property((index + extra_slot) < max_locals, 1874 "Invalid index %u in %s in class file %s", 1875 index, tbl_name, CHECK_NULL); 1876 } 1877 } 1878 return localvariable_table_start; 1879} 1880 1881 1882void ClassFileParser::parse_type_array(u2 array_length, 1883 u4 code_length, 1884 u4* const u1_index, 1885 u4* const u2_index, 1886 u1* const u1_array, 1887 u2* const u2_array, 1888 TRAPS) { 1889 const ClassFileStream* const cfs = _stream; 1890 u2 index = 0; // index in the array with long/double occupying two slots 1891 u4 i1 = *u1_index; 1892 u4 i2 = *u2_index + 1; 1893 for(int i = 0; i < array_length; i++) { 1894 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1895 index++; 1896 if (tag == ITEM_Long || tag == ITEM_Double) { 1897 index++; 1898 } else if (tag == ITEM_Object) { 1899 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1900 guarantee_property(valid_klass_reference_at(class_index), 1901 "Bad class index %u in StackMap in class file %s", 1902 class_index, CHECK); 1903 } else if (tag == ITEM_Uninitialized) { 1904 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1905 guarantee_property( 1906 offset < code_length, 1907 "Bad uninitialized type offset %u in StackMap in class file %s", 1908 offset, CHECK); 1909 } else { 1910 guarantee_property( 1911 tag <= (u1)ITEM_Uninitialized, 1912 "Unknown variable type %u in StackMap in class file %s", 1913 tag, CHECK); 1914 } 1915 } 1916 u2_array[*u2_index] = index; 1917 *u1_index = i1; 1918 *u2_index = i2; 1919} 1920 1921static const u1* parse_stackmap_table(const ClassFileStream* const cfs, 1922 u4 code_attribute_length, 1923 bool need_verify, 1924 TRAPS) { 1925 assert(cfs != NULL, "invariant"); 1926 1927 if (0 == code_attribute_length) { 1928 return NULL; 1929 } 1930 1931 const u1* const stackmap_table_start = cfs->get_u1_buffer(); 1932 assert(stackmap_table_start != NULL, "null stackmap table"); 1933 1934 // check code_attribute_length first 1935 cfs->skip_u1(code_attribute_length, CHECK_NULL); 1936 1937 if (!need_verify && !DumpSharedSpaces) { 1938 return NULL; 1939 } 1940 return stackmap_table_start; 1941} 1942 1943const u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, 1944 u2* const checked_exceptions_length, 1945 u4 method_attribute_length, 1946 TRAPS) { 1947 assert(cfs != NULL, "invariant"); 1948 assert(checked_exceptions_length != NULL, "invariant"); 1949 1950 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1951 *checked_exceptions_length = cfs->get_u2_fast(); 1952 const unsigned int size = 1953 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1954 const u2* const checked_exceptions_start = cfs->get_u2_buffer(); 1955 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1956 if (!_need_verify) { 1957 cfs->skip_u2_fast(size); 1958 } else { 1959 // Verify each value in the checked exception table 1960 u2 checked_exception; 1961 const u2 len = *checked_exceptions_length; 1962 cfs->guarantee_more(2 * len, CHECK_NULL); 1963 for (int i = 0; i < len; i++) { 1964 checked_exception = cfs->get_u2_fast(); 1965 check_property( 1966 valid_klass_reference_at(checked_exception), 1967 "Exception name has bad type at constant pool %u in class file %s", 1968 checked_exception, CHECK_NULL); 1969 } 1970 } 1971 // check exceptions attribute length 1972 if (_need_verify) { 1973 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1974 sizeof(u2) * size), 1975 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1976 } 1977 return checked_exceptions_start; 1978} 1979 1980void ClassFileParser::throwIllegalSignature(const char* type, 1981 const Symbol* name, 1982 const Symbol* sig, 1983 TRAPS) const { 1984 assert(name != NULL, "invariant"); 1985 assert(sig != NULL, "invariant"); 1986 1987 ResourceMark rm(THREAD); 1988 Exceptions::fthrow(THREAD_AND_LOCATION, 1989 vmSymbols::java_lang_ClassFormatError(), 1990 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1991 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1992} 1993 1994AnnotationCollector::ID 1995AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, 1996 const Symbol* name) { 1997 const vmSymbols::SID sid = vmSymbols::find_sid(name); 1998 // Privileged code can use all annotations. Other code silently drops some. 1999 const bool privileged = loader_data->is_the_null_class_loader_data() || 2000 loader_data->is_platform_class_loader_data() || 2001 loader_data->is_anonymous(); 2002 switch (sid) { 2003 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { 2004 if (_location != _in_method) break; // only allow for methods 2005 if (!privileged) break; // only allow in privileged code 2006 return _method_CallerSensitive; 2007 } 2008 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { 2009 if (_location != _in_method) break; // only allow for methods 2010 if (!privileged) break; // only allow in privileged code 2011 return _method_ForceInline; 2012 } 2013 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { 2014 if (_location != _in_method) break; // only allow for methods 2015 if (!privileged) break; // only allow in privileged code 2016 return _method_DontInline; 2017 } 2018 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { 2019 if (_location != _in_method) break; // only allow for methods 2020 if (!privileged) break; // only allow in privileged code 2021 return _method_InjectedProfile; 2022 } 2023 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { 2024 if (_location != _in_method) break; // only allow for methods 2025 if (!privileged) break; // only allow in privileged code 2026 return _method_LambdaForm_Compiled; 2027 } 2028 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): { 2029 if (_location != _in_method) break; // only allow for methods 2030 if (!privileged) break; // only allow in privileged code 2031 return _method_LambdaForm_Hidden; 2032 } 2033 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): { 2034 if (_location != _in_method) break; // only allow for methods 2035 if (!privileged) break; // only allow in privileged code 2036 return _method_HotSpotIntrinsicCandidate; 2037 } 2038 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { 2039 if (_location != _in_field) break; // only allow for fields 2040 if (!privileged) break; // only allow in privileged code 2041 return _field_Stable; 2042 } 2043 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { 2044 if (_location != _in_field && _location != _in_class) { 2045 break; // only allow for fields and classes 2046 } 2047 if (!EnableContended || (RestrictContended && !privileged)) { 2048 break; // honor privileges 2049 } 2050 return _jdk_internal_vm_annotation_Contended; 2051 } 2052 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { 2053 if (_location != _in_method) break; // only allow for methods 2054 if (RestrictReservedStack && !privileged) break; // honor privileges 2055 return _jdk_internal_vm_annotation_ReservedStackAccess; 2056 } 2057 default: { 2058 break; 2059 } 2060 } 2061 return AnnotationCollector::_unknown; 2062} 2063 2064void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 2065 if (is_contended()) 2066 f->set_contended_group(contended_group()); 2067 if (is_stable()) 2068 f->set_stable(true); 2069} 2070 2071ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 2072 // If there's an error deallocate metadata for field annotations 2073 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 2074 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 2075} 2076 2077void MethodAnnotationCollector::apply_to(methodHandle m) { 2078 if (has_annotation(_method_CallerSensitive)) 2079 m->set_caller_sensitive(true); 2080 if (has_annotation(_method_ForceInline)) 2081 m->set_force_inline(true); 2082 if (has_annotation(_method_DontInline)) 2083 m->set_dont_inline(true); 2084 if (has_annotation(_method_InjectedProfile)) 2085 m->set_has_injected_profile(true); 2086 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 2087 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 2088 if (has_annotation(_method_LambdaForm_Hidden)) 2089 m->set_hidden(true); 2090 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic()) 2091 m->set_intrinsic_candidate(true); 2092 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) 2093 m->set_has_reserved_stack_access(true); 2094} 2095 2096void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { 2097 assert(ik != NULL, "invariant"); 2098 ik->set_is_contended(is_contended()); 2099} 2100 2101#define MAX_ARGS_SIZE 255 2102#define MAX_CODE_SIZE 65535 2103#define INITIAL_MAX_LVT_NUMBER 256 2104 2105/* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2106 * 2107 * Rules for LVT's and LVTT's are: 2108 * - There can be any number of LVT's and LVTT's. 2109 * - If there are n LVT's, it is the same as if there was just 2110 * one LVT containing all the entries from the n LVT's. 2111 * - There may be no more than one LVT entry per local variable. 2112 * Two LVT entries are 'equal' if these fields are the same: 2113 * start_pc, length, name, slot 2114 * - There may be no more than one LVTT entry per each LVT entry. 2115 * Each LVTT entry has to match some LVT entry. 2116 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2117 */ 2118void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, 2119 int lvt_cnt, 2120 u2* const localvariable_table_length, 2121 const u2**const localvariable_table_start, 2122 int lvtt_cnt, 2123 u2* const localvariable_type_table_length, 2124 const u2**const localvariable_type_table_start, 2125 TRAPS) { 2126 2127 ResourceMark rm(THREAD); 2128 2129 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*, 2130 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 2131 2132 LVT_HashTable* const table = new LVT_HashTable(); 2133 2134 // To fill LocalVariableTable in 2135 const Classfile_LVT_Element* cf_lvt; 2136 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 2137 2138 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2139 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2140 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2141 copy_lvt_element(&cf_lvt[idx], lvt); 2142 // If no duplicates, add LVT elem in hashtable. 2143 if (table->put(*lvt, lvt) == false 2144 && _need_verify 2145 && _major_version >= JAVA_1_5_VERSION) { 2146 classfile_parse_error("Duplicated LocalVariableTable attribute " 2147 "entry for '%s' in class file %s", 2148 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2149 CHECK); 2150 } 2151 } 2152 } 2153 2154 // To merge LocalVariableTable and LocalVariableTypeTable 2155 const Classfile_LVT_Element* cf_lvtt; 2156 LocalVariableTableElement lvtt_elem; 2157 2158 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2159 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2160 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2161 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2162 LocalVariableTableElement** entry = table->get(lvtt_elem); 2163 if (entry == NULL) { 2164 if (_need_verify) { 2165 classfile_parse_error("LVTT entry for '%s' in class file %s " 2166 "does not match any LVT entry", 2167 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2168 CHECK); 2169 } 2170 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 2171 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2172 "entry for '%s' in class file %s", 2173 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2174 CHECK); 2175 } else { 2176 // to add generic signatures into LocalVariableTable 2177 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 2178 } 2179 } 2180 } 2181} 2182 2183 2184void ClassFileParser::copy_method_annotations(ConstMethod* cm, 2185 const u1* runtime_visible_annotations, 2186 int runtime_visible_annotations_length, 2187 const u1* runtime_invisible_annotations, 2188 int runtime_invisible_annotations_length, 2189 const u1* runtime_visible_parameter_annotations, 2190 int runtime_visible_parameter_annotations_length, 2191 const u1* runtime_invisible_parameter_annotations, 2192 int runtime_invisible_parameter_annotations_length, 2193 const u1* runtime_visible_type_annotations, 2194 int runtime_visible_type_annotations_length, 2195 const u1* runtime_invisible_type_annotations, 2196 int runtime_invisible_type_annotations_length, 2197 const u1* annotation_default, 2198 int annotation_default_length, 2199 TRAPS) { 2200 2201 AnnotationArray* a; 2202 2203 if (runtime_visible_annotations_length + 2204 runtime_invisible_annotations_length > 0) { 2205 a = assemble_annotations(runtime_visible_annotations, 2206 runtime_visible_annotations_length, 2207 runtime_invisible_annotations, 2208 runtime_invisible_annotations_length, 2209 CHECK); 2210 cm->set_method_annotations(a); 2211 } 2212 2213 if (runtime_visible_parameter_annotations_length + 2214 runtime_invisible_parameter_annotations_length > 0) { 2215 a = assemble_annotations(runtime_visible_parameter_annotations, 2216 runtime_visible_parameter_annotations_length, 2217 runtime_invisible_parameter_annotations, 2218 runtime_invisible_parameter_annotations_length, 2219 CHECK); 2220 cm->set_parameter_annotations(a); 2221 } 2222 2223 if (annotation_default_length > 0) { 2224 a = assemble_annotations(annotation_default, 2225 annotation_default_length, 2226 NULL, 2227 0, 2228 CHECK); 2229 cm->set_default_annotations(a); 2230 } 2231 2232 if (runtime_visible_type_annotations_length + 2233 runtime_invisible_type_annotations_length > 0) { 2234 a = assemble_annotations(runtime_visible_type_annotations, 2235 runtime_visible_type_annotations_length, 2236 runtime_invisible_type_annotations, 2237 runtime_invisible_type_annotations_length, 2238 CHECK); 2239 cm->set_type_annotations(a); 2240 } 2241} 2242 2243 2244// Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2245// attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2246// Method* to save footprint, so we only know the size of the resulting Method* when the 2247// entire method attribute is parsed. 2248// 2249// The promoted_flags parameter is used to pass relevant access_flags 2250// from the method back up to the containing klass. These flag values 2251// are added to klass's access_flags. 2252 2253Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, 2254 bool is_interface, 2255 const ConstantPool* cp, 2256 AccessFlags* const promoted_flags, 2257 TRAPS) { 2258 assert(cfs != NULL, "invariant"); 2259 assert(cp != NULL, "invariant"); 2260 assert(promoted_flags != NULL, "invariant"); 2261 2262 ResourceMark rm(THREAD); 2263 // Parse fixed parts: 2264 // access_flags, name_index, descriptor_index, attributes_count 2265 cfs->guarantee_more(8, CHECK_NULL); 2266 2267 int flags = cfs->get_u2_fast(); 2268 const u2 name_index = cfs->get_u2_fast(); 2269 const int cp_size = cp->length(); 2270 check_property( 2271 valid_symbol_at(name_index), 2272 "Illegal constant pool index %u for method name in class file %s", 2273 name_index, CHECK_NULL); 2274 const Symbol* const name = cp->symbol_at(name_index); 2275 verify_legal_method_name(name, CHECK_NULL); 2276 2277 const u2 signature_index = cfs->get_u2_fast(); 2278 guarantee_property( 2279 valid_symbol_at(signature_index), 2280 "Illegal constant pool index %u for method signature in class file %s", 2281 signature_index, CHECK_NULL); 2282 const Symbol* const signature = cp->symbol_at(signature_index); 2283 2284 if (name == vmSymbols::class_initializer_name()) { 2285 // We ignore the other access flags for a valid class initializer. 2286 // (JVM Spec 2nd ed., chapter 4.6) 2287 if (_major_version < 51) { // backward compatibility 2288 flags = JVM_ACC_STATIC; 2289 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2290 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2291 } else { 2292 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL); 2293 } 2294 } else { 2295 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL); 2296 } 2297 2298 if (name == vmSymbols::object_initializer_name() && is_interface) { 2299 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL); 2300 } 2301 2302 int args_size = -1; // only used when _need_verify is true 2303 if (_need_verify) { 2304 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2305 verify_legal_method_signature(name, signature, CHECK_NULL); 2306 if (args_size > MAX_ARGS_SIZE) { 2307 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL); 2308 } 2309 } 2310 2311 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2312 2313 // Default values for code and exceptions attribute elements 2314 u2 max_stack = 0; 2315 u2 max_locals = 0; 2316 u4 code_length = 0; 2317 const u1* code_start = 0; 2318 u2 exception_table_length = 0; 2319 const u2* exception_table_start = NULL; 2320 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2321 u2 checked_exceptions_length = 0; 2322 const u2* checked_exceptions_start = NULL; 2323 CompressedLineNumberWriteStream* linenumber_table = NULL; 2324 int linenumber_table_length = 0; 2325 int total_lvt_length = 0; 2326 u2 lvt_cnt = 0; 2327 u2 lvtt_cnt = 0; 2328 bool lvt_allocated = false; 2329 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2330 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2331 u2* localvariable_table_length = NULL; 2332 const u2** localvariable_table_start = NULL; 2333 u2* localvariable_type_table_length = NULL; 2334 const u2** localvariable_type_table_start = NULL; 2335 int method_parameters_length = -1; 2336 const u1* method_parameters_data = NULL; 2337 bool method_parameters_seen = false; 2338 bool parsed_code_attribute = false; 2339 bool parsed_checked_exceptions_attribute = false; 2340 bool parsed_stackmap_attribute = false; 2341 // stackmap attribute - JDK1.5 2342 const u1* stackmap_data = NULL; 2343 int stackmap_data_length = 0; 2344 u2 generic_signature_index = 0; 2345 MethodAnnotationCollector parsed_annotations; 2346 const u1* runtime_visible_annotations = NULL; 2347 int runtime_visible_annotations_length = 0; 2348 const u1* runtime_invisible_annotations = NULL; 2349 int runtime_invisible_annotations_length = 0; 2350 const u1* runtime_visible_parameter_annotations = NULL; 2351 int runtime_visible_parameter_annotations_length = 0; 2352 const u1* runtime_invisible_parameter_annotations = NULL; 2353 int runtime_invisible_parameter_annotations_length = 0; 2354 const u1* runtime_visible_type_annotations = NULL; 2355 int runtime_visible_type_annotations_length = 0; 2356 const u1* runtime_invisible_type_annotations = NULL; 2357 int runtime_invisible_type_annotations_length = 0; 2358 bool runtime_invisible_annotations_exists = false; 2359 bool runtime_invisible_type_annotations_exists = false; 2360 bool runtime_invisible_parameter_annotations_exists = false; 2361 const u1* annotation_default = NULL; 2362 int annotation_default_length = 0; 2363 2364 // Parse code and exceptions attribute 2365 u2 method_attributes_count = cfs->get_u2_fast(); 2366 while (method_attributes_count--) { 2367 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length 2368 const u2 method_attribute_name_index = cfs->get_u2_fast(); 2369 const u4 method_attribute_length = cfs->get_u4_fast(); 2370 check_property( 2371 valid_symbol_at(method_attribute_name_index), 2372 "Invalid method attribute name index %u in class file %s", 2373 method_attribute_name_index, CHECK_NULL); 2374 2375 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); 2376 if (method_attribute_name == vmSymbols::tag_code()) { 2377 // Parse Code attribute 2378 