Old src/share/vm/classfile/verifier.cpp (original) (raw)

1 /* 2 * Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 / 24 25 #include "precompiled.hpp" 26 #include "classfile/classFileStream.hpp" 27 #include "classfile/javaClasses.hpp" 28 #include "classfile/stackMapTable.hpp" 29 #include "classfile/stackMapFrame.hpp" 30 #include "classfile/stackMapTableFormat.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/verifier.hpp" 33 #include "classfile/vmSymbols.hpp" 34 #include "interpreter/bytecodes.hpp" 35 #include "interpreter/bytecodeStream.hpp" 36 #include "memory/oopFactory.hpp" 37 #include "memory/resourceArea.hpp" 38 #include "oops/instanceKlass.hpp" 39 #include "oops/oop.inline.hpp" 40 #include "oops/typeArrayOop.hpp" 41 #include "prims/jvm.h" 42 #include "runtime/fieldDescriptor.hpp" 43 #include "runtime/handles.inline.hpp" 44 #include "runtime/interfaceSupport.hpp" 45 #include "runtime/javaCalls.hpp" 46 #include "runtime/orderAccess.inline.hpp" 47 #include "runtime/os.hpp" 48 #include "runtime/thread.hpp" 49 #include "services/threadService.hpp" 50 #include "utilities/bytes.hpp" 51 52 #define NOFAILOVER_MAJOR_VERSION 51 53 #define NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION 51 54 #define STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION 52 55 56 // Access to external entry for VerifyClassCodes - old byte code verifier 57 58 extern "C" { 59 typedef jboolean (verify_byte_codes_fn_t)(JNIEnv , jclass, char , jint); 60 typedef jboolean (verify_byte_codes_fn_new_t)(JNIEnv , jclass, char , jint, jint); 61 } 62 63 static void volatile _verify_byte_codes_fn = NULL; 64 65 static volatile jint _is_new_verify_byte_codes_fn = (jint) true; 66 67 static void verify_byte_codes_fn() { 68 if (_verify_byte_codes_fn == NULL) { 69 void lib_handle = os::native_java_library(); 70 void func = os::dll_lookup(lib_handle, "VerifyClassCodesForMajorVersion"); 71 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func); 72 if (func == NULL) { 73 OrderAccess::release_store(&_is_new_verify_byte_codes_fn, false); 74 func = os::dll_lookup(lib_handle, "VerifyClassCodes"); 75 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func); 76 } 77 } 78 return (void)_verify_byte_codes_fn; 79 } 80 81 82 // Methods in Verifier 83 84 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) { 85 return (class_loader == NULL || !should_verify_class) ? 86 BytecodeVerificationLocal : BytecodeVerificationRemote; 87 } 88 89 bool Verifier::relax_verify_for(oop loader) { 90 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader); 91 bool need_verify = 92 // verifyAll 93 (BytecodeVerificationLocal && BytecodeVerificationRemote) || 94 // verifyRemote 95 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted); 96 return !need_verify; 97 } 98 99 void Verifier::trace_class_resolution(Klass resolve_class, InstanceKlass verify_class) { 100 assert(verify_class != NULL, "Unexpected null verify_class"); 101 ResourceMark rm; 102 Symbol s = verify_class->source_file_name(); 103 const char source_file = (s != NULL ? s->as_C_string() : NULL); 104 const char verify = verify_class->external_name(); 105 const char resolve = resolve_class->external_name(); 106 // print in a single call to reduce interleaving between threads 107 if (source_file != NULL) { 108 tty->print("RESOLVE %s %s %s (verification)\n", verify, resolve, source_file); 109 } else { 110 tty->print("RESOLVE %s %s (verification)\n", verify, resolve); 111 } 112 } 113 114 bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) { 115 HandleMark hm; 116 ResourceMark rm(THREAD); 117 118 // Eagerly allocate the identity hash code for a klass. This is a fallout 119 // from 6320749 and 8059924: hash code generator is not supposed to be called 120 // during the safepoint, but it allows to sneak the hashcode in during 121 // verification. Without this eager hashcode generation, we may end up 122 // installing the hashcode during some other operation, which may be at 123 // safepoint -- blowing up the checks. It was previously done as the side 124 // effect (sic!) for external_name(), but instead of doing that, we opt to 125 // explicitly push the hashcode in here. This is signify the following block 126 // is IMPORTANT: 127 if (klass->java_mirror() != NULL) { 128 klass->java_mirror()->identity_hash(); 129 } 130 131 if (!is_eligible_for_verification(klass, should_verify_class)) { 132 return true; 133 } 134 135 // Timer includes any side effects of class verification (resolution, 136 // etc), but not recursive calls to Verifier::verify(). 137 JavaThread* jt = (JavaThread*)THREAD; 138 PerfClassTraceTime timer(ClassLoader::perf_class_verify_time(), 139 ClassLoader::perf_class_verify_selftime(), 140 ClassLoader::perf_classes_verified(), 141 jt->get_thread_stat()->perf_recursion_counts_addr(), 142 jt->get_thread_stat()->perf_timers_addr(), 143 PerfClassTraceTime::CLASS_VERIFY); 144 145 // If the class should be verified, first see if we can use the split 146 // verifier. If not, or if verification fails and FailOverToOldVerifier 147 // is set, then call the inference verifier. 148 149 Symbol* exception_name = NULL; 150 const size_t message_buffer_len = klass->name()->utf8_length() + 1024; 151 char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len); 152 char* exception_message = message_buffer; 153 154 const char* klassName = klass->external_name(); 155 bool can_failover = FailOverToOldVerifier && 156 klass->major_version() < NOFAILOVER_MAJOR_VERSION; 157 158 if (TraceClassInitialization) { 159 tty->print_cr("Start class verification for: %s", klassName); 160 } 161 if (klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) { 162 ClassVerifier split_verifier(klass, THREAD); 163 split_verifier.verify_class(THREAD); 164 exception_name = split_verifier.result(); 165 if (can_failover && !HAS_PENDING_EXCEPTION && 166 (exception_name == vmSymbols::java_lang_VerifyError() || 167 exception_name == vmSymbols::java_lang_ClassFormatError())) { 168 if (TraceClassInitialization || VerboseVerification) { 169 tty->print_cr( 170 "Fail over class verification to old verifier for: %s", klassName); 171 } 172 exception_name = inference_verify( 173 klass, message_buffer, message_buffer_len, THREAD); 174 } 175 if (exception_name != NULL) { 176 exception_message = split_verifier.exception_message(); 177 } 178 } else { 179 exception_name = inference_verify( 180 klass, message_buffer, message_buffer_len, THREAD); 181 } 182 183 if (TraceClassInitialization || VerboseVerification) { 184 if (HAS_PENDING_EXCEPTION) { 185 tty->print("Verification for %s has", klassName); 186 tty->print_cr(" exception pending %s ", 187 PENDING_EXCEPTION->klass()->external_name()); 188 } else if (exception_name != NULL) { 189 tty->print_cr("Verification for %s failed", klassName); 190 } 191 tty->print_cr("End class verification for: %s", klassName); 192 } 193 194 if (HAS_PENDING_EXCEPTION) { 195 return false; // use the existing exception 196 } else if (exception_name == NULL) { 197 return true; // verifcation succeeded 198 } else { // VerifyError or ClassFormatError to be created and thrown 199 ResourceMark rm(THREAD); 200 instanceKlassHandle kls = 201 SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false); 202 if (TraceClassResolution) { 203 Verifier::trace_class_resolution(kls(), klass()); 204 } 205 206 while (!kls.is_null()) { 207 if (kls == klass) { 208 // If the class being verified is the exception we're creating 209 // or one of it's superclasses, we're in trouble and are going 210 // to infinitely recurse when we try to initialize the exception. 211 // So bail out here by throwing the preallocated VM error. 212 THROW_OOP_(Universe::virtual_machine_error_instance(), false); 213 } 214 kls = kls->super(); 215 } 216 message_buffer[message_buffer_len - 1] = '\0'; // just to be sure 217 THROW_MSG_(exception_name, exception_message, false); 218 } 219 } 220 221 bool Verifier::is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class) { 222 Symbol* name = klass->name(); 223 Klass* refl_magic_klass = SystemDictionary::reflect_MagicAccessorImpl_klass(); 224 225 bool is_reflect = refl_magic_klass != NULL && klass->is_subtype_of(refl_magic_klass); 226 227 return (should_verify_for(klass->class_loader(), should_verify_class) && 228 // return if the class is a bootstrapping class 229 // or defineClass specified not to verify by default (flags override passed arg) 230 // We need to skip the following four for bootstraping 231 name != vmSymbols::java_lang_Object() && 232 name != vmSymbols::java_lang_Class() && 233 name != vmSymbols::java_lang_String() && 234 name != vmSymbols::java_lang_Throwable() && 235 236 // Can not verify the bytecodes for shared classes because they have 237 // already been rewritten to contain constant pool cache indices, 238 // which the verifier can't understand. 239 // Shared classes shouldn't have stackmaps either. 240 !klass()->is_shared() && 241 242 // As of the fix for 4486457 we disable verification for all of the 243 // dynamically-generated bytecodes associated with the 1.4 244 // reflection implementation, not just those associated with 245 // sun/reflect/SerializationConstructorAccessor. 246 // NOTE: this is called too early in the bootstrapping process to be 247 // guarded by Universe::is_gte_jdk14x_version(). 248 // Also for lambda generated code, gte jdk8 249 (!is_reflect)); 250 } 251 252 Symbol* Verifier::inference_verify( 253 instanceKlassHandle klass, char* message, size_t message_len, TRAPS) { 254 JavaThread* thread = (JavaThread*)THREAD; 255 JNIEnv env = thread->jni_environment(); 256 257 void verify_func = verify_byte_codes_fn(); 258 259 if (verify_func == NULL) { 260 jio_snprintf(message, message_len, "Could not link verifier"); 261 return vmSymbols::java_lang_VerifyError(); 262 } 263 264 ResourceMark rm(THREAD); 265 if (VerboseVerification) { 266 tty->print_cr("Verifying class %s with old format", klass->external_name()); 267 } 268 269 jclass cls = (jclass) JNIHandles::make_local(env, klass->java_mirror()); 270 jint result; 271 272 { 273 HandleMark hm(thread); 274 ThreadToNativeFromVM ttn(thread); 275 // ThreadToNativeFromVM takes care of changing thread_state, so safepoint 276 // code knows that we have left the VM 277 278 if (is_new_verify_byte_codes_fn) { 279 verify_byte_codes_fn_new_t func = 280 CAST_TO_FN_PTR(verify_byte_codes_fn_new_t, verify_func); 281 result = (*func)(env, cls, message, (int)message_len, 282 klass->major_version()); 283 } else { 284 verify_byte_codes_fn_t func = 285 CAST_TO_FN_PTR(verify_byte_codes_fn_t, verify_func); 286 result = (*func)(env, cls, message, (int)message_len); 287 } 288 } 289 290 JNIHandles::destroy_local(cls); 291 292 // These numbers are chosen so that VerifyClassCodes interface doesn't need 293 // to be changed (still return jboolean (unsigned char)), and result is 294 // 1 when verification is passed. 295 if (result == 0) { 296 return vmSymbols::java_lang_VerifyError(); 297 } else if (result == 1) { 298 return NULL; // verified. 