if (_need_verify) { 2379 guarantee_property( 2380 !access_flags.is_native() && !access_flags.is_abstract(), 2381 "Code attribute in native or abstract methods in class file %s", 2382 CHECK_NULL); 2383 } 2384 if (parsed_code_attribute) { 2385 classfile_parse_error("Multiple Code attributes in class file %s", 2386 CHECK_NULL); 2387 } 2388 parsed_code_attribute = true; 2389 2390 // Stack size, locals size, and code size 2391 if (_major_version == 45 && _minor_version <= 2) { 2392 cfs->guarantee_more(4, CHECK_NULL); 2393 max_stack = cfs->get_u1_fast(); 2394 max_locals = cfs->get_u1_fast(); 2395 code_length = cfs->get_u2_fast(); 2396 } else { 2397 cfs->guarantee_more(8, CHECK_NULL); 2398 max_stack = cfs->get_u2_fast(); 2399 max_locals = cfs->get_u2_fast(); 2400 code_length = cfs->get_u4_fast(); 2401 } 2402 if (_need_verify) { 2403 guarantee_property(args_size <= max_locals, 2404 "Arguments can't fit into locals in class file %s", 2405 CHECK_NULL); 2406 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2407 "Invalid method Code length %u in class file %s", 2408 code_length, CHECK_NULL); 2409 } 2410 // Code pointer 2411 code_start = cfs->get_u1_buffer(); 2412 assert(code_start != NULL, "null code start"); 2413 cfs->guarantee_more(code_length, CHECK_NULL); 2414 cfs->skip_u1_fast(code_length); 2415 2416 // Exception handler table 2417 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length 2418 exception_table_length = cfs->get_u2_fast(); 2419 if (exception_table_length > 0) { 2420 exception_table_start = parse_exception_table(cfs, 2421 code_length, 2422 exception_table_length, 2423 CHECK_NULL); 2424 } 2425 2426 // Parse additional attributes in code attribute 2427 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count 2428 u2 code_attributes_count = cfs->get_u2_fast(); 2429 2430 unsigned int calculated_attribute_length = 0; 2431 2432 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2433 calculated_attribute_length = 2434 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2435 } else { 2436 // max_stack, locals and length are smaller in pre-version 45.2 classes 2437 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2438 } 2439 calculated_attribute_length += 2440 code_length + 2441 sizeof(exception_table_length) + 2442 sizeof(code_attributes_count) + 2443 exception_table_length * 2444 ( sizeof(u2) + // start_pc 2445 sizeof(u2) + // end_pc 2446 sizeof(u2) + // handler_pc 2447 sizeof(u2) ); // catch_type_index 2448 2449 while (code_attributes_count--) { 2450 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length 2451 const u2 code_attribute_name_index = cfs->get_u2_fast(); 2452 const u4 code_attribute_length = cfs->get_u4_fast(); 2453 calculated_attribute_length += code_attribute_length + 2454 sizeof(code_attribute_name_index) + 2455 sizeof(code_attribute_length); 2456 check_property(valid_symbol_at(code_attribute_name_index), 2457 "Invalid code attribute name index %u in class file %s", 2458 code_attribute_name_index, 2459 CHECK_NULL); 2460 if (LoadLineNumberTables && 2461 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2462 // Parse and compress line number table 2463 parse_linenumber_table(code_attribute_length, 2464 code_length, 2465 &linenumber_table, 2466 CHECK_NULL); 2467 2468 } else if (LoadLocalVariableTables && 2469 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2470 // Parse local variable table 2471 if (!lvt_allocated) { 2472 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2473 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2474 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2475 THREAD, const u2*, INITIAL_MAX_LVT_NUMBER); 2476 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2477 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2478 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2479 THREAD, const u2*, INITIAL_MAX_LVT_NUMBER); 2480 lvt_allocated = true; 2481 } 2482 if (lvt_cnt == max_lvt_cnt) { 2483 max_lvt_cnt <<= 1; 2484 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2485 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2486 } 2487 localvariable_table_start[lvt_cnt] = 2488 parse_localvariable_table(cfs, 2489 code_length, 2490 max_locals, 2491 code_attribute_length, 2492 &localvariable_table_length[lvt_cnt], 2493 false, // is not LVTT 2494 CHECK_NULL); 2495 total_lvt_length += localvariable_table_length[lvt_cnt]; 2496 lvt_cnt++; 2497 } else if (LoadLocalVariableTypeTables && 2498 _major_version >= JAVA_1_5_VERSION && 2499 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2500 if (!lvt_allocated) { 2501 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2502 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2503 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2504 THREAD, const u2*, INITIAL_MAX_LVT_NUMBER); 2505 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2506 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2507 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2508 THREAD, const u2*, INITIAL_MAX_LVT_NUMBER); 2509 lvt_allocated = true; 2510 } 2511 // Parse local variable type table 2512 if (lvtt_cnt == max_lvtt_cnt) { 2513 max_lvtt_cnt <<= 1; 2514 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2515 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2516 } 2517 localvariable_type_table_start[lvtt_cnt] = 2518 parse_localvariable_table(cfs, 2519 code_length, 2520 max_locals, 2521 code_attribute_length, 2522 &localvariable_type_table_length[lvtt_cnt], 2523 true, // is LVTT 2524 CHECK_NULL); 2525 lvtt_cnt++; 2526 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2527 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2528 // Stack map is only needed by the new verifier in JDK1.5. 2529 if (parsed_stackmap_attribute) { 2530 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL); 2531 } 2532 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL); 2533 stackmap_data_length = code_attribute_length; 2534 parsed_stackmap_attribute = true; 2535 } else { 2536 // Skip unknown attributes 2537 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2538 } 2539 } 2540 // check method attribute length 2541 if (_need_verify) { 2542 guarantee_property(method_attribute_length == calculated_attribute_length, 2543 "Code segment has wrong length in class file %s", 2544 CHECK_NULL); 2545 } 2546 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2547 // Parse Exceptions attribute 2548 if (parsed_checked_exceptions_attribute) { 2549 classfile_parse_error("Multiple Exceptions attributes in class file %s", 2550 CHECK_NULL); 2551 } 2552 parsed_checked_exceptions_attribute = true; 2553 checked_exceptions_start = 2554 parse_checked_exceptions(cfs, 2555 &checked_exceptions_length, 2556 method_attribute_length, 2557 CHECK_NULL); 2558 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2559 // reject multiple method parameters 2560 if (method_parameters_seen) { 2561 classfile_parse_error("Multiple MethodParameters attributes in class file %s", 2562 CHECK_NULL); 2563 } 2564 method_parameters_seen = true; 2565 method_parameters_length = cfs->get_u1_fast(); 2566 const u2 real_length = (method_parameters_length * 4u) + 1u; 2567 if (method_attribute_length != real_length) { 2568 classfile_parse_error( 2569 "Invalid MethodParameters method attribute length %u in class file", 2570 method_attribute_length, CHECK_NULL); 2571 } 2572 method_parameters_data = cfs->get_u1_buffer(); 2573 cfs->skip_u2_fast(method_parameters_length); 2574 cfs->skip_u2_fast(method_parameters_length); 2575 // ignore this attribute if it cannot be reflected 2576 if (!SystemDictionary::Parameter_klass_loaded()) 2577 method_parameters_length = -1; 2578 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2579 if (method_attribute_length != 0) { 2580 classfile_parse_error( 2581 "Invalid Synthetic method attribute length %u in class file %s", 2582 method_attribute_length, CHECK_NULL); 2583 } 2584 // Should we check that there hasn't already been a synthetic attribute? 2585 access_flags.set_is_synthetic(); 2586 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2587 if (method_attribute_length != 0) { 2588 classfile_parse_error( 2589 "Invalid Deprecated method attribute length %u in class file %s", 2590 method_attribute_length, CHECK_NULL); 2591 } 2592 } else if (_major_version >= JAVA_1_5_VERSION) { 2593 if (method_attribute_name == vmSymbols::tag_signature()) { 2594 if (generic_signature_index != 0) { 2595 classfile_parse_error( 2596 "Multiple Signature attributes for method in class file %s", 2597 CHECK_NULL); 2598 } 2599 if (method_attribute_length != 2) { 2600 classfile_parse_error( 2601 "Invalid Signature attribute length %u in class file %s", 2602 method_attribute_length, CHECK_NULL); 2603 } 2604 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); 2605 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2606 if (runtime_visible_annotations != NULL) { 2607 classfile_parse_error( 2608 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", 2609 CHECK_NULL); 2610 } 2611 runtime_visible_annotations_length = method_attribute_length; 2612 runtime_visible_annotations = cfs->get_u1_buffer(); 2613 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2614 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); 2615 parse_annotations(cp, 2616 runtime_visible_annotations, 2617 runtime_visible_annotations_length, 2618 &parsed_annotations, 2619 _loader_data, 2620 CHECK_NULL); 2621 cfs->skip_u1_fast(runtime_visible_annotations_length); 2622 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2623 if (runtime_invisible_annotations_exists) { 2624 classfile_parse_error( 2625 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", 2626 CHECK_NULL); 2627 } 2628 runtime_invisible_annotations_exists = true; 2629 if (PreserveAllAnnotations) { 2630 runtime_invisible_annotations_length = method_attribute_length; 2631 runtime_invisible_annotations = cfs->get_u1_buffer(); 2632 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2633 } 2634 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2635 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2636 if (runtime_visible_parameter_annotations != NULL) { 2637 classfile_parse_error( 2638 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", 2639 CHECK_NULL); 2640 } 2641 runtime_visible_parameter_annotations_length = method_attribute_length; 2642 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 2643 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2644 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); 2645 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2646 if (runtime_invisible_parameter_annotations_exists) { 2647 classfile_parse_error( 2648 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", 2649 CHECK_NULL); 2650 } 2651 runtime_invisible_parameter_annotations_exists = true; 2652 if (PreserveAllAnnotations) { 2653 runtime_invisible_parameter_annotations_length = method_attribute_length; 2654 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 2655 assert(runtime_invisible_parameter_annotations != NULL, 2656 "null invisible parameter annotations"); 2657 } 2658 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2659 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2660 if (annotation_default != NULL) { 2661 classfile_parse_error( 2662 "Multiple AnnotationDefault attributes for method in class file %s", 2663 CHECK_NULL); 2664 } 2665 annotation_default_length = method_attribute_length; 2666 annotation_default = cfs->get_u1_buffer(); 2667 assert(annotation_default != NULL, "null annotation default"); 2668 cfs->skip_u1(annotation_default_length, CHECK_NULL); 2669 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2670 if (runtime_visible_type_annotations != NULL) { 2671 classfile_parse_error( 2672 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2673 CHECK_NULL); 2674 } 2675 runtime_visible_type_annotations_length = method_attribute_length; 2676 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2677 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2678 // No need for the VM to parse Type annotations 2679 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); 2680 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2681 if (runtime_invisible_type_annotations_exists) { 2682 classfile_parse_error( 2683 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2684 CHECK_NULL); 2685 } else { 2686 runtime_invisible_type_annotations_exists = true; 2687 } 2688 if (PreserveAllAnnotations) { 2689 runtime_invisible_type_annotations_length = method_attribute_length; 2690 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 2691 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2692 } 2693 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2694 } else { 2695 // Skip unknown attributes 2696 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2697 } 2698 } else { 2699 // Skip unknown attributes 2700 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2701 } 2702 } 2703 2704 if (linenumber_table != NULL) { 2705 linenumber_table->write_terminator(); 2706 linenumber_table_length = linenumber_table->position(); 2707 } 2708 2709 // Make sure there's at least one Code attribute in non-native/non-abstract method 2710 if (_need_verify) { 2711 guarantee_property(access_flags.is_native() || 2712 access_flags.is_abstract() || 2713 parsed_code_attribute, 2714 "Absent Code attribute in method that is not native or abstract in class file %s", 2715 CHECK_NULL); 2716 } 2717 2718 // All sizing information for a Method* is finally available, now create it 2719 InlineTableSizes sizes( 2720 total_lvt_length, 2721 linenumber_table_length, 2722 exception_table_length, 2723 checked_exceptions_length, 2724 method_parameters_length, 2725 generic_signature_index, 2726 runtime_visible_annotations_length + 2727 runtime_invisible_annotations_length, 2728 runtime_visible_parameter_annotations_length + 2729 runtime_invisible_parameter_annotations_length, 2730 runtime_visible_type_annotations_length + 2731 runtime_invisible_type_annotations_length, 2732 annotation_default_length, 2733 0); 2734 2735 Method* const m = Method::allocate(_loader_data, 2736 code_length, 2737 access_flags, 2738 &sizes, 2739 ConstMethod::NORMAL, 2740 CHECK_NULL); 2741 2742 ClassLoadingService::add_class_method_size(m->size()*wordSize); 2743 2744 // Fill in information from fixed part (access_flags already set) 2745 m->set_constants(_cp); 2746 m->set_name_index(name_index); 2747 m->set_signature_index(signature_index); 2748 2749 ResultTypeFinder rtf(cp->symbol_at(signature_index)); 2750 m->constMethod()->set_result_type(rtf.type()); 2751 2752 if (args_size >= 0) { 2753 m->set_size_of_parameters(args_size); 2754 } else { 2755 m->compute_size_of_parameters(THREAD); 2756 } 2757#ifdef ASSERT 2758 if (args_size >= 0) { 2759 m->compute_size_of_parameters(THREAD); 2760 assert(args_size == m->size_of_parameters(), ""); 2761 } 2762#endif 2763 2764 // Fill in code attribute information 2765 m->set_max_stack(max_stack); 2766 m->set_max_locals(max_locals); 2767 if (stackmap_data != NULL) { 2768 m->constMethod()->copy_stackmap_data(_loader_data, 2769 (u1*)stackmap_data, 2770 stackmap_data_length, 2771 CHECK_NULL); 2772 } 2773 2774 // Copy byte codes 2775 m->set_code((u1*)code_start); 2776 2777 // Copy line number table 2778 if (linenumber_table != NULL) { 2779 memcpy(m->compressed_linenumber_table(), 2780 linenumber_table->buffer(), 2781 linenumber_table_length); 2782 } 2783 2784 // Copy exception table 2785 if (exception_table_length > 0) { 2786 int size = 2787 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2); 2788 copy_u2_with_conversion((u2*) m->exception_table_start(), 2789 exception_table_start, size); 2790 } 2791 2792 // Copy method parameters 2793 if (method_parameters_length > 0) { 2794 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2795 for (int i = 0; i < method_parameters_length; i++) { 2796 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); 2797 method_parameters_data += 2; 2798 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); 2799 method_parameters_data += 2; 2800 } 2801 } 2802 2803 // Copy checked exceptions 2804 if (checked_exceptions_length > 0) { 2805 const int size = 2806 checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 2807 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), 2808 checked_exceptions_start, 2809 size); 2810 } 2811 2812 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2813 if (total_lvt_length > 0) { 2814 promoted_flags->set_has_localvariable_table(); 2815 copy_localvariable_table(m->constMethod(), 2816 lvt_cnt, 2817 localvariable_table_length, 2818 localvariable_table_start, 2819 lvtt_cnt, 2820 localvariable_type_table_length, 2821 localvariable_type_table_start, 2822 CHECK_NULL); 2823 } 2824 2825 if (parsed_annotations.has_any_annotations()) 2826 parsed_annotations.apply_to(m); 2827 2828 // Copy annotations 2829 copy_method_annotations(m->constMethod(), 2830 runtime_visible_annotations, 2831 runtime_visible_annotations_length, 2832 runtime_invisible_annotations, 2833 runtime_invisible_annotations_length, 2834 runtime_visible_parameter_annotations, 2835 runtime_visible_parameter_annotations_length, 2836 runtime_invisible_parameter_annotations, 2837 runtime_invisible_parameter_annotations_length, 2838 runtime_visible_type_annotations, 2839 runtime_visible_type_annotations_length, 2840 runtime_invisible_type_annotations, 2841 runtime_invisible_type_annotations_length, 2842 annotation_default, 2843 annotation_default_length, 2844 CHECK_NULL); 2845 2846 if (name == vmSymbols::finalize_method_name() && 2847 signature == vmSymbols::void_method_signature()) { 2848 if (m->is_empty_method()) { 2849 _has_empty_finalizer = true; 2850 } else { 2851 _has_finalizer = true; 2852 } 2853 } 2854 if (name == vmSymbols::object_initializer_name() && 2855 signature == vmSymbols::void_method_signature() && 2856 m->is_vanilla_constructor()) { 2857 _has_vanilla_constructor = true; 2858 } 2859 2860 NOT_PRODUCT(m->verify()); 2861 return m; 2862} 2863 2864 2865// The promoted_flags parameter is used to pass relevant access_flags 2866// from the methods back up to the containing klass. These flag values 2867// are added to klass's access_flags. 2868// Side-effects: populates the _methods field in the parser 2869void ClassFileParser::parse_methods(const ClassFileStream* const cfs, 2870 bool is_interface, 2871 AccessFlags* promoted_flags, 2872 bool* has_final_method, 2873 bool* declares_nonstatic_concrete_methods, 2874 TRAPS) { 2875 assert(cfs != NULL, "invariant"); 2876 assert(promoted_flags != NULL, "invariant"); 2877 assert(has_final_method != NULL, "invariant"); 2878 assert(declares_nonstatic_concrete_methods != NULL, "invariant"); 2879 2880 assert(NULL == _methods, "invariant"); 2881 2882 cfs->guarantee_more(2, CHECK); // length 2883 const u2 length = cfs->get_u2_fast(); 2884 if (length == 0) { 2885 _methods = Universe::the_empty_method_array(); 2886 } else { 2887 _methods = MetadataFactory::new_array<Method*>(_loader_data, 2888 length, 2889 NULL, 2890 CHECK); 2891 2892 HandleMark hm(THREAD); 2893 for (int index = 0; index < length; index++) { 2894 Method* method = parse_method(cfs, 2895 is_interface, 2896 _cp, 2897 promoted_flags, 2898 CHECK); 2899 2900 if (method->is_final()) { 2901 *has_final_method = true; 2902 } 2903 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags 2904 // used for interface initialization, and default method inheritance analysis 2905 if (is_interface && !