299 } else if (result == 2) { 300 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), message, NULL); 301 } else if (result == 3) { 302 return vmSymbols::java_lang_ClassFormatError(); 303 } else { 304 ShouldNotReachHere(); 305 return NULL; 306 } 307 } 308 309 TypeOrigin TypeOrigin::null() { 310 return TypeOrigin(); 311 } 312 TypeOrigin TypeOrigin::local(u2 index, StackMapFrame* frame) { 313 assert(frame != NULL, "Must have a frame"); 314 return TypeOrigin(CF_LOCALS, index, StackMapFrame::copy(frame), 315 frame->local_at(index)); 316 } 317 TypeOrigin TypeOrigin::stack(u2 index, StackMapFrame* frame) { 318 assert(frame != NULL, "Must have a frame"); 319 return TypeOrigin(CF_STACK, index, StackMapFrame::copy(frame), 320 frame->stack_at(index)); 321 } 322 TypeOrigin TypeOrigin::sm_local(u2 index, StackMapFrame* frame) { 323 assert(frame != NULL, "Must have a frame"); 324 return TypeOrigin(SM_LOCALS, index, StackMapFrame::copy(frame), 325 frame->local_at(index)); 326 } 327 TypeOrigin TypeOrigin::sm_stack(u2 index, StackMapFrame* frame) { 328 assert(frame != NULL, "Must have a frame"); 329 return TypeOrigin(SM_STACK, index, StackMapFrame::copy(frame), 330 frame->stack_at(index)); 331 } 332 TypeOrigin TypeOrigin::bad_index(u2 index) { 333 return TypeOrigin(BAD_INDEX, index, NULL, VerificationType::bogus_type()); 334 } 335 TypeOrigin TypeOrigin::cp(u2 index, VerificationType vt) { 336 return TypeOrigin(CONST_POOL, index, NULL, vt); 337 } 338 TypeOrigin TypeOrigin::signature(VerificationType vt) { 339 return TypeOrigin(SIG, 0, NULL, vt); 340 } 341 TypeOrigin TypeOrigin::implicit(VerificationType t) { 342 return TypeOrigin(IMPLICIT, 0, NULL, t); 343 } 344 TypeOrigin TypeOrigin::frame(StackMapFrame* frame) { 345 return TypeOrigin(FRAME_ONLY, 0, StackMapFrame::copy(frame), 346 VerificationType::bogus_type()); 347 } 348 349 void TypeOrigin::reset_frame() { 350 if (_frame != NULL) { 351 _frame->restore(); 352 } 353 } 354 355 void TypeOrigin::details(outputStream* ss) const { 356 _type.print_on(ss); 357 switch (_origin) { 358 case CF_LOCALS: 359 ss->print(" (current frame, locals[%d])", _index); 360 break; 361 case CF_STACK: 362 ss->print(" (current frame, stack[%d])", _index); 363 break; 364 case SM_LOCALS: 365 ss->print(" (stack map, locals[%d])", _index); 366 break; 367 case SM_STACK: 368 ss->print(" (stack map, stack[%d])", _index); 369 break; 370 case CONST_POOL: 371 ss->print(" (constant pool %d)", _index); 372 break; 373 case SIG: 374 ss->print(" (from method signature)"); 375 break; 376 case IMPLICIT: 377 case FRAME_ONLY: 378 case NONE: 379 default: 380 ; 381 } 382 } 383 384 #ifdef ASSERT 385 void TypeOrigin::print_on(outputStream* str) const { 386 str->print("{%d,%d,%p:", _origin, _index, _frame); 387 if (_frame != NULL) { 388 _frame->print_on(str); 389 } else { 390 str->print("null"); 391 } 392 str->print(","); 393 _type.print_on(str); 394 str->print("}"); 395 } 396 #endif 397 398 void ErrorContext::details(outputStream* ss, const Method* method) const { 399 if (is_valid()) { 400 ss->cr(); 401 ss->print_cr("Exception Details:"); 402 location_details(ss, method); 403 reason_details(ss); 404 frame_details(ss); 405 bytecode_details(ss, method); 406 handler_details(ss, method); 407 stackmap_details(ss, method); 408 } 409 } 410 411 void ErrorContext::reason_details(outputStream* ss) const { 412 streamIndentor si(ss); 413 ss->indent().print_cr("Reason:"); 414 streamIndentor si2(ss); 415 ss->indent().print("%s", ""); 416 switch (_fault) { 417 case INVALID_BYTECODE: 418 ss->print("Error exists in the bytecode"); 419 break; 420 case WRONG_TYPE: 421 if (_expected.is_valid()) { 422 ss->print("Type "); 423 _type.details(ss); 424 ss->print(" is not assignable to "); 425 _expected.details(ss); 426 } else { 427 ss->print("Invalid type: "); 428 _type.details(ss); 429 } 430 break; 431 case FLAGS_MISMATCH: 432 if (_expected.is_valid()) { 433 ss->print("Current frame's flags are not assignable " 434 "to stack map frame's."); 435 } else { 436 ss->print("Current frame's flags are invalid in this context."); 437 } 438 break; 439 case BAD_CP_INDEX: 440 ss->print("Constant pool index %d is invalid", _type.index()); 441 break; 442 case BAD_LOCAL_INDEX: 443 ss->print("Local index %d is invalid", _type.index()); 444 break; 445 case LOCALS_SIZE_MISMATCH: 446 ss->print("Current frame's local size doesn't match stackmap."); 447 break; 448 case STACK_SIZE_MISMATCH: 449 ss->print("Current frame's stack size doesn't match stackmap."); 450 break; 451 case STACK_OVERFLOW: 452 ss->print("Exceeded max stack size."); 453 break; 454 case STACK_UNDERFLOW: 455 ss->print("Attempt to pop empty stack."); 456 break; 457 case MISSING_STACKMAP: 458 ss->print("Expected stackmap frame at this location."); 459 break; 460 case BAD_STACKMAP: 461 ss->print("Invalid stackmap specification."); 462 break; 463 case UNKNOWN: 464 default: 465 ShouldNotReachHere(); 466 ss->print_cr("Unknown"); 467 } 468 ss->cr(); 469 } 470 471 void ErrorContext::location_details(outputStream* ss, const Method* method) const { 472 if (_bci != -1 && method != NULL) { 473 streamIndentor si(ss); 474 const char* bytecode_name = ""; 475 if (method->validate_bci(_bci) != -1) { 476 Bytecodes::Code code = Bytecodes::code_or_bp_at(method->bcp_from(_bci)); 477 if (Bytecodes::is_defined(code)) { 478 bytecode_name = Bytecodes::name(code); 479 } else { 480 bytecode_name = ""; 481 } 482 } 483 InstanceKlass* ik = method->method_holder(); 484 ss->indent().print_cr("Location:"); 485 streamIndentor si2(ss); 486 ss->indent().print_cr("%s.%s%s @%d: %s", 487 ik->name()->as_C_string(), method->name()->as_C_string(), 488 method->signature()->as_C_string(), _bci, bytecode_name); 489 } 490 } 491 492 void ErrorContext::frame_details(outputStream* ss) const { 493 streamIndentor si(ss); 494 if (_type.is_valid() && _type.frame() != NULL) { 495 ss->indent().print_cr("Current Frame:"); 496 streamIndentor si2(ss); 497 _type.frame()->print_on(ss); 498 } 499 if (_expected.is_valid() && _expected.frame() != NULL) { 500 ss->indent().print_cr("Stackmap Frame:"); 501 streamIndentor si2(ss); 502 _expected.frame()->print_on(ss); 503 } 504 } 505 506 void ErrorContext::bytecode_details(outputStream* ss, const Method* method) const { 507 if (method != NULL) { 508 streamIndentor si(ss); 509 ss->indent().print_cr("Bytecode:"); 510 streamIndentor si2(ss); 511 ss->print_data(method->code_base(), method->code_size(), false); 512 } 513 } 514 515 void ErrorContext::handler_details(outputStream* ss, const Method* method) const { 516 if (method != NULL) { 517 streamIndentor si(ss); 518 ExceptionTable table(method); 519 if (table.length() > 0) { 520 ss->indent().print_cr("Exception Handler Table:"); 521 streamIndentor si2(ss); 522 for (int i = 0; i < table.length(); ++i) { 523 ss->indent().print_cr("bci [%d, %d] => handler: %d", table.start_pc(i), 524 table.end_pc(i), table.handler_pc(i)); 525 } 526 } 527 } 528 } 529 530 void ErrorContext::stackmap_details(outputStream* ss, const Method* method) const { 531 if (method != NULL && method->has_stackmap_table()) { 532 streamIndentor si(ss); 533 ss->indent().print_cr("Stackmap Table:"); 534 Array* data = method->stackmap_data(); 535 stack_map_table* sm_table = 536 stack_map_table::at((address)data->adr_at(0)); 537 stack_map_frame* sm_frame = sm_table->entries(); 538 streamIndentor si2(ss); 539 int current_offset = -1; 540 for (u2 i = 0; i < sm_table->number_of_entries(); ++i) { 541 ss->indent(); 542 sm_frame->print_on(ss, current_offset); 543 ss->cr(); 544 current_offset += sm_frame->offset_delta(); 545 sm_frame = sm_frame->next(); 546 } 547 } 548 } 549 550 // Methods in ClassVerifier 551 552 ClassVerifier::ClassVerifier( 553 instanceKlassHandle klass, TRAPS) 554 : _thread(THREAD), _exception_type(NULL), _message(NULL), _klass(klass) { 555 _this_type = VerificationType::reference_type(klass->name()); 556 // Create list to hold symbols in reference area. 557 _symbols = new GrowableArray<Symbol*>(100, 0, NULL); 558 } 559 560 ClassVerifier::~ClassVerifier() { 561 // Decrement the reference count for any symbols created. 562 for (int i = 0; i < _symbols->length(); i++) { 563 Symbol* s = _symbols->at(i); 564 s->decrement_refcount(); 565 } 566 } 567 568 VerificationType ClassVerifier::object_type() const { 569 return VerificationType::reference_type(vmSymbols::java_lang_Object()); 570 } 571 572 TypeOrigin ClassVerifier::ref_ctx(const char* sig, TRAPS) { 573 VerificationType vt = VerificationType::reference_type( 574 create_temporary_symbol(sig, (int)strlen(sig), THREAD)); 575 return TypeOrigin::implicit(vt); 576 } 577 578 void ClassVerifier::verify_class(TRAPS) { 579 if (VerboseVerification) { 580 tty->print_cr("Verifying class %s with new format", 581 _klass->external_name()); 582 } 583 584 Array<Method*>* methods = _klass->methods(); 585 int num_methods = methods->length(); 586 587 for (int index = 0; index < num_methods; index++) { 588 // Check for recursive re-verification before each method. 589 if (was_recursively_verified()) return; 590 591 Method* m = methods->at(index); 592 if (m->is_native() || m->is_abstract() || m->is_overpass()) { 593 // If m is native or abstract, skip it. It is checked in class file 594 // parser that methods do not override a final method. Overpass methods 595 // are trusted since the VM generates them. 596 continue; 597 } 598 verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this)); 599 } 600 601 if (VerboseVerification || TraceClassInitialization) { 602 if (was_recursively_verified()) 603 tty->print_cr("Recursive verification detected for: %s", 604 _klass->external_name()); 605 } 606 } 607 608 void ClassVerifier::verify_method(const methodHandle& m, TRAPS) { 609 HandleMark hm(THREAD); 610 _method = m; // initialize _method 611 if (VerboseVerification) { 612 tty->print_cr("Verifying method %s", m->name_and_sig_as_C_string()); 613 } 614 615 // For clang, the only good constant format string is a literal constant format string. 616 #define bad_type_msg "Bad type on operand stack in %s" 617 618 int32_t max_stack = m->verifier_max_stack(); 619 int32_t max_locals = m->max_locals(); 620 constantPoolHandle cp(THREAD, m->constants()); 621 622 if (!SignatureVerifier::is_valid_method_signature(m->signature())) { 623 class_format_error("Invalid method signature"); 624 return; 625 } 626 627 // Initial stack map frame: offset is 0, stack is initially empty. 628 StackMapFrame current_frame(max_locals, max_stack, this); 629 // Set initial locals 630 VerificationType return_type = current_frame.set_locals_from_arg( 631 m, current_type(), CHECK_VERIFY(this)); 632 633 int32_t stackmap_index = 0; // index to the stackmap array 634 635 u4 code_length = m->code_size(); 636 637 // Scan the bytecode and map each instruction's start offset to a number. 638 char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this)); 639 640 int ex_min = code_length; 641 int ex_max = -1; 642 // Look through each item on the exception table. Each of the fields must refer 643 // to a legal instruction. 