(*declares_nonstatic_concrete_methods) 2906 && !method->is_abstract() && !method->is_static()) { 2907 *declares_nonstatic_concrete_methods = true; 2908 } 2909 _methods->at_put(index, method); 2910 } 2911 2912 if (_need_verify && length > 1) { 2913 // Check duplicated methods 2914 ResourceMark rm(THREAD); 2915 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2916 THREAD, NameSigHash*, HASH_ROW_SIZE); 2917 initialize_hashtable(names_and_sigs); 2918 bool dup = false; 2919 { 2920 debug_only(NoSafepointVerifier nsv;) 2921 for (int i = 0; i < length; i++) { 2922 const Method* const m = _methods->at(i); 2923 // If no duplicates, add name/signature in hashtable names_and_sigs. 2924 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 2925 dup = true; 2926 break; 2927 } 2928 } 2929 } 2930 if (dup) { 2931 classfile_parse_error("Duplicate method name&signature in class file %s", 2932 CHECK); 2933 } 2934 } 2935 } 2936} 2937 2938static const intArray* sort_methods(Array<Method*>* methods) { 2939 const int length = methods->length(); 2940 // If JVMTI original method ordering or sharing is enabled we have to 2941 // remember the original class file ordering. 2942 // We temporarily use the vtable_index field in the Method* to store the 2943 // class file index, so we can read in after calling qsort. 2944 // Put the method ordering in the shared archive. 2945 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2946 for (int index = 0; index < length; index++) { 2947 Method* const m = methods->at(index); 2948 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2949 m->set_vtable_index(index); 2950 } 2951 } 2952 // Sort method array by ascending method name (for faster lookups & vtable construction) 2953 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2954 Method::sort_methods(methods); 2955 2956 intArray* method_ordering = NULL; 2957 // If JVMTI original method ordering or sharing is enabled construct int 2958 // array remembering the original ordering 2959 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2960 method_ordering = new intArray(length, length, -1); 2961 for (int index = 0; index < length; index++) { 2962 Method* const m = methods->at(index); 2963 const int old_index = m->vtable_index(); 2964 assert(old_index >= 0 && old_index < length, "invalid method index"); 2965 method_ordering->at_put(index, old_index); 2966 m->set_vtable_index(Method::invalid_vtable_index); 2967 } 2968 } 2969 return method_ordering; 2970} 2971 2972// Parse generic_signature attribute for methods and fields 2973u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, 2974 TRAPS) { 2975 assert(cfs != NULL, "invariant"); 2976 2977 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 2978 const u2 generic_signature_index = cfs->get_u2_fast(); 2979 check_property( 2980 valid_symbol_at(generic_signature_index), 2981 "Invalid Signature attribute at constant pool index %u in class file %s", 2982 generic_signature_index, CHECK_0); 2983 return generic_signature_index; 2984} 2985 2986void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, 2987 TRAPS) { 2988 2989 assert(cfs != NULL, "invariant"); 2990 2991 cfs->guarantee_more(2, CHECK); // sourcefile_index 2992 const u2 sourcefile_index = cfs->get_u2_fast(); 2993 check_property( 2994 valid_symbol_at(sourcefile_index), 2995 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2996 sourcefile_index, CHECK); 2997 set_class_sourcefile_index(sourcefile_index); 2998} 2999 3000void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, 3001 int length, 3002 TRAPS) { 3003 assert(cfs != NULL, "invariant"); 3004 3005 const u1* const sde_buffer = cfs->get_u1_buffer(); 3006 assert(sde_buffer != NULL, "null sde buffer"); 3007 3008 // Don't bother storing it if there is no way to retrieve it 3009 if (JvmtiExport::can_get_source_debug_extension()) { 3010 assert((length+1) > length, "Overflow checking"); 3011 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 3012 for (int i = 0; i < length; i++) { 3013 sde[i] = sde_buffer[i]; 3014 } 3015 sde[length] = '\0'; 3016 set_class_sde_buffer((const char*)sde, length); 3017 } 3018 // Got utf8 string, set stream position forward 3019 cfs->skip_u1(length, CHECK); 3020} 3021 3022 3023// Inner classes can be static, private or protected (classic VM does this) 3024#define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ 3025 JVM_ACC_PRIVATE | \ 3026 JVM_ACC_PROTECTED | \ 3027 JVM_ACC_STATIC \ 3028 ) 3029 3030// Return number of classes in the inner classes attribute table 3031u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, 3032 const u1* const inner_classes_attribute_start, 3033 bool parsed_enclosingmethod_attribute, 3034 u2 enclosing_method_class_index, 3035 u2 enclosing_method_method_index, 3036 TRAPS) { 3037 const u1* const current_mark = cfs->current(); 3038 u2 length = 0; 3039 if (inner_classes_attribute_start != NULL) { 3040 cfs->set_current(inner_classes_attribute_start); 3041 cfs->guarantee_more(2, CHECK_0); // length 3042 length = cfs->get_u2_fast(); 3043 } 3044 3045 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 3046 // method data: 3047 // [inner_class_info_index, 3048 // outer_class_info_index, 3049 // inner_name_index, 3050 // inner_class_access_flags, 3051 // ... 3052 // enclosing_method_class_index, 3053 // enclosing_method_method_index] 3054 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 3055 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3056 _inner_classes = inner_classes; 3057 3058 int index = 0; 3059 const int cp_size = _cp->length(); 3060 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 3061 for (int n = 0; n < length; n++) { 3062 // Inner class index 3063 const u2 inner_class_info_index = cfs->get_u2_fast(); 3064 check_property( 3065 valid_klass_reference_at(inner_class_info_index), 3066 "inner_class_info_index %u has bad constant type in class file %s", 3067 inner_class_info_index, CHECK_0); 3068 // Outer class index 3069 const u2 outer_class_info_index = cfs->get_u2_fast(); 3070 check_property( 3071 outer_class_info_index == 0 || 3072 valid_klass_reference_at(outer_class_info_index), 3073 "outer_class_info_index %u has bad constant type in class file %s", 3074 outer_class_info_index, CHECK_0); 3075 // Inner class name 3076 const u2 inner_name_index = cfs->get_u2_fast(); 3077 check_property( 3078 inner_name_index == 0 || valid_symbol_at(inner_name_index), 3079 "inner_name_index %u has bad constant type in class file %s", 3080 inner_name_index, CHECK_0); 3081 if (_need_verify) { 3082 guarantee_property(inner_class_info_index != outer_class_info_index, 3083 "Class is both outer and inner class in class file %s", CHECK_0); 3084 } 3085 // Access flags 3086 jint flags; 3087 // JVM_ACC_MODULE is defined in JDK-9 and later. 3088 if (_major_version >= JAVA_9_VERSION) { 3089 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE); 3090 } else { 3091 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 3092 } 3093 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3094 // Set abstract bit for old class files for backward compatibility 3095 flags |= JVM_ACC_ABSTRACT; 3096 } 3097 verify_legal_class_modifiers(flags, CHECK_0); 3098 AccessFlags inner_access_flags(flags); 3099 3100 inner_classes->at_put(index++, inner_class_info_index); 3101 inner_classes->at_put(index++, outer_class_info_index); 3102 inner_classes->at_put(index++, inner_name_index); 3103 inner_classes->at_put(index++, inner_access_flags.as_short()); 3104 } 3105 3106 // 4347400: make sure there's no duplicate entry in the classes array 3107 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 3108 for(int i = 0; i < length * 4; i += 4) { 3109 for(int j = i + 4; j < length * 4; j += 4) { 3110 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 3111 inner_classes->at(i+1) != inner_classes->at(j+1) || 3112 inner_classes->at(i+2) != inner_classes->at(j+2) || 3113 inner_classes->at(i+3) != inner_classes->at(j+3)), 3114 "Duplicate entry in InnerClasses in class file %s", 3115 CHECK_0); 3116 } 3117 } 3118 } 3119 3120 // Set EnclosingMethod class and method indexes. 3121 if (parsed_enclosingmethod_attribute) { 3122 inner_classes->at_put(index++, enclosing_method_class_index); 3123 inner_classes->at_put(index++, enclosing_method_method_index); 3124 } 3125 assert(index == size, "wrong size"); 3126 3127 // Restore buffer's current position. 3128 cfs->set_current(current_mark); 3129 3130 return length; 3131} 3132 3133void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 3134 set_class_synthetic_flag(true); 3135} 3136 3137void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { 3138 assert(cfs != NULL, "invariant"); 3139 3140 const u2 signature_index = cfs->get_u2(CHECK); 3141 check_property( 3142 valid_symbol_at(signature_index), 3143 "Invalid constant pool index %u in Signature attribute in class file %s", 3144 signature_index, CHECK); 3145 set_class_generic_signature_index(signature_index); 3146} 3147 3148void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, 3149 ConstantPool* cp, 3150 u4 attribute_byte_length, 3151 TRAPS) { 3152 assert(cfs != NULL, "invariant"); 3153 assert(cp != NULL, "invariant"); 3154 3155 const u1* const current_start = cfs->current(); 3156 3157 guarantee_property(attribute_byte_length >= sizeof(u2), 3158 "Invalid BootstrapMethods attribute length %u in class file %s", 3159 attribute_byte_length, 3160 CHECK); 3161 3162 cfs->guarantee_more(attribute_byte_length, CHECK); 3163 3164 const int attribute_array_length = cfs->get_u2_fast(); 3165 3166 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 3167 "Short length on BootstrapMethods in class file %s", 3168 CHECK); 3169 3170 3171 // The attribute contains a counted array of counted tuples of shorts, 3172 // represending bootstrap specifiers: 3173 // length*{bootstrap_method_index, argument_count*{argument_index}} 3174 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 3175 // operand_count = number of shorts in attr, except for leading length 3176 3177 // The attribute is copied into a short[] array. 3178 // The array begins with a series of short[2] pairs, one for each tuple. 3179 const int index_size = (attribute_array_length * 2); 3180 3181 Array<u2>* const operands = 3182 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 3183 3184 // Eagerly assign operands so they will be deallocated with the constant 3185 // pool if there is an error. 3186 cp->set_operands(operands); 3187 3188 int operand_fill_index = index_size; 3189 const int cp_size = cp->length(); 3190 3191 for (int n = 0; n < attribute_array_length; n++) { 3192 // Store a 32-bit offset into the header of the operand array. 3193 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 3194 3195 // Read a bootstrap specifier. 3196 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 3197 const u2 bootstrap_method_index = cfs->get_u2_fast(); 3198 const u2 argument_count = cfs->get_u2_fast(); 3199 check_property( 3200 valid_cp_range(bootstrap_method_index, cp_size) && 3201 cp->tag_at(bootstrap_method_index).is_method_handle(), 3202 "bootstrap_method_index %u has bad constant type in class file %s", 3203 bootstrap_method_index, 3204 CHECK); 3205 3206 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 3207 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 3208 CHECK); 3209 3210 operands->at_put(operand_fill_index++, bootstrap_method_index); 3211 operands->at_put(operand_fill_index++, argument_count); 3212 3213 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 3214 for (int j = 0; j < argument_count; j++) { 3215 const u2 argument_index = cfs->get_u2_fast(); 3216 check_property( 3217 valid_cp_range(argument_index, cp_size) && 3218 cp->tag_at(argument_index).is_loadable_constant(), 3219 "argument_index %u has bad constant type in class file %s", 3220 argument_index, 3221 CHECK); 3222 operands->at_put(operand_fill_index++, argument_index); 3223 } 3224 } 3225 guarantee_property(current_start + attribute_byte_length == cfs->current(), 3226 "Bad length on BootstrapMethods in class file %s", 3227 CHECK); 3228} 3229 3230void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, 3231 ConstantPool* cp, 3232 ClassFileParser::ClassAnnotationCollector* parsed_annotations, 3233 TRAPS) { 3234 assert(cfs != NULL, "invariant"); 3235 assert(cp != NULL, "invariant"); 3236 assert(parsed_annotations != NULL, "invariant"); 3237 3238 // Set inner classes attribute to default sentinel 3239 _inner_classes = Universe::the_empty_short_array(); 3240 cfs->guarantee_more(2, CHECK); // attributes_count 3241 u2 attributes_count = cfs->get_u2_fast(); 3242 bool parsed_sourcefile_attribute = false; 3243 bool parsed_innerclasses_attribute = false; 3244 bool parsed_enclosingmethod_attribute = false; 3245 bool parsed_bootstrap_methods_attribute = false; 3246 const u1* runtime_visible_annotations = NULL; 3247 int runtime_visible_annotations_length = 0; 3248 const u1* runtime_invisible_annotations = NULL; 3249 int runtime_invisible_annotations_length = 0; 3250 const u1* runtime_visible_type_annotations = NULL; 3251 int runtime_visible_type_annotations_length = 0; 3252 const u1* runtime_invisible_type_annotations = NULL; 3253 int runtime_invisible_type_annotations_length = 0; 3254 bool runtime_invisible_type_annotations_exists = false; 3255 bool runtime_invisible_annotations_exists = false; 3256 bool parsed_source_debug_ext_annotations_exist = false; 3257 const u1* inner_classes_attribute_start = NULL; 3258 u4 inner_classes_attribute_length = 0; 3259 u2 enclosing_method_class_index = 0; 3260 u2 enclosing_method_method_index = 0; 3261 // Iterate over attributes 3262 while (attributes_count--) { 3263 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 3264 const u2 attribute_name_index = cfs->get_u2_fast(); 3265 const u4 attribute_length = cfs->get_u4_fast(); 3266 check_property( 3267 valid_symbol_at(attribute_name_index), 3268 "Attribute name has bad constant pool index %u in class file %s", 3269 attribute_name_index, CHECK); 3270 const Symbol* const tag = cp->symbol_at(attribute_name_index); 3271 if (tag == vmSymbols::tag_source_file()) { 3272 // Check for SourceFile tag 3273 if (_need_verify) { 3274 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 3275 } 3276 if (parsed_sourcefile_attribute) { 3277 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 3278 } else { 3279 parsed_sourcefile_attribute = true; 3280 } 3281 parse_classfile_sourcefile_attribute(cfs, CHECK); 3282 } else if (tag == vmSymbols::tag_source_debug_extension()) { 3283 // Check for SourceDebugExtension tag 3284 if (parsed_source_debug_ext_annotations_exist) { 3285 classfile_parse_error( 3286 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 3287 } 3288 parsed_source_debug_ext_annotations_exist = true; 3289 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); 3290 } else if (tag == vmSymbols::tag_inner_classes()) { 3291 // Check for InnerClasses tag 3292 if (parsed_innerclasses_attribute) { 3293 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 3294 } else { 3295 parsed_innerclasses_attribute = true; 3296 } 3297 inner_classes_attribute_start = cfs->get_u1_buffer(); 3298 inner_classes_attribute_length = attribute_length; 3299 cfs->skip_u1(inner_classes_attribute_length, CHECK); 3300 } else if (tag == vmSymbols::tag_synthetic()) { 3301 // Check for Synthetic tag 3302 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 3303 if (attribute_length != 0) { 3304 classfile_parse_error( 3305 "Invalid Synthetic classfile attribute length %u in class file %s", 3306 attribute_length, CHECK); 3307 } 3308 parse_classfile_synthetic_attribute(CHECK); 3309 } else if (tag == vmSymbols::tag_deprecated()) { 3310 // Check for Deprecatd tag - 4276120 3311 if (attribute_length != 0) { 3312 classfile_parse_error( 3313 "Invalid Deprecated classfile attribute length %u in class file %s", 3314 attribute_length, CHECK); 3315 } 3316 } else if (_major_version >= JAVA_1_5_VERSION) { 3317 if (tag == vmSymbols::tag_signature()) { 3318 if (_generic_signature_index != 0) { 3319 classfile_parse_error( 3320 "Multiple Signature attributes in class file %s", CHECK); 3321 } 3322 if (attribute_length != 2) { 3323 classfile_parse_error( 3324 "Wrong Signature attribute length %u in class file %s", 3325 attribute_length, CHECK); 3326 } 3327 parse_classfile_signature_attribute(cfs, CHECK); 3328 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 3329 if (runtime_visible_annotations != NULL) { 3330 classfile_parse_error( 3331 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 3332 } 3333 runtime_visible_annotations_length = attribute_length; 3334 runtime_visible_annotations = cfs->get_u1_buffer(); 3335 assert(runtime_visible_annotations != NULL, "null visible annotations"); 3336 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 3337 parse_annotations(cp, 3338 runtime_visible_annotations, 3339 runtime_visible_annotations_length, 3340 parsed_annotations, 3341 _loader_data, 3342 CHECK); 3343 cfs->skip_u1_fast(runtime_visible_annotations_length); 3344 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 3345 if (runtime_invisible_annotations_exists) { 3346 classfile_parse_error( 3347 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 3348 } 3349 runtime_invisible_annotations_exists = true; 3350 if (PreserveAllAnnotations) { 3351 runtime_invisible_annotations_length = attribute_length; 3352 runtime_invisible_annotations = cfs->get_u1_buffer(); 3353 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 3354 } 3355 cfs->skip_u1(attribute_length, CHECK); 3356 } else if (tag == vmSymbols::tag_enclosing_method()) { 3357 if (parsed_enclosingmethod_attribute) { 3358 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 3359 } else { 3360 parsed_enclosingmethod_attribute = true; 3361 } 3362 guarantee_property(attribute_length == 4, 3363 "Wrong EnclosingMethod attribute length %u in class file %s", 3364 attribute_length, CHECK); 3365 cfs->guarantee_more(4, CHECK); // class_index, method_index 3366 enclosing_method_class_index = cfs->get_u2_fast(); 3367 enclosing_method_method_index = cfs->get_u2_fast(); 3368 if (enclosing_method_class_index == 0) { 3369 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 3370 } 3371 // Validate the constant pool indices and types 3372 check_property(valid_klass_reference_at(enclosing_method_class_index), 3373 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3374 if (enclosing_method_method_index != 0 && 3375 (!cp->is_within_bounds(enclosing_method_method_index) || 3376 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3377 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3378 } 3379 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3380 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3381 if (parsed_bootstrap_methods_attribute) { 3382 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3383 } 3384 parsed_bootstrap_methods_attribute = true; 3385 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); 3386 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3387 if (runtime_visible_type_annotations != NULL) { 3388 classfile_parse_error( 3389 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3390 } 3391 runtime_visible_type_annotations_length = attribute_length; 3392 runtime_visible_type_annotations = cfs->get_u1_buffer(); 3393 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3394 // No need for the VM to parse Type annotations 3395 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3396 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3397 if (runtime_invisible_type_annotations_exists) { 3398 classfile_parse_error( 3399 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3400 } else { 3401 runtime_invisible_type_annotations_exists = true; 3402 } 3403 if (PreserveAllAnnotations) { 3404 runtime_invisible_type_annotations_length = attribute_length; 3405 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 3406 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3407 } 3408 cfs->skip_u1(attribute_length, CHECK); 3409 } else { 3410 // Unknown attribute 3411 cfs->skip_u1(attribute_length, CHECK); 3412 } 3413 } else { 3414 // Unknown attribute 3415 cfs->skip_u1(attribute_length, CHECK); 3416 } 3417 } 3418 _annotations = assemble_annotations(runtime_visible_annotations, 3419 runtime_visible_annotations_length, 3420 runtime_invisible_annotations, 3421 runtime_invisible_annotations_length, 3422 CHECK); 3423 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 3424 runtime_visible_type_annotations_length, 3425 runtime_invisible_type_annotations, 3426 runtime_invisible_type_annotations_length, 3427 CHECK); 3428 3429 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3430 const u2 num_of_classes = parse_classfile_inner_classes_attribute( 3431 cfs, 3432 inner_classes_attribute_start, 3433 parsed_innerclasses_attribute, 3434 enclosing_method_class_index, 3435 enclosing_method_method_index, 3436 CHECK); 3437 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { 3438 guarantee_property( 3439 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3440 "Wrong InnerClasses attribute length in class file %s", CHECK); 3441 } 3442 } 3443 3444 if (_max_bootstrap_specifier_index >= 0) { 3445 guarantee_property(parsed_bootstrap_methods_attribute, 3446 "Missing BootstrapMethods attribute in class file %s", CHECK); 3447 } 3448} 3449 3450void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { 3451 assert(k != NULL, "invariant"); 3452 3453 if (_synthetic_flag) 3454 k->set_is_synthetic(); 3455 if (_sourcefile_index != 0) { 3456 k->set_source_file_name_index(_sourcefile_index); 3457 } 3458 if (_generic_signature_index != 0) { 3459 k->set_generic_signature_index(_generic_signature_index); 3460 } 3461 if (_sde_buffer != NULL) { 3462 k->set_source_debug_extension(_sde_buffer, _sde_length); 3463 } 3464} 3465 3466// Create the Annotations object that will 3467// hold the annotations array for the Klass. 