644 verify_exception_handler_table( 645 code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this)); 646 647 // Look through each entry on the local variable table and make sure 648 // its range of code array offsets is valid. (4169817) 649 if (m->has_localvariable_table()) { 650 verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this)); 651 } 652 653 Array* stackmap_data = m->stackmap_data(); 654 StackMapStream stream(stackmap_data); 655 StackMapReader reader(this, &stream, code_data, code_length, THREAD); 656 StackMapTable stackmap_table(&reader, &current_frame, max_locals, max_stack, 657 code_data, code_length, CHECK_VERIFY(this)); 658 659 if (VerboseVerification) { 660 stackmap_table.print_on(tty); 661 } 662 663 RawBytecodeStream bcs(m); 664 665 // Scan the byte code linearly from the start to the end 666 bool no_control_flow = false; // Set to true when there is no direct control 667 // flow from current instruction to the next 668 // instruction in sequence 669 670 Bytecodes::Code opcode; 671 while (!bcs.is_last_bytecode()) { 672 // Check for recursive re-verification before each bytecode. 673 if (was_recursively_verified()) return; 674 675 opcode = bcs.raw_next(); 676 u2 bci = bcs.bci(); 677 678 // Set current frame's offset to bci 679 current_frame.set_offset(bci); 680 current_frame.set_mark(); 681 682 // Make sure every offset in stackmap table point to the beginning to 683 // an instruction. Match current_frame to stackmap_table entry with 684 // the same offset if exists. 685 stackmap_index = verify_stackmap_table( 686 stackmap_index, bci, &current_frame, &stackmap_table, 687 no_control_flow, CHECK_VERIFY(this)); 688 689 690 bool this_uninit = false; // Set to true when invokespecial initialized 'this' 691 bool verified_exc_handlers = false; 692 693 // Merge with the next instruction 694 { 695 u2 index; 696 int target; 697 VerificationType type, type2; 698 VerificationType atype; 699 700 #ifndef PRODUCT 701 if (VerboseVerification) { 702 current_frame.print_on(tty); 703 tty->print_cr("offset = %d, opcode = %s", bci, Bytecodes::name(opcode)); 704 } 705 #endif 706 707 // Make sure wide instruction is in correct format 708 if (bcs.is_wide()) { 709 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload && 710 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload && 711 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore && 712 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload && 713 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore && 714 opcode != Bytecodes::_dstore) { 715 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal' 716 * if we encounter a wide instruction that modifies an invalid 717 * opcode (not one of the ones listed above) / 718 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction"); 719 return; 720 } 721 } 722 723 // Look for possible jump target in exception handlers and see if it 724 // matches current_frame. Do this check here for astore, dstore*, 725 // fstore*, istore*, and lstore* opcodes because they can change the type 726 // state by adding a local. JVM Spec says that the incoming type state 727 // should be used for this check. So, do the check here before a possible 728 // local is added to the type state. 729 if (Bytecodes::is_store_into_local(opcode) && bci >= ex_min && bci < ex_max) { 730 verify_exception_handler_targets( 731 bci, this_uninit, &current_frame, &stackmap_table, CHECK_VERIFY(this)); 732 verified_exc_handlers = true; 733 } 734 735 switch (opcode) { 736 case Bytecodes::_nop : 737 no_control_flow = false; break; 738 case Bytecodes::_aconst_null : 739 current_frame.push_stack( 740 VerificationType::null_type(), CHECK_VERIFY(this)); 741 no_control_flow = false; break; 742 case Bytecodes::_iconst_m1 : 743 case Bytecodes::_iconst_0 : 744 case Bytecodes::_iconst_1 : 745 case Bytecodes::_iconst_2 : 746 case Bytecodes::_iconst_3 : 747 case Bytecodes::_iconst_4 : 748 case Bytecodes::_iconst_5 : 749 current_frame.push_stack( 750 VerificationType::integer_type(), CHECK_VERIFY(this)); 751 no_control_flow = false; break; 752 case Bytecodes::_lconst_0 : 753 case Bytecodes::_lconst_1 : 754 current_frame.push_stack_2( 755 VerificationType::long_type(), 756 VerificationType::long2_type(), CHECK_VERIFY(this)); 757 no_control_flow = false; break; 758 case Bytecodes::_fconst_0 : 759 case Bytecodes::_fconst_1 : 760 case Bytecodes::_fconst_2 : 761 current_frame.push_stack( 762 VerificationType::float_type(), CHECK_VERIFY(this)); 763 no_control_flow = false; break; 764 case Bytecodes::_dconst_0 : 765 case Bytecodes::_dconst_1 : 766 current_frame.push_stack_2( 767 VerificationType::double_type(), 768 VerificationType::double2_type(), CHECK_VERIFY(this)); 769 no_control_flow = false; break; 770 case Bytecodes::_sipush : 771 case Bytecodes::_bipush : 772 current_frame.push_stack( 773 VerificationType::integer_type(), CHECK_VERIFY(this)); 774 no_control_flow = false; break; 775 case Bytecodes::_ldc : 776 verify_ldc( 777 opcode, bcs.get_index_u1(), &current_frame, 778 cp, bci, CHECK_VERIFY(this)); 779 no_control_flow = false; break; 780 case Bytecodes::_ldc_w : 781 case Bytecodes::_ldc2_w : 782 verify_ldc( 783 opcode, bcs.get_index_u2(), &current_frame, 784 cp, bci, CHECK_VERIFY(this)); 785 no_control_flow = false; break; 786 case Bytecodes::_iload : 787 verify_iload(bcs.get_index(), &current_frame, CHECK_VERIFY(this)); 788 no_control_flow = false; break; 789 case Bytecodes::_iload_0 : 790 case Bytecodes::_iload_1 : 791 case Bytecodes::_iload_2 : 792 case Bytecodes::_iload_3 : 793 index = opcode - Bytecodes::_iload_0; 794 verify_iload(index, &current_frame, CHECK_VERIFY(this)); 795 no_control_flow = false; break; 796 case Bytecodes::_lload : 797 verify_lload(bcs.get_index(), &current_frame, CHECK_VERIFY(this)); 798 no_control_flow = false; break; 799 case Bytecodes::_lload_0 : 800 case Bytecodes::_lload_1 : 801 case Bytecodes::_lload_2 : 802 case Bytecodes::_lload_3 : 803 index = opcode - Bytecodes::_lload_0; 804 verify_lload(index, &current_frame, CHECK_VERIFY(this)); 805 no_control_flow = false; break; 806 case Bytecodes::_fload : 807 verify_fload(bcs.get_index(), &current_frame, CHECK_VERIFY(this)); 808 no_control_flow = false; break; 809 case Bytecodes::_fload_0 : 810 case Bytecodes::_fload_1 : 811 case Bytecodes::_fload_2 : 812 case Bytecodes::_fload_3 : 813 index = opcode - Bytecodes::_fload_0; 814 verify_fload(index, &current_frame, CHECK_VERIFY(this)); 815 no_control_flow = false; break; 816 case Bytecodes::_dload : 817 verify_dload(bcs.get_index(), &current_frame, CHECK_VERIFY(this)); 818 no_control_flow = false; break; 819 case Bytecodes::_dload_0 : 820 case Bytecodes::_dload_1 : 821 case Bytecodes::_dload_2 : 822 case Bytecodes::_dload_3 : 823 index = opcode - Bytecodes::_dload_0; 824 verify_dload(index, &current_frame, CHECK_VERIFY(this)); 825 no_control_flow = false; break; 826 case Bytecodes::_aload : 827 verify_aload(bcs.get_index(), &current_frame, CHECK_VERIFY(this)); 828 no_control_flow = false; break; 829 case Bytecodes::_aload_0 : 830 case Bytecodes::_aload_1 : 831 case Bytecodes::_aload_2 : 832 case Bytecodes::_aload_3 : 833 index = opcode - Bytecodes::_aload_0; 834 verify_aload(index, &current_frame, CHECK_VERIFY(this)); 835 no_control_flow = false; break; 836 case Bytecodes::_iaload : 837 type = current_frame.pop_stack( 838 VerificationType::integer_type(), CHECK_VERIFY(this)); 839 atype = current_frame.pop_stack( 840 VerificationType::reference_check(), CHECK_VERIFY(this)); 841 if (!atype.is_int_array()) { 842 verify_error(ErrorContext::bad_type(bci, 843 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)), 844 bad_type_msg, "iaload"); 845 return; 846 } 847 current_frame.push_stack( 848 VerificationType::integer_type(), CHECK_VERIFY(this)); 849 no_control_flow = false; break; 850 case Bytecodes::_baload : 851 type = current_frame.pop_stack( 852 VerificationType::integer_type(), CHECK_VERIFY(this)); 853 atype = current_frame.pop_stack( 854 VerificationType::reference_check(), CHECK_VERIFY(this)); 855 if (!atype.is_bool_array() && !atype.is_byte_array()) { 856 verify_error( 857 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()), 858 bad_type_msg, "baload"); 859 return; 860 } 861 current_frame.push_stack( 862 VerificationType::integer_type(), CHECK_VERIFY(this)); 863 no_control_flow = false; break; 864 case Bytecodes::_caload : 865 type = current_frame.pop_stack( 866 VerificationType::integer_type(), CHECK_VERIFY(this)); 867 atype = current_frame.pop_stack( 868 VerificationType::reference_check(), CHECK_VERIFY(this)); 869 if (!atype.is_char_array()) { 870 verify_error(ErrorContext::bad_type(bci, 871 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)), 872 bad_type_msg, "caload"); 873 return; 874 } 875 current_frame.push_stack( 876 VerificationType::integer_type(), CHECK_VERIFY(this)); 877 no_control_flow = false; break; 878 case Bytecodes::_saload : 879 type = current_frame.pop_stack( 880 VerificationType::integer_type(), CHECK_VERIFY(this)); 881 atype = current_frame.pop_stack( 882 VerificationType::reference_check(), CHECK_VERIFY(this)); 883 if (!atype.is_short_array()) { 884 verify_error(ErrorContext::bad_type(bci, 885 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)), 886 bad_type_msg, "saload"); 887 return; 888 } 889 current_frame.push_stack( 890 VerificationType::integer_type(), CHECK_VERIFY(this)); 891 no_control_flow = false; break; 892 case Bytecodes::_laload : 893 type = current_frame.pop_stack( 894 VerificationType::integer_type(), CHECK_VERIFY(this)); 895 atype = current_frame.pop_stack( 896 VerificationType::reference_check(), CHECK_VERIFY(this)); 897 if (!atype.is_long_array()) { 898 verify_error(ErrorContext::bad_type(bci, 899 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)), 900 bad_type_msg, "laload"); 901 return; 902 } 903 current_frame.push_stack_2( 904 VerificationType::long_type(), 905 VerificationType::long2_type(), CHECK_VERIFY(this)); 906 no_control_flow = false; break; 907 case Bytecodes::_faload : 908 type = current_frame.pop_stack( 909 VerificationType::integer_type(), CHECK_VERIFY(this)); 910 atype = current_frame.pop_stack( 911 VerificationType::reference_check(), CHECK_VERIFY(this)); 912 if (!atype.is_float_array()) { 913 verify_error(ErrorContext::bad_type(bci, 914 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)), 915 bad_type_msg, "faload"); 916 return; 917 } 918 current_frame.push_stack( 919 VerificationType::float_type(), CHECK_VERIFY(this)); 920 no_control_flow = false; break; 921 case Bytecodes::_daload : 922 type = current_frame.pop_stack( 923 VerificationType::integer_type(), CHECK_VERIFY(this)); 924 atype = current_frame.pop_stack( 925 VerificationType::reference_check(), CHECK_VERIFY(this)); 926 if (!atype.is_double_array()) { 927 verify_error(ErrorContext::bad_type(bci, 928 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)), 