3468void ClassFileParser::create_combined_annotations(TRAPS) { 3469 if (_annotations == NULL && 3470 _type_annotations == NULL && 3471 _fields_annotations == NULL && 3472 _fields_type_annotations == NULL) { 3473 // Don't create the Annotations object unnecessarily. 3474 return; 3475 } 3476 3477 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); 3478 annotations->set_class_annotations(_annotations); 3479 annotations->set_class_type_annotations(_type_annotations); 3480 annotations->set_fields_annotations(_fields_annotations); 3481 annotations->set_fields_type_annotations(_fields_type_annotations); 3482 3483 // This is the Annotations object that will be 3484 // assigned to InstanceKlass being constructed. 3485 _combined_annotations = annotations; 3486 3487 // The annotations arrays below has been transfered the 3488 // _combined_annotations so these fields can now be cleared. 3489 _annotations = NULL; 3490 _type_annotations = NULL; 3491 _fields_annotations = NULL; 3492 _fields_type_annotations = NULL; 3493} 3494 3495// Transfer ownership of metadata allocated to the InstanceKlass. 3496void ClassFileParser::apply_parsed_class_metadata( 3497 InstanceKlass* this_klass, 3498 int java_fields_count, TRAPS) { 3499 assert(this_klass != NULL, "invariant"); 3500 3501 _cp->set_pool_holder(this_klass); 3502 this_klass->set_constants(_cp); 3503 this_klass->set_fields(_fields, java_fields_count); 3504 this_klass->set_methods(_methods); 3505 this_klass->set_inner_classes(_inner_classes); 3506 this_klass->set_local_interfaces(_local_interfaces); 3507 this_klass->set_transitive_interfaces(_transitive_interfaces); 3508 this_klass->set_annotations(_combined_annotations); 3509 3510 // Clear out these fields so they don't get deallocated by the destructor 3511 clear_class_metadata(); 3512} 3513 3514AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations, 3515 int runtime_visible_annotations_length, 3516 const u1* const runtime_invisible_annotations, 3517 int runtime_invisible_annotations_length, 3518 TRAPS) { 3519 AnnotationArray* annotations = NULL; 3520 if (runtime_visible_annotations != NULL || 3521 runtime_invisible_annotations != NULL) { 3522 annotations = MetadataFactory::new_array<u1>(_loader_data, 3523 runtime_visible_annotations_length + 3524 runtime_invisible_annotations_length, 3525 CHECK_(annotations)); 3526 if (runtime_visible_annotations != NULL) { 3527 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3528 annotations->at_put(i, runtime_visible_annotations[i]); 3529 } 3530 } 3531 if (runtime_invisible_annotations != NULL) { 3532 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3533 int append = runtime_visible_annotations_length+i; 3534 annotations->at_put(append, runtime_invisible_annotations[i]); 3535 } 3536 } 3537 } 3538 return annotations; 3539} 3540 3541const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp, 3542 const int super_class_index, 3543 const bool need_verify, 3544 TRAPS) { 3545 assert(cp != NULL, "invariant"); 3546 const InstanceKlass* super_klass = NULL; 3547 3548 if (super_class_index == 0) { 3549 check_property(_class_name == vmSymbols::java_lang_Object(), 3550 "Invalid superclass index %u in class file %s", 3551 super_class_index, 3552 CHECK_NULL); 3553 } else { 3554 check_property(valid_klass_reference_at(super_class_index), 3555 "Invalid superclass index %u in class file %s", 3556 super_class_index, 3557 CHECK_NULL); 3558 // The class name should be legal because it is checked when parsing constant pool. 3559 // However, make sure it is not an array type. 3560 bool is_array = false; 3561 if (cp->tag_at(super_class_index).is_klass()) { 3562 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index)); 3563 if (need_verify) 3564 is_array = super_klass->is_array_klass(); 3565 } else if (need_verify) { 3566 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3567 } 3568 if (need_verify) { 3569 guarantee_property(!is_array, 3570 "Bad superclass name in class file %s", CHECK_NULL); 3571 } 3572 } 3573 return super_klass; 3574} 3575 3576static unsigned int compute_oop_map_count(const InstanceKlass* super, 3577 unsigned int nonstatic_oop_map_count, 3578 int first_nonstatic_oop_offset) { 3579 3580 unsigned int map_count = 3581 NULL == super ? 0 : super->nonstatic_oop_map_count(); 3582 if (nonstatic_oop_map_count > 0) { 3583 // We have oops to add to map 3584 if (map_count == 0) { 3585 map_count = nonstatic_oop_map_count; 3586 } 3587 else { 3588 // Check whether we should add a new map block or whether the last one can 3589 // be extended 3590 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 3591 const OopMapBlock* const last_map = first_map + map_count - 1; 3592 3593 const int next_offset = last_map->offset() + last_map->count() * heapOopSize; 3594 if (next_offset == first_nonstatic_oop_offset) { 3595 // There is no gap bettwen superklass's last oop field and first 3596 // local oop field, merge maps. 3597 nonstatic_oop_map_count -= 1; 3598 } 3599 else { 3600 // Superklass didn't end with a oop field, add extra maps 3601 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 3602 } 3603 map_count += nonstatic_oop_map_count; 3604 } 3605 } 3606 return map_count; 3607} 3608 3609#ifndef PRODUCT 3610static void print_field_layout(const Symbol* name, 3611 Array<u2>* fields, 3612 constantPoolHandle cp, 3613 int instance_size, 3614 int instance_fields_start, 3615 int instance_fields_end, 3616 int static_fields_end) { 3617 3618 assert(name != NULL, "invariant"); 3619 3620 tty->print("%s: field layout\n", name->as_klass_external_name()); 3621 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 3622 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3623 if (!fs.access_flags().is_static()) { 3624 tty->print(" @%3d \"%s\" %s\n", 3625 fs.offset(), 3626 fs.name()->as_klass_external_name(), 3627 fs.signature()->as_klass_external_name()); 3628 } 3629 } 3630 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 3631 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 3632 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 3633 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3634 if (fs.access_flags().is_static()) { 3635 tty->print(" @%3d \"%s\" %s\n", 3636 fs.offset(), 3637 fs.name()->as_klass_external_name(), 3638 fs.signature()->as_klass_external_name()); 3639 } 3640 } 3641 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 3642 tty->print("\n"); 3643} 3644#endif 3645 3646// Values needed for oopmap and InstanceKlass creation 3647class ClassFileParser::FieldLayoutInfo : public ResourceObj { 3648 public: 3649 int* nonstatic_oop_offsets; 3650 unsigned int* nonstatic_oop_counts; 3651 unsigned int nonstatic_oop_map_count; 3652 unsigned int total_oop_map_count; 3653 int instance_size; 3654 int nonstatic_field_size; 3655 int static_field_size; 3656 bool has_nonstatic_fields; 3657}; 3658 3659// Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3660void ClassFileParser::layout_fields(ConstantPool* cp, 3661 const FieldAllocationCount* fac, 3662 const ClassAnnotationCollector* parsed_annotations, 3663 FieldLayoutInfo* info, 3664 TRAPS) { 3665 3666 assert(cp != NULL, "invariant"); 3667 3668 // Field size and offset computation 3669 int nonstatic_field_size = _super_klass == NULL ? 0 : 3670 _super_klass->nonstatic_field_size(); 3671 3672 // Count the contended fields by type. 3673 // 3674 // We ignore static fields, because @Contended is not supported for them. 3675 // The layout code below will also ignore the static fields. 3676 int nonstatic_contended_count = 0; 3677 FieldAllocationCount fac_contended; 3678 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 3679 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3680 if (fs.is_contended()) { 3681 fac_contended.count[atype]++; 3682 if (!fs.access_flags().is_static()) { 3683 nonstatic_contended_count++; 3684 } 3685 } 3686 } 3687 3688 3689 // Calculate the starting byte offsets 3690 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3691 int next_static_double_offset = next_static_oop_offset + 3692 ((fac->count[STATIC_OOP]) * heapOopSize); 3693 if ( fac->count[STATIC_DOUBLE] && 3694 (Universe::field_type_should_be_aligned(T_DOUBLE) || 3695 Universe::field_type_should_be_aligned(T_LONG)) ) { 3696 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 3697 } 3698 3699 int next_static_word_offset = next_static_double_offset + 3700 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3701 int next_static_short_offset = next_static_word_offset + 3702 ((fac->count[STATIC_WORD]) * BytesPerInt); 3703 int next_static_byte_offset = next_static_short_offset + 3704 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3705 3706 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3707 nonstatic_field_size * heapOopSize; 3708 3709 int next_nonstatic_field_offset = nonstatic_fields_start; 3710 3711 const bool is_contended_class = parsed_annotations->is_contended(); 3712 3713 // Class is contended, pad before all the fields 3714 if (is_contended_class) { 3715 next_nonstatic_field_offset += ContendedPaddingWidth; 3716 } 3717 3718 // Compute the non-contended fields count. 3719 // The packing code below relies on these counts to determine if some field 3720 // can be squeezed into the alignment gap. Contended fields are obviously 3721 // exempt from that. 3722 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3723 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3724 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3725 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3726 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3727 3728 // Total non-static fields count, including every contended field 3729 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 3730 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 3731 fac->count[NONSTATIC_OOP]; 3732 3733 const bool super_has_nonstatic_fields = 3734 (_super_klass != NULL && _super_klass->has_nonstatic_fields()); 3735 const bool has_nonstatic_fields = 3736 super_has_nonstatic_fields || (nonstatic_fields_count != 0); 3737 3738 3739 // Prepare list of oops for oop map generation. 3740 // 3741 // "offset" and "count" lists are describing the set of contiguous oop 3742 // regions. offset[i] is the start of the i-th region, which then has 3743 // count[i] oops following. Before we know how many regions are required, 3744 // we pessimistically allocate the maps to fit all the oops into the 3745 // distinct regions. 3746 // 3747 // TODO: We add +1 to always allocate non-zero resource arrays; we need 3748 // to figure out if we still need to do this. 3749 unsigned int nonstatic_oop_map_count = 0; 3750 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 3751 3752 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3753 THREAD, int, max_nonstatic_oop_maps); 3754 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3755 THREAD, unsigned int, max_nonstatic_oop_maps); 3756 3757 int first_nonstatic_oop_offset = 0; // will be set for first oop field 3758 3759 bool compact_fields = CompactFields; 3760 int allocation_style = FieldsAllocationStyle; 3761 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3762 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3763 allocation_style = 1; // Optimistic 3764 } 3765 3766 // The next classes have predefined hard-coded fields offsets 3767 // (see in JavaClasses::compute_hard_coded_offsets()). 3768 // Use default fields allocation order for them. 3769 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL && 3770 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3771 _class_name == vmSymbols::java_lang_Class() || 3772 _class_name == vmSymbols::java_lang_ClassLoader() || 3773 _class_name == vmSymbols::java_lang_ref_Reference() || 3774 _class_name == vmSymbols::java_lang_ref_SoftReference() || 3775 _class_name == vmSymbols::java_lang_StackTraceElement() || 3776 _class_name == vmSymbols::java_lang_String() || 3777 _class_name == vmSymbols::java_lang_Throwable() || 3778 _class_name == vmSymbols::java_lang_Boolean() || 3779 _class_name == vmSymbols::java_lang_Character() || 3780 _class_name == vmSymbols::java_lang_Float() || 3781 _class_name == vmSymbols::java_lang_Double() || 3782 _class_name == vmSymbols::java_lang_Byte() || 3783 _class_name == vmSymbols::java_lang_Short() || 3784 _class_name == vmSymbols::java_lang_Integer() || 3785 _class_name == vmSymbols::java_lang_Long())) { 3786 allocation_style = 0; // Allocate oops first 3787 compact_fields = false; // Don't compact fields 3788 } 3789 3790 int next_nonstatic_oop_offset = 0; 3791 int next_nonstatic_double_offset = 0; 3792 3793 // Rearrange fields for a given allocation style 3794 if( allocation_style == 0 ) { 3795 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 3796 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3797 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3798 (nonstatic_oop_count * heapOopSize); 3799 } else if( allocation_style == 1 ) { 3800 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 3801 next_nonstatic_double_offset = next_nonstatic_field_offset; 3802 } else if( allocation_style == 2 ) { 3803 // Fields allocation: oops fields in super and sub classes are together. 3804 if( nonstatic_field_size > 0 && _super_klass != NULL && 3805 _super_klass->nonstatic_oop_map_size() > 0 ) { 3806 const unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 3807 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps(); 3808 const OopMapBlock* const last_map = first_map + map_count - 1; 3809 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3810 if (next_offset == next_nonstatic_field_offset) { 3811 allocation_style = 0; // allocate oops first 3812 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3813 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3814 (nonstatic_oop_count * heapOopSize); 3815 } 3816 } 3817 if( allocation_style == 2 ) { 3818 allocation_style = 1; // allocate oops last 3819 next_nonstatic_double_offset = next_nonstatic_field_offset; 3820 } 3821 } else { 3822 ShouldNotReachHere(); 3823 } 3824 3825 int nonstatic_oop_space_count = 0; 3826 int nonstatic_word_space_count = 0; 3827 int nonstatic_short_space_count = 0; 3828 int nonstatic_byte_space_count = 0; 3829 int nonstatic_oop_space_offset = 0; 3830 int nonstatic_word_space_offset = 0; 3831 int nonstatic_short_space_offset = 0; 3832 int nonstatic_byte_space_offset = 0; 3833 3834 // Try to squeeze some of the fields into the gaps due to 3835 // long/double alignment. 3836 if (nonstatic_double_count > 0) { 3837 int offset = next_nonstatic_double_offset; 3838 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3839 if (compact_fields && offset != next_nonstatic_double_offset) { 3840 // Allocate available fields into the gap before double field. 3841 int length = next_nonstatic_double_offset - offset; 3842 assert(length == BytesPerInt, ""); 3843 nonstatic_word_space_offset = offset; 3844 if (nonstatic_word_count > 0) { 3845 nonstatic_word_count -= 1; 3846 nonstatic_word_space_count = 1; // Only one will fit 3847 length -= BytesPerInt; 3848 offset += BytesPerInt; 3849 } 3850 nonstatic_short_space_offset = offset; 3851 while (length >= BytesPerShort && nonstatic_short_count > 0) { 3852 nonstatic_short_count -= 1; 3853 nonstatic_short_space_count += 1; 3854 length -= BytesPerShort; 3855 offset += BytesPerShort; 3856 } 3857 nonstatic_byte_space_offset = offset; 3858 while (length > 0 && nonstatic_byte_count > 0) { 3859 nonstatic_byte_count -= 1; 3860 nonstatic_byte_space_count += 1; 3861 length -= 1; 3862 } 3863 // Allocate oop field in the gap if there are no other fields for that. 3864 nonstatic_oop_space_offset = offset; 3865 if (length >= heapOopSize && nonstatic_oop_count > 0 && 3866 allocation_style != 0) { // when oop fields not first 3867 nonstatic_oop_count -= 1; 3868 nonstatic_oop_space_count = 1; // Only one will fit 3869 length -= heapOopSize; 3870 offset += heapOopSize; 3871 } 3872 } 3873 } 3874 3875 int next_nonstatic_word_offset = next_nonstatic_double_offset + 3876 (nonstatic_double_count * BytesPerLong); 3877 int next_nonstatic_short_offset = next_nonstatic_word_offset + 3878 (nonstatic_word_count * BytesPerInt); 3879 int next_nonstatic_byte_offset = next_nonstatic_short_offset + 3880 (nonstatic_short_count * BytesPerShort); 3881 int next_nonstatic_padded_offset = next_nonstatic_byte_offset + 3882 nonstatic_byte_count; 3883 3884 // let oops jump before padding with this allocation style 3885 if( allocation_style == 1 ) { 3886 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 3887 if( nonstatic_oop_count > 0 ) { 3888 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3889 } 3890 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3891 } 3892 3893 // Iterate over fields again and compute correct offsets. 3894 // The field allocation type was temporarily stored in the offset slot. 3895 // oop fields are located before non-oop fields (static and non-static). 3896 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 3897 3898 // skip already laid out fields 3899 if (fs.is_offset_set()) continue; 3900 3901 // contended instance fields are handled below 3902 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 3903 3904 int real_offset = 0; 3905 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type(); 3906 3907 // pack the rest of the fields 3908 switch (atype) { 3909 case STATIC_OOP: 3910 real_offset = next_static_oop_offset; 3911 next_static_oop_offset += heapOopSize; 3912 break; 3913 case STATIC_BYTE: 3914 real_offset = next_static_byte_offset; 3915 next_static_byte_offset += 1; 3916 break; 3917 case STATIC_SHORT: 3918 real_offset = next_static_short_offset; 3919 next_static_short_offset += BytesPerShort; 3920 break; 3921 case STATIC_WORD: 3922 real_offset = next_static_word_offset; 3923 next_static_word_offset += BytesPerInt; 3924 break; 3925 case STATIC_DOUBLE: 3926 real_offset = next_static_double_offset; 3927 next_static_double_offset += BytesPerLong; 3928 break; 3929 case NONSTATIC_OOP: 3930 if( nonstatic_oop_space_count > 0 ) { 3931 real_offset = nonstatic_oop_space_offset; 3932 nonstatic_oop_space_offset += heapOopSize; 3933 nonstatic_oop_space_count -= 1; 3934 } else { 3935 real_offset = next_nonstatic_oop_offset; 3936 next_nonstatic_oop_offset += heapOopSize; 3937 } 3938 3939 // Record this oop in the oop maps 3940 if( nonstatic_oop_map_count > 0 && 3941 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3942 real_offset - 3943 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3944 heapOopSize ) { 3945 // This oop is adjacent to the previous one, add to current oop map 3946 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3947 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3948 } else { 3949 // This oop is not adjacent to the previous one, create new oop map 3950 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3951 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3952 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3953 nonstatic_oop_map_count += 1; 3954 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3955 first_nonstatic_oop_offset = real_offset; 3956 } 3957 } 3958 break; 3959 case NONSTATIC_BYTE: 3960 if( nonstatic_byte_space_count > 0 ) { 3961 real_offset = nonstatic_byte_space_offset; 3962 nonstatic_byte_space_offset += 1; 3963 nonstatic_byte_space_count -= 1; 3964 } else { 3965 real_offset = next_nonstatic_byte_offset; 3966 next_nonstatic_byte_offset += 1; 3967 } 3968 break; 3969 case NONSTATIC_SHORT: 3970 if( nonstatic_short_space_count > 0 ) { 3971 real_offset = nonstatic_short_space_offset; 3972 nonstatic_short_space_offset += BytesPerShort; 3973 nonstatic_short_space_count -= 1; 3974 } else { 3975 real_offset = next_nonstatic_short_offset; 3976 next_nonstatic_short_offset += BytesPerShort; 3977 } 3978 break; 3979 case NONSTATIC_WORD: 3980 if( nonstatic_word_space_count > 0 ) { 3981 real_offset = nonstatic_word_space_offset; 3982 nonstatic_word_space_offset += BytesPerInt; 3983 nonstatic_word_space_count -= 1; 3984 } else { 3985 real_offset = next_nonstatic_word_offset; 3986 next_nonstatic_word_offset += BytesPerInt; 3987 } 3988 break; 3989 case NONSTATIC_DOUBLE: 3990 real_offset = next_nonstatic_double_offset; 3991 next_nonstatic_double_offset += BytesPerLong; 3992 break; 3993 default: 3994 ShouldNotReachHere(); 3995 } 3996 fs.set_offset(real_offset); 3997 } 3998 3999 4000 // Handle the contended cases. 4001 // 4002 // Each contended field should not intersect the cache line with another contended field. 4003 // In the absence of alignment information, we end up with pessimistically separating 4004 // the fields with full-width padding. 4005 // 4006 // Additionally, this should not break alignment for the fields, so we round the alignment up 4007 // for each field. 4008 if (nonstatic_contended_count > 0) { 4009 4010 // if there is at least one contended field, we need to have pre-padding for them 4011 next_nonstatic_padded_offset += ContendedPaddingWidth; 4012 4013 // collect all contended groups 4014 ResourceBitMap bm(cp->size()); 4015 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4016 // skip already laid out fields 4017 if (fs.is_offset_set()) continue; 4018 4019 if (fs.is_contended()) { 4020 bm.set_bit(fs.contended_group()); 4021 } 4022 } 4023 4024 int current_group = -1; 4025 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 4026 4027 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4028 4029 // skip already laid out fields 4030 if (fs.is_offset_set()) continue; 4031 4032 // skip non-contended fields and fields from different group 4033 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 4034 4035 // handle statics below 4036 if (fs.access_flags().is_static()) continue; 4037 4038 int real_offset = 0; 4039 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 4040 4041 switch (atype) { 4042 case NONSTATIC_BYTE: 4043 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1); 4044 real_offset = next_nonstatic_padded_offset; 4045 next_nonstatic_padded_offset += 1; 4046 break; 4047 4048 case NONSTATIC_SHORT: 4049 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort); 4050 real_offset = next_nonstatic_padded_offset; 4051 next_nonstatic_padded_offset += BytesPerShort; 4052 break; 4053 4054 case NONSTATIC_WORD: 4055 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt); 4056 real_offset = next_nonstatic_padded_offset; 4057 next_nonstatic_padded_offset += BytesPerInt; 4058 break; 4059 4060 case NONSTATIC_DOUBLE: 4061 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong); 4062 real_offset = next_nonstatic_padded_offset; 4063 next_nonstatic_padded_offset += BytesPerLong; 4064 break; 4065 4066 case NONSTATIC_OOP: 4067 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize); 4068 real_offset = next_nonstatic_padded_offset; 4069 next_nonstatic_padded_offset += heapOopSize; 4070 4071 // Record this oop in the oop maps 4072 if( nonstatic_oop_map_count > 0 && 4073 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 4074 real_offset - 4075 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 4076 heapOopSize ) { 4077 // This oop is adjacent to the previous one, add to current oop map 4078 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 4079 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 4080 } else { 4081 // This oop is not adjacent to the previous one, create new oop map 4082 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 4083 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 4084 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 4085 nonstatic_oop_map_count += 1; 4086 if( first_nonstatic_oop_offset == 0 ) { // Undefined 4087 first_nonstatic_oop_offset = real_offset; 4088 } 4089 } 4090 break; 4091 4092 default: 4093 ShouldNotReachHere(); 4094 } 4095 4096 if (fs.contended_group() == 0) { 4097 // Contended group defines the equivalence class over the fields: 4098 // the fields within the same contended group are not inter-padded. 4099 // The only exception is default group, which does not incur the 4100 // equivalence, and so requires intra-padding. 4101 next_nonstatic_padded_offset += ContendedPaddingWidth; 4102 } 4103 4104 fs.set_offset(real_offset); 4105 } // for 4106 4107 // Start laying out the next group. 4108 // Note that this will effectively pad the last group in the back; 4109 // this is expected to alleviate memory contention effects for 4110 // subclass fields and/or adjacent object. 4111 // If this was the default group, the padding is already in place. 4112 if (current_group != 0) { 4113 next_nonstatic_padded_offset += ContendedPaddingWidth; 4114 } 4115 } 4116 4117 // handle static fields 4118 } 4119 4120 // Entire class is contended, pad in the back. 4121 // This helps to alleviate memory contention effects for subclass fields 4122 // and/or adjacent object. 4123 if (is_contended_class) { 4124 next_nonstatic_padded_offset += ContendedPaddingWidth; 4125 } 4126 4127 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 4128 4129 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize); 4130 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize); 4131 int static_fields_end = align_size_up(next_static_byte_offset, wordSize); 4132 4133 int static_field_size = (static_fields_end - 4134 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 4135 nonstatic_field_size = nonstatic_field_size + 4136 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 4137 4138 int instance_size = align_object_size(instance_end / wordSize); 4139 4140 assert(instance_size == align_object_size(align_size_up( 4141 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 4142 wordSize) / wordSize), "consistent layout helper value"); 4143 4144 // Invariant: nonstatic_field end/start should only change if there are 4145 // nonstatic fields in the class, or if the class is contended. We compare 4146 // against the non-aligned value, so that end alignment will not fail the 4147 // assert without actually having the fields. 4148 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 4149 is_contended_class || 4150 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 4151 4152 // Number of non-static oop map blocks allocated at end of klass. 4153 const unsigned int total_oop_map_count = 4154 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 4155 first_nonstatic_oop_offset); 4156 4157#ifndef PRODUCT 4158 if (PrintFieldLayout) { 4159 print_field_layout(_class_name, 4160 _fields, 4161 cp, 4162 instance_size, 4163 nonstatic_fields_start, 4164 nonstatic_fields_end, 4165 static_fields_end); 4166 } 4167 4168#endif 4169 // Pass back information needed for InstanceKlass creation 4170 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 4171 info->nonstatic_oop_counts = nonstatic_oop_counts; 4172 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 4173 info->total_oop_map_count = total_oop_map_count; 4174 info->instance_size = instance_size; 4175 info->static_field_size = static_field_size; 4176 info->nonstatic_field_size = nonstatic_field_size; 4177 info->has_nonstatic_fields = has_nonstatic_fields; 4178} 4179 4180static void fill_oop_maps(const InstanceKlass* k, 4181 unsigned int nonstatic_oop_map_count, 4182 const int* nonstatic_oop_offsets, 4183 const unsigned int* nonstatic_oop_counts) { 4184 4185 assert(k != NULL, "invariant"); 4186 4187 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4188 const InstanceKlass* const super = k->superklass(); 4189 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4190 if (super_count > 0) { 4191 // Copy maps from superklass 4192 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4193 for (unsigned int i = 0; i < super_count; ++i) { 4194 *this_oop_map++ = *super_oop_map++; 4195 } 4196 } 4197 4198 if (nonstatic_oop_map_count > 0) { 4199 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4200 // The counts differ because there is no gap between superklass's last oop 4201 // field and the first local oop field. Extend the last oop map copied 4202 // from the superklass instead of creating new one. 4203 nonstatic_oop_map_count--; 4204 nonstatic_oop_offsets++; 4205 this_oop_map--; 4206 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4207 this_oop_map++; 4208 } 4209 4210 // Add new map blocks, fill them 4211 while (nonstatic_oop_map_count-- > 0) { 4212 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4213 this_oop_map->set_count(*nonstatic_oop_counts++); 4214 this_oop_map++; 4215 } 4216 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4217 this_oop_map, "sanity"); 4218 } 4219} 4220 4221 4222void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) { 4223 assert(ik != NULL, "invariant"); 4224 4225 const Klass* const super = ik->super(); 4226 4227 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4228 // in which case we don't have to register objects as finalizable 4229 if (!_has_empty_finalizer) { 4230 if (_has_finalizer || 4231 (super != NULL && super->has_finalizer())) { 4232 ik->set_has_finalizer(); 4233 } 4234 } 4235 4236#ifdef ASSERT 4237 bool f = false; 4238 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), 4239 vmSymbols::void_method_signature()); 4240 if (m != NULL && !m->is_empty_method()) { 4241 f = true; 4242 } 4243 4244 // Spec doesn't prevent agent from redefinition of empty finalizer. 4245 // Despite the fact that it's generally bad idea and redefined finalizer 4246 // will not work as expected we shouldn't abort vm in this case 4247 if (!ik->has_redefined_this_or_super()) { 4248 assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); 4249 } 4250#endif 4251 4252 // Check if this klass supports the java.lang.Cloneable interface 4253 if (SystemDictionary::Cloneable_klass_loaded()) { 4254 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4255 ik->set_is_cloneable(); 4256 } 4257 } 4258 4259 // Check if this klass has a vanilla default constructor 4260 if (super == NULL) { 4261 // java.lang.Object has empty default constructor 4262 ik->set_has_vanilla_constructor(); 4263 } else { 4264 if (super->has_vanilla_constructor() && 4265 _has_vanilla_constructor) { 4266 ik->set_has_vanilla_constructor(); 4267 } 4268#ifdef ASSERT 4269 bool v = false; 4270 if (super->has_vanilla_constructor()) { 4271 const Method* const constructor = 4272 ik->find_method(vmSymbols::object_initializer_name(), 4273 vmSymbols::void_method_signature()); 4274 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4275 v = true; 4276 } 4277 } 4278 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4279#endif 4280 } 4281 4282 // If it cannot be fast-path allocated, set a bit in the layout helper. 4283 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4284 assert(ik->size_helper() > 0, "layout_helper is initialized"); 4285 if ((!RegisterFinalizersAtInit && ik->has_finalizer()) 4286 || ik->is_abstract() || ik->is_interface() 4287 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL) 4288 || ik->size_helper() >= FastAllocateSizeLimit) { 4289 // Forbid fast-path allocation. 4290 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); 4291 ik->set_layout_helper(lh); 4292 } 4293} 4294 4295// Attach super classes and interface classes to class loader data 4296static void record_defined_class_dependencies(const InstanceKlass* defined_klass, 4297 TRAPS) { 4298 assert(defined_klass != NULL, "invariant"); 4299 4300 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data(); 4301 if (defining_loader_data->is_the_null_class_loader_data()) { 4302 // Dependencies to null class loader data are implicit. 4303 return; 4304 } else { 4305 // add super class dependency 4306 Klass* const super = defined_klass->super(); 4307 if (super != NULL) { 4308 defining_loader_data->record_dependency(super, CHECK); 4309 } 4310 4311 // add super interface dependencies 4312 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces(); 4313 if (local_interfaces != NULL) { 4314 const int length = local_interfaces->length(); 4315 for (int i = 0; i < length; i++) { 4316 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK); 4317 } 4318 } 4319 } 4320} 4321 4322// utility methods for appending an array with check for duplicates 4323 4324static void append_interfaces(GrowableArray<Klass*>* result, 4325 const Array<Klass*>* const ifs) { 4326 // iterate over new interfaces 4327 for (int i = 0; i < ifs->length(); i++) { 4328 Klass* const e = ifs->at(i); 4329 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); 4330 // add new interface 4331 result->append_if_missing(e); 4332 } 4333} 4334 4335static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super, 4336 Array<Klass*>* local_ifs, 4337 ClassLoaderData* loader_data, 4338 TRAPS) { 4339 assert(local_ifs != NULL, "invariant"); 4340 assert(loader_data != NULL, "invariant"); 4341 4342 // Compute maximum size for transitive interfaces 4343 int max_transitive_size = 0; 4344 int super_size = 0; 4345 // Add superclass transitive interfaces size 4346 if (super != NULL) { 4347 super_size = super->transitive_interfaces()->length(); 4348 max_transitive_size += super_size; 4349 } 4350 // Add local interfaces' super interfaces 4351 const int local_size = local_ifs->length(); 4352 for (int i = 0; i < local_size; i++) { 4353 Klass* const l = local_ifs->at(i); 4354 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); 4355 } 4356 // Finally add local interfaces 4357 max_transitive_size += local_size; 4358 // Construct array 4359 if (max_transitive_size == 0) { 4360 // no interfaces, use canonicalized array 4361 return Universe::the_empty_klass_array(); 4362 } else if (max_transitive_size == super_size) { 4363 // no new local interfaces added, share superklass' transitive interface array 4364 return super->transitive_interfaces(); 4365 } else if (max_transitive_size == local_size) { 4366 // only local interfaces added, share local interface array 4367 return local_ifs; 4368 } else { 4369 ResourceMark rm; 4370 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size); 4371 4372 // Copy down from superclass 4373 if (super != NULL) { 4374 append_interfaces(result, super->transitive_interfaces()); 4375 } 4376 4377 // Copy down from local interfaces' superinterfaces 4378 for (int i = 0; i < local_size; i++) { 4379 Klass* const l = local_ifs->at(i); 4380 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); 4381 } 4382 // Finally add local interfaces 4383 append_interfaces(result, local_ifs); 4384 4385 // length will be less than the max_transitive_size if duplicates were removed 4386 const int length = result->length(); 4387 assert(length <= max_transitive_size, "just checking"); 4388 Array<Klass*>* const new_result = 4389 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL); 4390 for (int i = 0; i < length; i++) { 4391 Klass* const e = result->at(i); 4392 assert(e != NULL, "just checking"); 4393 new_result->at_put(i, e); 4394 } 4395 return new_result; 4396 } 4397} 4398 4399static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) { 4400 assert(this_klass != NULL, "invariant"); 4401 const Klass* const super = this_klass->super(); 4402 if (super != NULL) { 4403 4404 // If the loader is not the boot loader then throw an exception if its 4405 // superclass is in package jdk.internal.reflect and its loader is not a 4406 // special reflection class loader 4407 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) { 4408 assert(super->is_instance_klass(), "super is not instance klass"); 4409 PackageEntry* super_package = super->package(); 4410 if (super_package != NULL && 4411 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 && 4412 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) { 4413 ResourceMark rm(THREAD); 4414 Exceptions::fthrow( 4415 THREAD_AND_LOCATION, 4416 vmSymbols::java_lang_IllegalAccessError(), 4417 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s", 4418 this_klass->external_name(), 4419 this_klass->class_loader_data()->loader_name(), 4420 super->external_name()); 4421 return; 4422 } 4423 } 4424 4425 Reflection::VerifyClassAccessResults vca_result = 4426 Reflection::verify_class_access(this_klass, super, false); 4427 if (vca_result != Reflection::ACCESS_OK) { 4428 ResourceMark rm(THREAD); 4429 char* msg = Reflection::verify_class_access_msg(this_klass, super, vca_result); 4430 if (msg == NULL) { 4431 Exceptions::fthrow( 4432 THREAD_AND_LOCATION, 4433 vmSymbols::java_lang_IllegalAccessError(), 4434 "class %s cannot access its superclass %s", 4435 this_klass->external_name(), 4436 super->external_name()); 4437 } else { 4438 // Add additional message content. 