929 bad_type_msg, "daload"); 930 return; 931 } 932 current_frame.push_stack_2( 933 VerificationType::double_type(), 934 VerificationType::double2_type(), CHECK_VERIFY(this)); 935 no_control_flow = false; break; 936 case Bytecodes::_aaload : { 937 type = current_frame.pop_stack( 938 VerificationType::integer_type(), CHECK_VERIFY(this)); 939 atype = current_frame.pop_stack( 940 VerificationType::reference_check(), CHECK_VERIFY(this)); 941 if (!atype.is_reference_array()) { 942 verify_error(ErrorContext::bad_type(bci, 943 current_frame.stack_top_ctx(), 944 TypeOrigin::implicit(VerificationType::reference_check())), 945 bad_type_msg, "aaload"); 946 return; 947 } 948 if (atype.is_null()) { 949 current_frame.push_stack( 950 VerificationType::null_type(), CHECK_VERIFY(this)); 951 } else { 952 VerificationType component = 953 atype.get_component(this, CHECK_VERIFY(this)); 954 current_frame.push_stack(component, CHECK_VERIFY(this)); 955 } 956 no_control_flow = false; break; 957 } 958 case Bytecodes::_istore : 959 verify_istore(bcs.get_index(), &current_frame, CHECK_VERIFY(this)); 960 no_control_flow = false; break; 961 case Bytecodes::_istore_0 : 962 case Bytecodes::_istore_1 : 963 case Bytecodes::_istore_2 : 964 case Bytecodes::_istore_3 : 965 index = opcode - Bytecodes::_istore_0; 966 verify_istore(index, &current_frame, CHECK_VERIFY(this)); 967 no_control_flow = false; break; 968 case Bytecodes::_lstore : 969 verify_lstore(bcs.get_index(), &current_frame, CHECK_VERIFY(this)); 970 no_control_flow = false; break; 971 case Bytecodes::_lstore_0 : 972 case Bytecodes::_lstore_1 : 973 case Bytecodes::_lstore_2 : 974 case Bytecodes::_lstore_3 : 975 index = opcode - Bytecodes::_lstore_0; 976 verify_lstore(index, &current_frame, CHECK_VERIFY(this)); 977 no_control_flow = false; break; 978 case Bytecodes::_fstore : 979 verify_fstore(bcs.get_index(), &current_frame, CHECK_VERIFY(this)); 980 no_control_flow = false; break; 981 case Bytecodes::_fstore_0 : 982 case Bytecodes::_fstore_1 : 983 case Bytecodes::_fstore_2 : 984 case Bytecodes::_fstore_3 : 985 index = opcode - Bytecodes::_fstore_0; 986 verify_fstore(index, &current_frame, CHECK_VERIFY(this)); 987 no_control_flow = false; break; 988 case Bytecodes::_dstore : 989 verify_dstore(bcs.get_index(), &current_frame, CHECK_VERIFY(this)); 990 no_control_flow = false; break; 991 case Bytecodes::_dstore_0 : 992 case Bytecodes::_dstore_1 : 993 case Bytecodes::_dstore_2 : 994 case Bytecodes::_dstore_3 : 995 index = opcode - Bytecodes::_dstore_0; 996 verify_dstore(index, &current_frame, CHECK_VERIFY(this)); 997 no_control_flow = false; break; 998 case Bytecodes::_astore : 999 verify_astore(bcs.get_index(), &current_frame, CHECK_VERIFY(this)); 1000 no_control_flow = false; break; 1001 case Bytecodes::_astore_0 : 1002 case Bytecodes::_astore_1 : 1003 case Bytecodes::_astore_2 : 1004 case Bytecodes::_astore_3 : 1005 index = opcode - Bytecodes::_astore_0; 1006 verify_astore(index, &current_frame, CHECK_VERIFY(this)); 1007 no_control_flow = false; break; 1008 case Bytecodes::_iastore : 1009 type = current_frame.pop_stack( 1010 VerificationType::integer_type(), CHECK_VERIFY(this)); 1011 type2 = current_frame.pop_stack( 1012 VerificationType::integer_type(), CHECK_VERIFY(this)); 1013 atype = current_frame.pop_stack( 1014 VerificationType::reference_check(), CHECK_VERIFY(this)); 1015 if (!atype.is_int_array()) { 1016 verify_error(ErrorContext::bad_type(bci, 1017 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)), 1018 bad_type_msg, "iastore"); 1019 return; 1020 } 1021 no_control_flow = false; break; 1022 case Bytecodes::_bastore : 1023 type = current_frame.pop_stack( 1024 VerificationType::integer_type(), CHECK_VERIFY(this)); 1025 type2 = current_frame.pop_stack( 1026 VerificationType::integer_type(), CHECK_VERIFY(this)); 1027 atype = current_frame.pop_stack( 1028 VerificationType::reference_check(), CHECK_VERIFY(this)); 1029 if (!atype.is_bool_array() && !atype.is_byte_array()) { 1030 verify_error( 1031 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()), 1032 bad_type_msg, "bastore"); 1033 return; 1034 } 1035 no_control_flow = false; break; 1036 case Bytecodes::_castore : 1037 current_frame.pop_stack( 1038 VerificationType::integer_type(), CHECK_VERIFY(this)); 1039 current_frame.pop_stack( 1040 VerificationType::integer_type(), CHECK_VERIFY(this)); 1041 atype = current_frame.pop_stack( 1042 VerificationType::reference_check(), CHECK_VERIFY(this)); 1043 if (!atype.is_char_array()) { 1044 verify_error(ErrorContext::bad_type(bci, 1045 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)), 1046 bad_type_msg, "castore"); 1047 return; 1048 } 1049 no_control_flow = false; break; 1050 case Bytecodes::_sastore : 1051 current_frame.pop_stack( 1052 VerificationType::integer_type(), CHECK_VERIFY(this)); 1053 current_frame.pop_stack( 1054 VerificationType::integer_type(), CHECK_VERIFY(this)); 1055 atype = current_frame.pop_stack( 1056 VerificationType::reference_check(), CHECK_VERIFY(this)); 1057 if (!atype.is_short_array()) { 1058 verify_error(ErrorContext::bad_type(bci, 1059 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)), 1060 bad_type_msg, "sastore"); 1061 return; 1062 } 1063 no_control_flow = false; break; 1064 case Bytecodes::_lastore : 1065 current_frame.pop_stack_2( 1066 VerificationType::long2_type(), 1067 VerificationType::long_type(), CHECK_VERIFY(this)); 1068 current_frame.pop_stack( 1069 VerificationType::integer_type(), CHECK_VERIFY(this)); 