4439 Exceptions::fthrow( 4440 THREAD_AND_LOCATION, 4441 vmSymbols::java_lang_IllegalAccessError(), 4442 "superclass access check failed: %s", 4443 msg); 4444 } 4445 } 4446 } 4447} 4448 4449 4450static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { 4451 assert(this_klass != NULL, "invariant"); 4452 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces(); 4453 const int lng = local_interfaces->length(); 4454 for (int i = lng - 1; i >= 0; i--) { 4455 Klass* const k = local_interfaces->at(i); 4456 assert (k != NULL && k->is_interface(), "invalid interface"); 4457 Reflection::VerifyClassAccessResults vca_result = 4458 Reflection::verify_class_access(this_klass, k, false); 4459 if (vca_result != Reflection::ACCESS_OK) { 4460 ResourceMark rm(THREAD); 4461 char* msg = Reflection::verify_class_access_msg(this_klass, k, vca_result); 4462 if (msg == NULL) { 4463 Exceptions::fthrow( 4464 THREAD_AND_LOCATION, 4465 vmSymbols::java_lang_IllegalAccessError(), 4466 "class %s cannot access its superinterface %s", 4467 this_klass->external_name(), 4468 k->external_name()); 4469 } else { 4470 // Add additional message content. 4471 Exceptions::fthrow( 4472 THREAD_AND_LOCATION, 4473 vmSymbols::java_lang_IllegalAccessError(), 4474 "superinterface check failed: %s", 4475 msg); 4476 } 4477 } 4478 } 4479} 4480 4481 4482static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { 4483 assert(this_klass != NULL, "invariant"); 4484 const Array<Method*>* const methods = this_klass->methods(); 4485 const int num_methods = methods->length(); 4486 4487 // go thru each method and check if it overrides a final method 4488 for (int index = 0; index < num_methods; index++) { 4489 const Method* const m = methods->at(index); 4490 4491 // skip private, static, and <init> methods 4492 if ((!m->is_private() && !m->is_static()) && 4493 (m->name() != vmSymbols::object_initializer_name())) { 4494 4495 const Symbol* const name = m->name(); 4496 const Symbol* const signature = m->signature(); 4497 const Klass* k = this_klass->super(); 4498 const Method* super_m = NULL; 4499 while (k != NULL) { 4500 // skip supers that don't have final methods. 4501 if (k->has_final_method()) { 4502 // lookup a matching method in the super class hierarchy 4503 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4504 if (super_m == NULL) { 4505 break; // didn't find any match; get out 4506 } 4507 4508 if (super_m->is_final() && !super_m->is_static() && 4509 // matching method in super is final, and not static 4510 (Reflection::verify_field_access(this_klass, 4511 super_m->method_holder(), 4512 super_m->method_holder(), 4513 super_m->access_flags(), false)) 4514 // this class can access super final method and therefore override 4515 ) { 4516 ResourceMark rm(THREAD); 4517 Exceptions::fthrow( 4518 THREAD_AND_LOCATION, 4519 vmSymbols::java_lang_VerifyError(), 4520 "class %s overrides final method %s.%s%s", 4521 this_klass->external_name(), 4522 super_m->method_holder()->external_name(), 4523 name->as_C_string(), 4524 signature->as_C_string() 4525 ); 4526 return; 4527 } 4528 4529 // continue to look from super_m's holder's super. 4530 k = super_m->method_holder()->super(); 4531 continue; 4532 } 4533 4534 k = k->super(); 4535 } 4536 } 4537 } 4538} 4539 4540 4541// assumes that this_klass is an interface 4542static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { 4543 assert(this_klass != NULL, "invariant"); 4544 assert(this_klass->is_interface(), "not an interface"); 4545 const Array<Method*>* methods = this_klass->methods(); 4546 const int num_methods = methods->length(); 4547 4548 for (int index = 0; index < num_methods; index++) { 4549 const Method* const m = methods->at(index); 4550 // if m is static and not the init method, throw a verify error 4551 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4552 ResourceMark rm(THREAD); 4553 Exceptions::fthrow( 4554 THREAD_AND_LOCATION, 4555 vmSymbols::java_lang_VerifyError(), 4556 "Illegal static method %s in interface %s", 4557 m->name()->as_C_string(), 4558 this_klass->external_name() 4559 ); 4560 return; 4561 } 4562 } 4563} 4564 4565// utility methods for format checking 4566 4567void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const { 4568 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 4569 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); 4570 if (is_module) { 4571 ResourceMark rm(THREAD); 4572 Exceptions::fthrow( 4573 THREAD_AND_LOCATION, 4574 vmSymbols::java_lang_NoClassDefFoundError(), 4575 "%s is not a class because access_flag ACC_MODULE is set", 4576 _class_name->as_C_string()); 4577 return; 4578 } 4579 4580 if (!_need_verify) { return; } 4581 4582 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4583 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4584 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4585 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4586 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4587 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4588 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4589 4590 if ((is_abstract && is_final) || 4591 (is_interface && !is_abstract) || 4592 (is_interface && major_gte_15 && (is_super || is_enum)) || 4593 (!is_interface && major_gte_15 && is_annotation)) { 4594 ResourceMark rm(THREAD); 4595 Exceptions::fthrow( 4596 THREAD_AND_LOCATION, 4597 vmSymbols::java_lang_ClassFormatError(), 4598 "Illegal class modifiers in class %s: 0x%X", 4599 _class_name->as_C_string(), flags 4600 ); 4601 return; 4602 } 4603} 4604 4605static bool has_illegal_visibility(jint flags) { 4606 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4607 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4608 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4609 4610 return ((is_public && is_protected) || 4611 (is_public && is_private) || 4612 (is_protected && is_private)); 4613} 4614 4615static bool is_supported_version(u2 major, u2 minor){ 4616 const u2 max_version = JAVA_MAX_SUPPORTED_VERSION; 4617 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 4618 (major <= max_version) && 4619 ((major != max_version) || 4620 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 4621} 4622 4623void ClassFileParser::verify_legal_field_modifiers(jint flags, 4624 bool is_interface, 4625 TRAPS) const { 4626 if (!_need_verify) { return; } 4627 4628 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4629 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4630 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4631 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4632 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4633 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4634 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4635 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4636 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4637 4638 bool is_illegal = false; 4639 4640 if (is_interface) { 4641 if (!is_public || !is_static || !is_final || is_private || 4642 is_protected || is_volatile || is_transient || 4643 (major_gte_15 && is_enum)) { 4644 is_illegal = true; 4645 } 4646 } else { // not interface 4647 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4648 is_illegal = true; 4649 } 4650 } 4651 4652 if (is_illegal) { 4653 ResourceMark rm(THREAD); 4654 Exceptions::fthrow( 4655 THREAD_AND_LOCATION, 4656 vmSymbols::java_lang_ClassFormatError(), 4657 "Illegal field modifiers in class %s: 0x%X", 4658 _class_name->as_C_string(), flags); 4659 return; 4660 } 4661} 4662 4663void ClassFileParser::verify_legal_method_modifiers(jint flags, 4664 bool is_interface, 4665 const Symbol* name, 4666 TRAPS) const { 4667 if (!_need_verify) { return; } 4668 4669 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4670 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4671 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4672 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4673 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4674 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4675 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4676 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4677 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4678 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4679 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4680 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4681 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4682 4683 bool is_illegal = false; 4684 4685 if (is_interface) { 4686 if (major_gte_8) { 4687 // Class file version is JAVA_8_VERSION or later Methods of 4688 // interfaces may set any of the flags except ACC_PROTECTED, 4689 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4690 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4691 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4692 (is_native || is_protected || is_final || is_synchronized) || 4693 // If a specific method of a class or interface has its 4694 // ACC_ABSTRACT flag set, it must not have any of its 4695 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4696 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4697 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4698 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4699 (is_abstract && (is_private || is_static || is_strict))) { 4700 is_illegal = true; 4701 } 4702 } else if (major_gte_15) { 4703 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4704 if (!is_public || is_private || is_protected || is_static || is_final || 4705 is_synchronized || is_native || !is_abstract || is_strict) { 4706 is_illegal = true; 4707 } 4708 } else { 4709 // Class file version is pre-JAVA_1_5_VERSION 4710 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4711 is_illegal = true; 4712 } 4713 } 4714 } else { // not interface 4715 if (has_illegal_visibility(flags)) { 4716 is_illegal = true; 4717 } else { 4718 if (is_initializer) { 4719 if (is_static || is_final || is_synchronized || is_native || 4720 is_abstract || (major_gte_15 && is_bridge)) { 4721 is_illegal = true; 4722 } 4723 } else { // not initializer 4724 if (is_abstract) { 4725 if ((is_final || is_native || is_private || is_static || 4726 (major_gte_15 && (is_synchronized || is_strict)))) { 4727 is_illegal = true; 4728 } 4729 } 4730 } 4731 } 4732 } 4733 4734 if (is_illegal) { 4735 ResourceMark rm(THREAD); 4736 Exceptions::fthrow( 4737 THREAD_AND_LOCATION, 4738 vmSymbols::java_lang_ClassFormatError(), 4739 "Method %s in class %s has illegal modifiers: 0x%X", 4740 name->as_C_string(), _class_name->as_C_string(), flags); 4741 return; 4742 } 4743} 4744 4745void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, 4746 int length, 4747 TRAPS) const { 4748 assert(_need_verify, "only called when _need_verify is true"); 4749 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) { 4750 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4751 } 4752} 4753 4754// Unqualified names may not contain the characters '.', ';', '[', or '/'. 4755// In class names, '/' separates unqualified names. This is verified in this function also. 4756// Method names also may not contain the characters '<' or '>', unless <init> 4757// or <clinit>. Note that method names may not be <init> or <clinit> in this 4758// method. Because these names have been checked as special cases before 4759// calling this method in verify_legal_method_name. 4760// 4761// This method is also called from the modular system APIs in modules.cpp 4762// to verify the validity of module and package names. 4763bool ClassFileParser::verify_unqualified_name(const char* name, 4764 unsigned int length, 4765 int type) { 4766 for (const char* p = name; p != name + length;) { 4767 jchar ch = *p; 4768 if (ch < 128) { 4769 if (ch == '.' || ch == ';' || ch == '[' ) { 4770 return false; // do not permit '.', ';', or '[' 4771 } 4772 if (ch == '/') { 4773 // check for '//' or leading or trailing '/' which are not legal 4774 // unqualified name must not be empty 4775 if (type == ClassFileParser::LegalClass) { 4776 if (p == name || p+1 >= name+length || *(p+1) == '/') { 4777 return false; 4778 } 4779 } else { 4780 return false; // do not permit '/' unless it's class name 4781 } 4782 } 4783 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) { 4784 return false; // do not permit '<' or '>' in method names 4785 } 4786 p++; 4787 } else { 4788 char* tmp_p = UTF8::next(p, &ch); 4789 p = tmp_p; 4790 } 4791 } 4792 return true; 4793} 4794 4795// Take pointer to a string. Skip over the longest part of the string that could 4796// be taken as a fieldname. Allow '/' if slash_ok is true. 4797// Return a pointer to just past the fieldname. 4798// Return NULL if no fieldname at all was found, or in the case of slash_ok 4799// being true, we saw consecutive slashes (meaning we were looking for a 4800// qualified path but found something that was badly-formed). 4801static const char* skip_over_field_name(const char* name, 4802 bool slash_ok, 4803 unsigned int length) { 4804 const char* p; 4805 jboolean last_is_slash = false; 4806 jboolean not_first_ch = false; 4807 4808 for (p = name; p != name + length; not_first_ch = true) { 4809 const char* old_p = p; 4810 jchar ch = *p; 4811 if (ch < 128) { 4812 p++; 4813 // quick check for ascii 4814 if ((ch >= 'a' && ch <= 'z') || 4815 (ch >= 'A' && ch <= 'Z') || 4816 (ch == '_' || ch == '$') || 4817 (not_first_ch && ch >= '0' && ch <= '9')) { 4818 last_is_slash = false; 4819 continue; 4820 } 4821 if (slash_ok && ch == '/') { 4822 if (last_is_slash) { 4823 return NULL; // Don't permit consecutive slashes 4824 } 4825 last_is_slash = true; 4826 continue; 4827 } 4828 } 4829 else { 4830 jint unicode_ch; 4831 char* tmp_p = UTF8::next_character(p, &unicode_ch); 4832 p = tmp_p; 4833 last_is_slash = false; 4834 // Check if ch is Java identifier start or is Java identifier part 4835 // 4672820: call java.lang.Character methods directly without generating separate tables. 4836 EXCEPTION_MARK; 4837 4838 // return value 4839 JavaValue result(T_BOOLEAN); 4840 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 4841 JavaCallArguments args; 4842 args.push_int(unicode_ch); 4843 4844 // public static boolean isJavaIdentifierStart(char ch); 4845 JavaCalls::call_static(&result, 4846 SystemDictionary::Character_klass(), 4847 vmSymbols::isJavaIdentifierStart_name(), 4848 vmSymbols::int_bool_signature(), 4849 &args, 4850 THREAD); 4851 4852 if (HAS_PENDING_EXCEPTION) { 4853 CLEAR_PENDING_EXCEPTION; 4854 return 0; 4855 } 4856 if (result.get_jboolean()) { 4857 continue; 4858 } 4859 4860 if (not_first_ch) { 4861 // public static boolean isJavaIdentifierPart(char ch); 4862 JavaCalls::call_static(&result, 4863 SystemDictionary::Character_klass(), 4864 vmSymbols::isJavaIdentifierPart_name(), 4865 vmSymbols::int_bool_signature(), 4866 &args, 4867 THREAD); 4868 4869 if (HAS_PENDING_EXCEPTION) { 4870 CLEAR_PENDING_EXCEPTION; 4871 return 0; 4872 } 4873 4874 if (result.get_jboolean()) { 4875 continue; 4876 } 4877 } 4878 } 4879 return (not_first_ch) ? old_p : NULL; 4880 } 4881 return (not_first_ch) ? p : NULL; 4882} 4883 4884// Take pointer to a string. Skip over the longest part of the string that could 4885// be taken as a field signature. Allow "void" if void_ok. 4886// Return a pointer to just past the signature. 4887// Return NULL if no legal signature is found. 4888const char* ClassFileParser::skip_over_field_signature(const char* signature, 4889 bool void_ok, 4890 unsigned int length, 4891 TRAPS) const { 4892 unsigned int array_dim = 0; 4893 while (length > 0) { 4894 switch (signature[0]) { 4895 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 4896 case JVM_SIGNATURE_BOOLEAN: 4897 case JVM_SIGNATURE_BYTE: 4898 case JVM_SIGNATURE_CHAR: 4899 case JVM_SIGNATURE_SHORT: 4900 case JVM_SIGNATURE_INT: 4901 case JVM_SIGNATURE_FLOAT: 4902 case JVM_SIGNATURE_LONG: 4903 case JVM_SIGNATURE_DOUBLE: 4904 return signature + 1; 4905 case JVM_SIGNATURE_CLASS: { 4906 if (_major_version < JAVA_1_5_VERSION) { 4907 // Skip over the class name if one is there 4908 const char* const p = skip_over_field_name(signature + 1, true, --length); 4909 4910 // The next character better be a semicolon 4911 if (p && (p - signature) > 1 && p[0] == ';') { 4912 return p + 1; 4913 } 4914 } 4915 else { 4916 // Skip leading 'L' and ignore first appearance of ';' 4917 length--; 4918 signature++; 4919 char* c = strchr((char*) signature, ';'); 4920 // Format check signature 4921 if (c != NULL) { 4922 ResourceMark rm(THREAD); 4923 int newlen = c - (char*) signature; 4924 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1); 4925 strncpy(sig, signature, newlen); 4926 sig[newlen] = '\0'; 4927 4928 bool legal = verify_unqualified_name(sig, newlen, LegalClass); 4929 if (!legal) { 4930 classfile_parse_error("Class name contains illegal character " 4931 "in descriptor in class file %s", 4932 CHECK_0); 4933 return NULL; 4934 } 4935 return signature + newlen + 1; 4936 } 4937 } 4938 return NULL; 4939 } 4940 case JVM_SIGNATURE_ARRAY: 4941 array_dim++; 4942 if (array_dim > 255) { 4943 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 4944 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 4945 } 4946 // The rest of what's there better be a legal signature 4947 signature++; 4948 length--; 4949 void_ok = false; 4950 break; 4951 default: 4952 return NULL; 4953 } 4954 } 4955 return NULL; 4956} 4957 4958// Checks if name is a legal class name. 4959void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { 4960 if (!_need_verify || _relax_verify) { return; } 4961 4962 char buf[fixed_buffer_size]; 4963 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4964 unsigned int length = name->utf8_length(); 4965 bool legal = false; 4966 4967 if (length > 0) { 4968 const char* p; 4969 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 4970 p = skip_over_field_signature(bytes, false, length, CHECK); 4971 legal = (p != NULL) && ((p - bytes) == (int)length); 4972 } else if (_major_version < JAVA_1_5_VERSION) { 4973 if (bytes[0] != '<') { 4974 p = skip_over_field_name(bytes, true, length); 4975 legal = (p != NULL) && ((p - bytes) == (int)length); 4976 } 4977 } else { 4978 // 4900761: relax the constraints based on JSR202 spec 4979 // Class names may be drawn from the entire Unicode character set. 4980 // Identifiers between '/' must be unqualified names. 4981 // The utf8 string has been verified when parsing cpool entries. 4982 legal = verify_unqualified_name(bytes, length, LegalClass); 4983 } 4984 } 4985 if (!legal) { 4986 ResourceMark rm(THREAD); 4987 assert(_class_name != NULL, "invariant"); 4988 Exceptions::fthrow( 4989 THREAD_AND_LOCATION, 4990 vmSymbols::java_lang_ClassFormatError(), 4991 "Illegal class name \"%s\" in class file %s", bytes, 4992 _class_name->as_C_string() 4993 ); 4994 return; 4995 } 4996} 4997 4998// Checks if name is a legal field name. 4999void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { 5000 if (!_need_verify || _relax_verify) { return; } 5001 5002 char buf[fixed_buffer_size]; 5003 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5004 unsigned int length = name->utf8_length(); 5005 bool legal = false; 5006 5007 if (length > 0) { 5008 if (_major_version < JAVA_1_5_VERSION) { 5009 if (bytes[0] != '<') { 5010 const char* p = skip_over_field_name(bytes, false, length); 5011 legal = (p != NULL) && ((p - bytes) == (int)length); 5012 } 5013 } else { 5014 // 4881221: relax the constraints based on JSR202 spec 5015 legal = verify_unqualified_name(bytes, length, LegalField); 5016 } 5017 } 5018 5019 if (!legal) { 5020 ResourceMark rm(THREAD); 5021 assert(_class_name != NULL, "invariant"); 5022 Exceptions::fthrow( 5023 THREAD_AND_LOCATION, 5024 vmSymbols::java_lang_ClassFormatError(), 5025 "Illegal field name \"%s\" in class %s", bytes, 5026 _class_name->as_C_string() 5027 ); 5028 return; 5029 } 5030} 5031 5032// Checks if name is a legal method name. 5033void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { 5034 if (!_need_verify || _relax_verify) { return; } 5035 5036 assert(name != NULL, "method name is null"); 5037 char buf[fixed_buffer_size]; 5038 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5039 unsigned int length = name->utf8_length(); 5040 bool legal = false; 5041 5042 if (length > 0) { 5043 if (bytes[0] == '<') { 5044 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5045 legal = true; 5046 } 5047 } else if (_major_version < JAVA_1_5_VERSION) { 5048 const char* p; 5049 p = skip_over_field_name(bytes, false, length); 5050 legal = (p != NULL) && ((p - bytes) == (int)length); 5051 } else { 5052 // 4881221: relax the constraints based on JSR202 spec 5053 legal = verify_unqualified_name(bytes, length, LegalMethod); 5054 } 5055 } 5056 5057 if (!legal) { 5058 ResourceMark rm(THREAD); 5059 assert(_class_name != NULL, "invariant"); 5060 Exceptions::fthrow( 5061 THREAD_AND_LOCATION, 5062 vmSymbols::java_lang_ClassFormatError(), 5063 "Illegal method name \"%s\" in class %s", bytes, 5064 _class_name->as_C_string() 5065 ); 5066 return; 5067 } 5068} 5069 5070 5071// Checks if signature is a legal field signature. 5072void ClassFileParser::verify_legal_field_signature(const Symbol* name, 5073 const Symbol* signature, 5074 TRAPS) const { 5075 if (!_need_verify) { return; } 5076 5077 char buf[fixed_buffer_size]; 5078 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5079 const unsigned int length = signature->utf8_length(); 5080 const char* const p = skip_over_field_signature(bytes, false, length, CHECK); 5081 5082 if (p == NULL || (p - bytes) != (int)length) { 5083 throwIllegalSignature("Field", name, signature, CHECK); 5084 } 5085} 5086 5087// Checks if signature is a legal method signature. 5088// Returns number of parameters 5089int ClassFileParser::verify_legal_method_signature(const Symbol* name, 5090 const Symbol* signature, 5091 TRAPS) const { 5092 if (!_need_verify) { 5093 // make sure caller's args_size will be less than 0 even for non-static 5094 // method so it will be recomputed in compute_size_of_parameters(). 5095 return -2; 5096 } 5097 5098 // Class initializers cannot have args for class format version >= 51. 5099 if (name == vmSymbols::class_initializer_name() && 5100 signature != vmSymbols::void_method_signature() && 5101 _major_version >= JAVA_7_VERSION) { 5102 throwIllegalSignature("Method", name, signature, CHECK_0); 5103 return 0; 5104 } 5105 5106 unsigned int args_size = 0; 5107 char buf[fixed_buffer_size]; 5108 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5109 unsigned int length = signature->utf8_length(); 5110 const char* nextp; 5111 5112 // The first character must be a '(' 5113 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5114 length--; 5115 // Skip over legal field signatures 5116 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5117 while ((length > 0) && (nextp != NULL)) { 5118 args_size++; 5119 if (p[0] == 'J' || p[0] == 'D') { 5120 args_size++; 5121 } 5122 length -= nextp - p; 5123 p = nextp; 5124 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5125 } 5126 // The first non-signature thing better be a ')' 5127 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5128 length--; 5129 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 5130 // All internal methods must return void 5131 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5132 return args_size; 5133 } 5134 } else { 5135 // Now we better just have a return value 5136 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5137 if (nextp && ((int)length == (nextp - p))) { 5138 return args_size; 5139 } 5140 } 5141 } 5142 } 5143 // Report error 5144 throwIllegalSignature("Method", name, signature, CHECK_0); 5145 return 0; 5146} 5147 5148int ClassFileParser::static_field_size() const { 5149 assert(_field_info != NULL, "invariant"); 5150 return _field_info->static_field_size; 5151} 5152 5153int ClassFileParser::total_oop_map_count() const { 5154 assert(_field_info != NULL, "invariant"); 5155 return _field_info->total_oop_map_count; 5156} 5157 5158jint ClassFileParser::layout_size() const { 5159 assert(_field_info != NULL, "invariant"); 5160 return _field_info->instance_size; 5161} 5162 5163static void check_methods_for_intrinsics(const InstanceKlass* ik, 5164 const Array<Method*>* methods) { 5165 assert(ik != NULL, "invariant"); 5166 assert(methods != NULL, "invariant"); 5167 5168 // Set up Method*::intrinsic_id as soon as we know the names of methods. 5169 // (We used to do this lazily, but now we query it in Rewriter, 5170 // which is eagerly done for every method, so we might as well do it now, 5171 // when everything is fresh in memory.) 5172 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik); 5173 5174 if (klass_id != vmSymbols::NO_SID) { 5175 for (int j = 0; j < methods->length(); ++j) { 5176 Method* method = methods->at(j); 5177 method->init_intrinsic_id(); 5178 5179 if (CheckIntrinsics) { 5180 // Check if an intrinsic is defined for method 'method', 5181 // but the method is not annotated with @HotSpotIntrinsicCandidate. 5182 if (method->intrinsic_id() != vmIntrinsics::_none && 5183 !method->intrinsic_candidate()) { 5184 tty->print("Compiler intrinsic is defined for method [%s], " 5185 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s", 5186 method->name_and_sig_as_C_string(), 5187 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 5188 ); 5189 tty->cr(); 5190 DEBUG_ONLY(vm_exit(1)); 5191 } 5192 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate, 5193 // but there is no intrinsic available for it. 5194 if (method->intrinsic_candidate() && 5195 method->intrinsic_id() == vmIntrinsics::_none) { 5196 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, " 5197 "but no compiler intrinsic is defined for the method.%s", 5198 method->name_and_sig_as_C_string(), 5199 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5200 ); 5201 tty->cr(); 5202 DEBUG_ONLY(vm_exit(1)); 5203 } 5204 } 5205 } // end for 5206 5207#ifdef ASSERT 5208 if (CheckIntrinsics) { 5209 // Check for orphan methods in the current class. A method m 5210 // of a class C is orphan if an intrinsic is defined for method m, 5211 // but class C does not declare m. 5212 // The check is potentially expensive, therefore it is available 5213 // only in debug builds. 5214 5215 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) { 5216 if (vmIntrinsics::_compiledLambdaForm == id) { 5217 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 5218 // generated for the JVM from a LambdaForm and therefore no method 5219 // is defined for it. 5220 continue; 5221 } 5222 5223 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) { 5224 // Check if the current class contains a method with the same 5225 // name, flags, signature. 5226 bool match = false; 5227 for (int j = 0; j < methods->length(); ++j) { 5228 const Method* method = methods->at(j); 5229 if (method->intrinsic_id() == id) { 5230 match = true; 5231 break; 5232 } 5233 } 5234 5235 if (!match) { 5236 char buf[1000]; 5237 tty->print("Compiler intrinsic is defined for method [%s], " 5238 "but the method is not available in class [%s].%s", 5239 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), 5240 buf, sizeof(buf)), 5241 ik->name()->as_C_string(), 5242 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5243 ); 5244 tty->cr(); 5245 DEBUG_ONLY(vm_exit(1)); 5246 } 5247 } 5248 } // end for 5249 } // CheckIntrinsics 5250#endif // ASSERT 5251 } 5252} 5253 5254InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) { 5255 if (_klass != NULL) { 5256 return _klass; 5257 } 5258 5259 InstanceKlass* const ik = 5260 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); 5261 5262 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL); 5263 5264 assert(_klass == ik, "invariant"); 5265 5266 ik->set_has_passed_fingerprint_check(false); 5267 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) { 5268 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik); 5269 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) { 5270 // This class matches with a class saved in an AOT library 5271 ik->set_has_passed_fingerprint_check(true); 5272 } else { 5273 ResourceMark rm; 5274 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT, 5275 ik->external_name(), aot_fp, _stream->compute_fingerprint()); 5276 } 5277 } 5278 5279 return ik; 5280} 5281 5282void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) { 5283 assert(ik != NULL, "invariant"); 5284 5285 set_klass_to_deallocate(ik); 5286 5287 assert(_field_info != NULL, "invariant"); 5288 assert(ik->static_field_size() == _field_info->static_field_size, "sanity"); 5289 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count, 5290 "sanity"); 5291 5292 assert(ik->is_instance_klass(), "sanity"); 5293 assert(ik->size_helper() == _field_info->instance_size, "sanity"); 5294 5295 // Fill in information already parsed 5296 ik->set_should_verify_class(_need_verify); 5297 5298 // Not yet: supers are done below to support the new subtype-checking fields 5299 ik->set_class_loader_data(_loader_data); 5300 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size); 5301 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields); 5302 assert(_fac != NULL, "invariant"); 5303 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]); 5304 5305 // this transfers ownership of a lot of arrays from 5306 // the parser onto the InstanceKlass* 5307 apply_parsed_class_metadata(ik, _java_fields_count, CHECK); 5308 5309 // note that is not safe to use the fields in the parser from this point on 5310 assert(NULL == _cp, "invariant"); 5311 assert(NULL == _fields, "invariant"); 5312 assert(NULL == _methods, "invariant"); 5313 assert(NULL == _inner_classes, "invariant"); 5314 assert(NULL == _local_interfaces, "invariant"); 5315 assert(NULL == _transitive_interfaces, "invariant"); 5316 assert(NULL == _combined_annotations, "invariant"); 5317 5318 if (_has_final_method) { 5319 ik->set_has_final_method(); 5320 } 5321 5322 ik->copy_method_ordering(_method_ordering, CHECK); 5323 // The InstanceKlass::_methods_jmethod_ids cache 5324 // is managed on the assumption that the initial cache 5325 // size is equal to the number of methods in the class. If 5326 // that changes, then InstanceKlass::idnum_can_increment() 5327 // has to be changed accordingly. 5328 ik->set_initial_method_idnum(ik->methods()->length()); 5329 5330 ik->set_name(_class_name); 5331 5332 if (is_anonymous()) { 5333 // I am well known to myself 5334 ik->constants()->klass_at_put(_this_class_index, ik); // eagerly resolve 5335 } 5336 5337 ik->set_minor_version(_minor_version); 5338 ik->set_major_version(_major_version); 5339 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); 5340 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); 5341 5342 if (_host_klass != NULL) { 5343 assert (ik->is_anonymous(), "should be the same"); 5344 ik->set_host_klass(_host_klass); 5345 } 5346 5347 // Set PackageEntry for this_klass 5348 oop cl = ik->class_loader(); 5349 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl)); 5350 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); 5351 ik->set_package(cld, CHECK); 5352 5353 const Array<Method*>* const methods = ik->methods(); 5354 assert(methods != NULL, "invariant"); 5355 const int methods_len = methods->length(); 5356 5357 check_methods_for_intrinsics(ik, methods); 5358 5359 // Fill in field values obtained by parse_classfile_attributes 5360 if (_parsed_annotations->has_any_annotations()) { 5361 _parsed_annotations->apply_to(ik); 5362 } 5363 5364 apply_parsed_class_attributes(ik); 5365 5366 // Miranda methods 5367 if ((_num_miranda_methods > 0) || 5368 // if this class introduced new miranda methods or 5369 (_super_klass != NULL && _super_klass->has_miranda_methods()) 5370 // super class exists and this class inherited miranda methods 5371 ) { 5372 ik->set_has_miranda_methods(); // then set a flag 5373 } 5374 5375 // Fill in information needed to compute superclasses. 5376 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), CHECK); 5377 5378 // Initialize itable offset tables 5379 klassItable::setup_itable_offset_table(ik); 5380 5381 // Compute transitive closure of interfaces this class implements 5382 // Do final class setup 5383 fill_oop_maps(ik, 5384 _field_info->nonstatic_oop_map_count, 5385 _field_info->nonstatic_oop_offsets, 5386 _field_info->nonstatic_oop_counts); 5387 5388 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 5389 set_precomputed_flags(ik); 5390 5391 // check if this class can access its super class 5392 check_super_class_access(ik, CHECK); 5393 5394 // check if this class can access its superinterfaces 5395 check_super_interface_access(ik, CHECK); 5396 5397 // check if this class overrides any final method 5398 check_final_method_override(ik, CHECK); 5399 5400 // reject static interface methods prior to Java 8 5401 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { 5402 check_illegal_static_method(ik, CHECK); 5403 } 5404 5405 // Obtain this_klass' module entry 5406 ModuleEntry* module_entry = ik->module(); 5407 assert(module_entry != NULL, "module_entry should always be set"); 5408 5409 // Obtain java.lang.Module 5410 Handle module_handle(THREAD, JNIHandles::resolve(module_entry->module())); 5411 5412 // Allocate mirror and initialize static fields 5413 // The create_mirror() call will also call compute_modifiers() 5414 java_lang_Class::create_mirror(ik, 5415 _loader_data->class_loader(), 5416 module_handle, 5417 _protection_domain, 5418 CHECK); 5419 5420 assert(_all_mirandas != NULL, "invariant"); 5421 5422 // Generate any default methods - default methods are public interface methods 5423 // that have a default implementation. This is new with Java 8. 5424 if (_has_nonstatic_concrete_methods) { 5425 DefaultMethods::generate_default_methods(ik, 5426 _all_mirandas, 5427 CHECK); 5428 } 5429 5430 // Add read edges to the unnamed modules of the bootstrap and app class loaders. 5431 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && 5432 !module_entry->has_default_read_edges()) { 5433 if (!module_entry->set_has_default_read_edges()) { 5434 // We won a potential race 5435 JvmtiExport::add_default_read_edges(module_handle, THREAD); 5436 } 5437 } 5438 5439 // Update the loader_data graph. 5440 record_defined_class_dependencies(ik, CHECK); 5441 5442 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); 5443 5444 if (!is_internal()) { 5445 if (log_is_enabled(Info, class, load)) { 5446 ResourceMark rm; 5447 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string(); 5448 5449 if (log_is_enabled(Info, class, load)) { 5450 ik->print_loading_log(LogLevel::Info, _loader_data, module_name, _stream); 5451 } 5452 // No 'else' here as logging levels are not mutually exclusive 5453 if (log_is_enabled(Debug, class, load)) { 5454 ik->print_loading_log(LogLevel::Debug, _loader_data, module_name, _stream); 5455 } 5456 } 5457 5458 if (log_is_enabled(Debug, class, resolve)) { 5459 ResourceMark rm; 5460 // print out the superclass. 5461 const char * from = ik->external_name(); 5462 if (ik->java_super() != NULL) { 5463 log_debug(class, resolve)("%s %s (super)", 5464 from, 5465 ik->java_super()->external_name()); 5466 } 5467 // print out each of the interface classes referred to by this class. 5468 const Array<Klass*>* const local_interfaces = ik->local_interfaces(); 5469 if (local_interfaces != NULL) { 5470 const int length = local_interfaces->length(); 5471 for (int i = 0; i < length; i++) { 5472 const Klass* const k = local_interfaces->at(i); 5473 const char * to = k->external_name(); 5474 log_debug(class, resolve)("%s %s (interface)", from, to); 5475 } 5476 } 5477 } 5478 } 5479 5480 TRACE_INIT_ID(ik); 5481 5482 // If we reach here, all is well. 5483 // Now remove the InstanceKlass* from the _klass_to_deallocate field 5484 // in order for it to not be destroyed in the ClassFileParser destructor. 5485 set_klass_to_deallocate(NULL); 5486 5487 // it's official 5488 set_klass(ik); 5489 5490 debug_only(ik->verify();) 5491} 5492 5493// For an anonymous class that is in the unnamed package, move it to its host class's 5494// package by prepending its host class's package name to its class name and setting 5495// its _class_name field. 5496void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) { 5497 ResourceMark rm(THREAD); 5498 assert(strrchr(_class_name->as_C_string(), '/') == NULL, 5499 "Anonymous class should not be in a package"); 5500 const char* host_pkg_name = 5501 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL); 5502 5503 if (host_pkg_name != NULL) { 5504 size_t host_pkg_len = strlen(host_pkg_name); 5505 int class_name_len = _class_name->utf8_length(); 5506 char* new_anon_name = 5507 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len); 5508 // Copy host package name and trailing /. 5509 strncpy(new_anon_name, host_pkg_name, host_pkg_len); 5510 new_anon_name[host_pkg_len] = '/'; 5511 // Append anonymous class name. The anonymous class name can contain odd 5512 // characters. So, do a strncpy instead of using sprintf("%s..."). 5513 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len); 5514 5515 // Create a symbol and update the anonymous class name. 5516 _class_name = SymbolTable::new_symbol(new_anon_name, 5517 (int)host_pkg_len + 1 + class_name_len, 5518 CHECK); 5519 } 5520} 5521 5522// If the host class and the anonymous class are in the same package then do 5523// nothing. If the anonymous class is in the unnamed package then move it to its 5524// host's package. If the classes are in different packages then throw an IAE 5525// exception. 5526void ClassFileParser::fix_anonymous_class_name(TRAPS) { 5527 assert(_host_klass != NULL, "Expected an anonymous class"); 5528 5529 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(), 5530 _class_name->utf8_length(), '/'); 5531 if (anon_last_slash == NULL) { // Unnamed package 5532 prepend_host_package_name(_host_klass, CHECK); 5533 } else { 5534 if (!InstanceKlass::is_same_class_package(_host_klass->class_loader(), 5535 _host_klass->name(), 5536 _host_klass->class_loader(), 5537 _class_name)) { 5538 ResourceMark rm(THREAD); 5539 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 5540 err_msg("Host class %s and anonymous class %s are in different packages", 5541 _host_klass->name()->as_C_string(), _class_name->as_C_string())); 5542 } 5543 } 5544} 5545 5546static bool relax_format_check_for(ClassLoaderData* loader_data) { 5547 bool trusted = (loader_data->is_the_null_class_loader_data() || 5548 SystemDictionary::is_platform_class_loader(loader_data->class_loader())); 5549 bool need_verify = 5550 // verifyAll 5551 (BytecodeVerificationLocal && BytecodeVerificationRemote) || 5552 // verifyRemote 5553 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted); 5554 return !need_verify; 5555} 5556 5557ClassFileParser::ClassFileParser(ClassFileStream* stream, 5558 Symbol* name, 5559 ClassLoaderData* loader_data, 5560 Handle protection_domain, 5561 const InstanceKlass* host_klass, 5562 GrowableArray<Handle>* cp_patches, 5563 Publicity pub_level, 5564 TRAPS) : 5565 _stream(stream), 5566 _requested_name(name), 5567 _loader_data(loader_data), 5568 _host_klass(host_klass), 5569 _cp_patches(cp_patches), 5570 _super_klass(), 5571 _cp(NULL), 5572 _fields(NULL), 5573 _methods(NULL), 5574 _inner_classes(NULL), 5575 _local_interfaces(NULL), 5576 _transitive_interfaces(NULL), 5577 _combined_annotations(NULL), 5578 _annotations(NULL), 5579 _type_annotations(NULL), 5580 _fields_annotations(NULL), 5581 _fields_type_annotations(NULL), 5582 _klass(NULL), 5583 _klass_to_deallocate(NULL), 5584 _parsed_annotations(NULL), 5585 _fac(NULL), 5586 _field_info(NULL), 5587 _method_ordering(NULL), 5588 _all_mirandas(NULL), 5589 _vtable_size(0), 5590 _itable_size(0), 5591 _num_miranda_methods(0), 5592 _rt(REF_NONE), 5593 _protection_domain(protection_domain), 5594 _access_flags(), 5595 _pub_level(pub_level), 5596 _bad_constant_seen(0), 5597 _synthetic_flag(false), 5598 _sde_length(false), 5599 _sde_buffer(NULL), 5600 _sourcefile_index(0), 5601 _generic_signature_index(0), 5602 _major_version(0), 5603 _minor_version(0), 5604 _this_class_index(0), 5605 _super_class_index(0), 5606 _itfs_len(0), 5607 _java_fields_count(0), 5608 _need_verify(false), 5609 _relax_verify(false), 5610 _has_nonstatic_concrete_methods(false), 5611 _declares_nonstatic_concrete_methods(false), 5612 _has_final_method(false), 5613 _has_finalizer(false), 5614 _has_empty_finalizer(false), 5615 _has_vanilla_constructor(false), 5616 _max_bootstrap_specifier_index(-1) { 5617 5618 _class_name = name != NULL ? name : vmSymbols::unknown_class_name(); 5619 5620 assert(THREAD->is_Java_thread(), "invariant"); 5621 assert(_loader_data != NULL, "invariant"); 5622 assert(stream != NULL, "invariant"); 5623 assert(_stream != NULL, "invariant"); 5624 assert(_stream->buffer() == _stream->current(), "invariant"); 5625 assert(_class_name != NULL, "invariant"); 5626 assert(0 == _access_flags.as_int(), "invariant"); 5627 5628 // Figure out whether we can skip format checking (matching classic VM behavior) 5629 if (DumpSharedSpaces) { 5630 // verify == true means it's a 'remote' class (i.e., non-boot class) 5631 // Verification decision is based on BytecodeVerificationRemote flag 5632 // for those classes. 5633 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote : 5634 BytecodeVerificationLocal; 5635 } 5636 else { 5637 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(), 5638 stream->need_verify()); 5639 } 5640 5641 // synch back verification state to stream 5642 stream->set_verify(_need_verify); 5643 5644 // Check if verification needs to be relaxed for this class file 5645 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 5646 _relax_verify = relax_format_check_for(_loader_data); 5647 5648 parse_stream(stream, CHECK); 5649 5650 post_process_parsed_stream(stream, _cp, CHECK); 5651} 5652 5653void ClassFileParser::clear_class_metadata() { 5654 // metadata created before the instance klass is created. Must be 5655 // deallocated if classfile parsing returns an error. 5656 _cp = NULL; 5657 _fields = NULL; 5658 _methods = NULL; 5659 _inner_classes = NULL; 5660 _local_interfaces = NULL; 5661 _transitive_interfaces = NULL; 5662 _combined_annotations = NULL; 5663 _annotations = _type_annotations = NULL; 5664 _fields_annotations = _fields_type_annotations = NULL; 5665} 5666 5667// Destructor to clean up 5668ClassFileParser::~ClassFileParser() { 5669 if (_cp != NULL) { 5670 MetadataFactory::free_metadata(_loader_data, _cp); 5671 } 5672 if (_fields != NULL) { 5673 MetadataFactory::free_array<u2>(_loader_data, _fields); 5674 } 5675 5676 if (_methods != NULL) { 5677 // Free methods 5678 InstanceKlass::deallocate_methods(_loader_data, _methods); 5679 } 5680 5681 // beware of the Universe::empty_blah_array!! 5682 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) { 5683 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 5684 } 5685 5686 // Free interfaces 5687 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, 5688 _local_interfaces, _transitive_interfaces); 5689 5690 if (_combined_annotations != NULL) { 5691 // After all annotations arrays have been created, they are installed into the 5692 // Annotations object that will be assigned to the InstanceKlass being created. 5693 5694 // Deallocate the Annotations object and the installed annotations arrays. 5695 _combined_annotations->deallocate_contents(_loader_data); 5696 5697 // If the _combined_annotations pointer is non-NULL, 5698 // then the other annotations fields should have been cleared. 5699 assert(_annotations == NULL, "Should have been cleared"); 5700 assert(_type_annotations == NULL, "Should have been cleared"); 5701 assert(_fields_annotations == NULL, "Should have been cleared"); 5702 assert(_fields_type_annotations == NULL, "Should have been cleared"); 5703 } else { 5704 // If the annotations arrays were not installed into the Annotations object, 5705 // then they have to be deallocated explicitly. 5706 MetadataFactory::free_array<u1>(_loader_data, _annotations); 5707 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 5708 Annotations::free_contents(_loader_data, _fields_annotations); 5709 Annotations::free_contents(_loader_data, _fields_type_annotations); 5710 } 5711 5712 clear_class_metadata(); 5713 5714 // deallocate the klass if already created. Don't directly deallocate, but add 5715 // to the deallocate list so that the klass is removed from the CLD::_klasses list 5716 // at a safepoint. 5717 if (_klass_to_deallocate != NULL) { 5718 _loader_data->add_to_deallocate_list(_klass_to_deallocate); 5719 } 5720} 5721 5722void ClassFileParser::parse_stream(const ClassFileStream* const stream, 5723 TRAPS) { 5724 5725 assert(stream != NULL, "invariant"); 5726 assert(_class_name != NULL, "invariant"); 5727 5728 // BEGIN STREAM PARSING 5729 stream->guarantee_more(8, CHECK); // magic, major, minor 5730 // Magic value 5731 const u4 magic = stream->get_u4_fast(); 5732 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 5733 "Incompatible magic value %u in class file %s", 5734 magic, CHECK); 5735 5736 // Version numbers 5737 _minor_version = stream->get_u2_fast(); 5738 _major_version = stream->get_u2_fast(); 5739 5740 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) { 5741 ResourceMark rm; 5742 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", 5743 _major_version, _minor_version, _class_name->as_C_string()); 5744 Exceptions::fthrow( 5745 THREAD_AND_LOCATION, 5746 vmSymbols::java_lang_UnsupportedClassVersionError(), 5747 "Unsupported major.minor version for dump time %u.%u", 5748 _major_version, 5749 _minor_version); 5750 } 5751 5752 // Check version numbers - we check this even with verifier off 5753 if (!is_supported_version(_major_version, _minor_version)) { 5754 ResourceMark rm(THREAD); 5755 Exceptions::fthrow( 5756 THREAD_AND_LOCATION, 5757 vmSymbols::java_lang_UnsupportedClassVersionError(), 5758 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 5759 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 5760 _class_name->as_C_string(), 5761 _major_version, 5762 _minor_version, 5763 JAVA_MAX_SUPPORTED_VERSION, 5764 JAVA_MAX_SUPPORTED_MINOR_VERSION); 5765 return; 5766 } 5767 5768 stream->guarantee_more(3, CHECK); // length, first cp tag 5769 const u2 cp_size = stream->get_u2_fast(); 5770 5771 guarantee_property( 5772 cp_size >= 1, "Illegal constant pool size %u in class file %s", 5773 cp_size, CHECK); 5774 5775 _cp = ConstantPool::allocate(_loader_data, 5776 cp_size, 5777 CHECK); 5778 5779 ConstantPool* const cp = _cp; 5780 5781 parse_constant_pool(stream, cp, cp_size, CHECK); 5782 5783 assert(cp_size == (const u2)cp->length(), "invariant"); 5784 5785 // ACCESS FLAGS 5786 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 5787 5788 // Access flags 5789 jint flags; 5790 // JVM_ACC_MODULE is defined in JDK-9 and later. 5791 if (_major_version >= JAVA_9_VERSION) { 5792 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE); 5793 } else { 5794 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 5795 } 5796 5797 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 5798 // Set abstract bit for old class files for backward compatibility 5799 flags |= JVM_ACC_ABSTRACT; 5800 } 5801 5802 verify_legal_class_modifiers(flags, CHECK); 5803 5804 short bad_constant = class_bad_constant_seen(); 5805 if (bad_constant != 0) { 5806 // Do not throw CFE until after the access_flags are checked because if 5807 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. 5808 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK); 5809 } 5810 5811 _access_flags.set_flags(flags); 5812 5813 // This class and superclass 5814 _this_class_index = stream->get_u2_fast(); 5815 check_property( 5816 valid_cp_range(_this_class_index, cp_size) && 5817 cp->tag_at(_this_class_index).is_unresolved_klass(), 5818 "Invalid this class index %u in constant pool in class file %s", 5819 _this_class_index, CHECK); 5820 5821 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); 5822 assert(class_name_in_cp != NULL, "class_name can't be null"); 5823 5824 // Update _class_name which could be null previously 5825 // to reflect the name in the constant pool 5826 _class_name = class_name_in_cp; 5827 5828 // Don't need to check whether this class name is legal or not. 5829 // It has been checked when constant pool is parsed. 5830 // However, make sure it is not an array type. 5831 if (_need_verify) { 5832 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 5833 "Bad class name in class file %s", 5834 CHECK); 5835 } 5836 5837 // Checks if name in class file matches requested name 5838 if (_requested_name != NULL && _requested_name != _class_name) { 5839 ResourceMark rm(THREAD); 5840 Exceptions::fthrow( 5841 THREAD_AND_LOCATION, 5842 vmSymbols::java_lang_NoClassDefFoundError(), 5843 "%s (wrong name: %s)", 5844 _class_name->as_C_string(), 5845 _requested_name != NULL ? _requested_name->as_C_string() : "NoName" 5846 ); 5847 return; 5848 } 5849 5850 // if this is an anonymous class fix up its name if it's in the unnamed 5851 // package. Otherwise, throw IAE if it is in a different package than 5852 // its host class. 5853 if (_host_klass != NULL) { 5854 fix_anonymous_class_name(CHECK); 5855 } 5856 5857 // Verification prevents us from creating names with dots in them, this 5858 // asserts that that's the case. 5859 assert(is_internal_format(_class_name), "external class name format used internally"); 5860 5861 if (!is_internal()) { 5862 if (log_is_enabled(Debug, class, preorder)){ 5863 ResourceMark rm(THREAD); 5864 outputStream* log = Log(class, preorder)::debug_stream(); 5865 log->print("%s", _class_name->as_klass_external_name()); 5866 if (stream->source() != NULL) { 5867 log->print(" source: %s", stream->source()); 5868 } 5869 log->cr(); 5870 } 5871 5872#if INCLUDE_CDS 5873 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) { 5874 // Only dump the classes that can be stored into CDS archive. 5875 // Anonymous classes such as generated LambdaForm classes are also not included. 5876 if (SystemDictionaryShared::is_sharing_possible(_loader_data) && 5877 _host_klass == NULL) { 5878 oop class_loader = _loader_data->class_loader(); 5879 ResourceMark rm(THREAD); 5880 // For the boot and platform class loaders, check if the class is not found in the 5881 // java runtime image. Additional check for the boot class loader is if the class 5882 // is not found in the boot loader's appended entries. This indicates that the class 5883 // is not useable during run time, such as the ones found in the --patch-module entries, 5884 // so it should not be included in the classlist file. 5885 if (((class_loader == NULL && !ClassLoader::contains_append_entry(stream->source())) || 5886 SystemDictionary::is_platform_class_loader(class_loader)) && 5887 !ClassLoader::is_jrt(stream->source())) { 5888 tty->print_cr("skip writing class %s from source %s to classlist file", 5889 _class_name->as_C_string(), stream->source()); 5890 } else { 5891 classlist_file->print_cr("%s", _class_name->as_C_string()); 5892 classlist_file->flush(); 5893 } 5894 } 5895 } 5896#endif 5897 } 5898 5899 // SUPERKLASS 5900 _super_class_index = stream->get_u2_fast(); 5901 _super_klass = parse_super_class(cp, 5902 _super_class_index, 5903 _need_verify, 5904 CHECK); 5905 5906 // Interfaces 5907 _itfs_len = stream->get_u2_fast(); 5908 parse_interfaces(stream, 5909 _itfs_len, 5910 cp, 5911 &_has_nonstatic_concrete_methods, 5912 CHECK); 5913 5914 assert(_local_interfaces != NULL, "invariant"); 5915 5916 // Fields (offsets are filled in later) 5917 _fac = new FieldAllocationCount(); 5918 parse_fields(stream, 5919 _access_flags.is_interface(), 5920 _fac, 5921 cp, 5922 cp_size, 5923 &_java_fields_count, 5924 CHECK); 5925 5926 assert(_fields != NULL, "invariant"); 5927 5928 // Methods 5929 AccessFlags promoted_flags; 5930 parse_methods(stream, 5931 _access_flags.is_interface(), 5932 &promoted_flags, 5933 &_has_final_method, 5934 &_declares_nonstatic_concrete_methods, 5935 CHECK); 5936 5937 assert(_methods != NULL, "invariant"); 5938 5939 // promote flags from parse_methods() to the klass' flags 5940 _access_flags.add_promoted_flags(promoted_flags.as_int()); 5941 5942 if (_declares_nonstatic_concrete_methods) { 5943 _has_nonstatic_concrete_methods = true; 5944 } 5945 5946 // Additional attributes/annotations 5947 _parsed_annotations = new ClassAnnotationCollector(); 5948 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); 5949 5950 assert(_inner_classes != NULL, "invariant"); 5951 5952 // Finalize the Annotations metadata object, 5953 // now that all annotation arrays have been created. 5954 create_combined_annotations(CHECK); 5955 5956 // Make sure this is the end of class file stream 5957 guarantee_property(stream->at_eos(), 5958 "Extra bytes at the end of class file %s", 5959 CHECK); 5960 5961 // all bytes in stream read and parsed 5962} 5963 5964void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, 5965 ConstantPool* cp, 5966 TRAPS) { 5967 assert(stream != NULL, "invariant"); 5968 assert(stream->at_eos(), "invariant"); 5969 assert(cp != NULL, "invariant"); 5970 assert(_loader_data != NULL, "invariant"); 5971 5972 if (_class_name == vmSymbols::java_lang_Object()) { 5973 check_property(_local_interfaces == Universe::the_empty_klass_array(), 5974 "java.lang.Object cannot implement an interface in class file %s", 5975 CHECK); 5976 } 5977 // We check super class after class file is parsed and format is checked 5978 if (_super_class_index > 0 && NULL ==_super_klass) { 5979 Symbol* const super_class_name = cp->klass_name_at(_super_class_index); 5980 if (_access_flags.is_interface()) { 5981 // Before attempting to resolve the superclass, check for class format 5982 // errors not checked yet. 5983 guarantee_property(super_class_name == vmSymbols::java_lang_Object(), 5984 "Interfaces must have java.lang.Object as superclass in class file %s", 5985 CHECK); 5986 } 5987 _super_klass = (const InstanceKlass*) 5988 SystemDictionary::resolve_super_or_fail(_class_name, 5989 super_class_name, 5990 _loader_data->class_loader(), 5991 _protection_domain, 5992 true, 5993 CHECK); 5994 } 5995 5996 if (_super_klass != NULL) { 5997 if (_super_klass->has_nonstatic_concrete_methods()) { 5998 _has_nonstatic_concrete_methods = true; 5999 } 6000 6001 if (_super_klass->is_interface()) { 6002 ResourceMark rm(THREAD); 6003 Exceptions::fthrow( 6004 THREAD_AND_LOCATION, 6005 vmSymbols::java_lang_IncompatibleClassChangeError(), 6006 "class %s has interface %s as super class", 6007 _class_name->as_klass_external_name(), 6008 _super_klass->external_name() 6009 ); 6010 return; 6011 } 6012 // Make sure super class is not final 6013 if (_super_klass->is_final()) { 6014 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class"); 6015 } 6016 } 6017 6018 // Compute the transitive list of all unique interfaces implemented by this class 6019 _transitive_interfaces = 6020 compute_transitive_interfaces(_super_klass, 6021 _local_interfaces, 6022 _loader_data, 6023 CHECK); 6024 6025 assert(_transitive_interfaces != NULL, "invariant"); 6026 6027 // sort methods 6028 _method_ordering = sort_methods(_methods); 6029 6030 _all_mirandas = new GrowableArray<Method*>(20); 6031 6032 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, 6033 &_num_miranda_methods, 6034 _all_mirandas, 6035 _super_klass, 6036 _methods, 6037 _access_flags, 6038 _major_version, 6039 _loader_data->class_loader(), 6040 _class_name, 6041 _local_interfaces, 6042 CHECK); 6043 6044 // Size of Java itable (in words) 6045 _itable_size = _access_flags.is_interface() ? 0 : 6046 klassItable::compute_itable_size(_transitive_interfaces); 6047 6048 assert(_fac != NULL, "invariant"); 6049 assert(_parsed_annotations != NULL, "invariant"); 6050 6051 _field_info = new FieldLayoutInfo(); 6052 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK); 6053 6054 // Compute reference typ 6055 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type(); 6056 6057} 6058 6059void ClassFileParser::set_klass(InstanceKlass* klass) { 6060 6061#ifdef ASSERT 6062 if (klass != NULL) { 6063 assert(NULL == _klass, "leaking?"); 6064 } 6065#endif 6066 6067 _klass = klass; 6068} 6069 6070void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 6071 6072#ifdef ASSERT 6073 if (klass != NULL) { 6074 assert(NULL == _klass_to_deallocate, "leaking?"); 6075 } 6076#endif 6077 6078 _klass_to_deallocate = klass; 6079} 6080 6081// Caller responsible for ResourceMark 6082// clone stream with rewound position 6083const ClassFileStream* ClassFileParser::clone_stream() const { 6084 assert(_stream != NULL, "invariant"); 6085 6086 return _stream->clone(); 6087} 6088// ---------------------------------------------------------------------------- 6089// debugging 6090 6091#ifdef ASSERT 6092 6093// return true if class_name contains no '.' (internal format is '/') 6094bool ClassFileParser::is_internal_format(Symbol* class_name) { 6095 if (class_name != NULL) { 6096 ResourceMark rm; 6097 char* name = class_name->as_C_string(); 6098 return strchr(name, '.') == NULL; 6099 } else { 6100 return true; 6101 } 6102} 6103 6104#endif 6105