1070 atype = current_frame.pop_stack( 1071 VerificationType::reference_check(), CHECK_VERIFY(this)); 1072 if (!atype.is_long_array()) { 1073 verify_error(ErrorContext::bad_type(bci, 1074 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)), 1075 bad_type_msg, "lastore"); 1076 return; 1077 } 1078 no_control_flow = false; break; 1079 case Bytecodes::_fastore : 1080 current_frame.pop_stack( 1081 VerificationType::float_type(), CHECK_VERIFY(this)); 1082 current_frame.pop_stack 1083 (VerificationType::integer_type(), CHECK_VERIFY(this)); 1084 atype = current_frame.pop_stack( 1085 VerificationType::reference_check(), CHECK_VERIFY(this)); 1086 if (!atype.is_float_array()) { 1087 verify_error(ErrorContext::bad_type(bci, 1088 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)), 1089 bad_type_msg, "fastore"); 1090 return; 1091 } 1092 no_control_flow = false; break; 1093 case Bytecodes::_dastore : 1094 current_frame.pop_stack_2( 1095 VerificationType::double2_type(), 1096 VerificationType::double_type(), CHECK_VERIFY(this)); 1097 current_frame.pop_stack( 1098 VerificationType::integer_type(), CHECK_VERIFY(this)); 1099 atype = current_frame.pop_stack( 1100 VerificationType::reference_check(), CHECK_VERIFY(this)); 1101 if (!atype.is_double_array()) { 1102 verify_error(ErrorContext::bad_type(bci, 1103 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)), 1104 bad_type_msg, "dastore"); 1105 return; 1106 } 1107 no_control_flow = false; break; 1108 case Bytecodes::_aastore : 1109 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this)); 1110 type2 = current_frame.pop_stack( 1111 VerificationType::integer_type(), CHECK_VERIFY(this)); 1112 atype = current_frame.pop_stack( 1113 VerificationType::reference_check(), CHECK_VERIFY(this)); 1114 // more type-checking is done at runtime 1115 if (!atype.is_reference_array()) { 1116 verify_error(ErrorContext::bad_type(bci, 1117 current_frame.stack_top_ctx(), 1118 TypeOrigin::implicit(VerificationType::reference_check())), 1119 bad_type_msg, "aastore"); 1120 return; 1121 } 1122 // 4938384: relaxed constraint in JVMS 3nd edition. 1123 no_control_flow = false; break; 1124 case Bytecodes::_pop : 1125 current_frame.pop_stack( 1126 VerificationType::category1_check(), CHECK_VERIFY(this)); 1127 no_control_flow = false; break; 1128 case Bytecodes::_pop2 : 1129 type = current_frame.pop_stack(CHECK_VERIFY(this)); 1130 if (type.is_category1()) { 1131 current_frame.pop_stack( 1132 VerificationType::category1_check(), CHECK_VERIFY(this)); 1133 } else if (type.is_category2_2nd()) { 1134 current_frame.pop_stack( 1135 VerificationType::category2_check(), CHECK_VERIFY(this)); 1136 } else { 1137 /* Unreachable? Would need a category2_1st on TOS 1138 * which does not appear possible. / 1139 verify_error( 1140 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()), 1141 bad_type_msg, "pop2"); 1142 return; 1143 } 1144 no_control_flow = false; break; 1145 case Bytecodes::_dup : 1146 type = current_frame.pop_stack( 1147 VerificationType::category1_check(), CHECK_VERIFY(this)); 1148 current_frame.push_stack(type, CHECK_VERIFY(this)); 1149 current_frame.push_stack(type, CHECK_VERIFY(this)); 1150 no_control_flow = false; break; 1151 case Bytecodes::_dup_x1 : 1152 type = current_frame.pop_stack( 1153 VerificationType::category1_check(), CHECK_VERIFY(this)); 1154 type2 = current_frame.pop_stack( 1155 VerificationType::category1_check(), CHECK_VERIFY(this)); 1156 current_frame.push_stack(type, CHECK_VERIFY(this)); 1157 current_frame.push_stack(type2, CHECK_VERIFY(this)); 1158 current_frame.push_stack(type, CHECK_VERIFY(this)); 1159 no_control_flow = false; break; 1160 case Bytecodes::_dup_x2 : 1161 { 1162 VerificationType type3; 1163 type = current_frame.pop_stack( 1164 VerificationType::category1_check(), CHECK_VERIFY(this)); 1165 type2 = current_frame.pop_stack(CHECK_VERIFY(this)); 1166 if (type2.is_category1()) { 1167 type3 = current_frame.pop_stack( 1168 VerificationType::category1_check(), CHECK_VERIFY(this)); 1169 } else if (type2.is_category2_2nd()) { 1170 type3 = current_frame.pop_stack( 1171 VerificationType::category2_check(), CHECK_VERIFY(this)); 1172 } else { 1173 /* Unreachable? Would need a category2_1st at stack depth 2 with 1174 * a category1 on TOS which does not appear possible. / 1175 verify_error(ErrorContext::bad_type( 1176 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2"); 1177 return; 1178 } 1179 current_frame.push_stack(type, CHECK_VERIFY(this)); 1180 current_frame.push_stack(type3, CHECK_VERIFY(this)); 1181 current_frame.push_stack(type2, CHECK_VERIFY(this)); 1182 current_frame.push_stack(type, CHECK_VERIFY(this)); 1183 no_control_flow = false; break; 1184 } 1185 case Bytecodes::_dup2 : 1186 type = current_frame.pop_stack(CHECK_VERIFY(this)); 1187 if (type.is_category1()) { 1188 type2 = current_frame.pop_stack( 1189 VerificationType::category1_check(), CHECK_VERIFY(this)); 1190 } else if (type.is_category2_2nd()) { 1191 type2 = current_frame.pop_stack( 1192 VerificationType::category2_check(), CHECK_VERIFY(this)); 1193 } else { 1194 / Unreachable? Would need a category2_1st on TOS which does not 1195 * appear possible. / 1196 verify_error( 1197 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()), 1198 bad_type_msg, "dup2"); 1199 return; 1200 } 1201 current_frame.push_stack(type2, CHECK_VERIFY(this)); 1202 current_frame.push_stack(type, CHECK_VERIFY(this)); 1203 current_frame.push_stack(type2, CHECK_VERIFY(this)); 1204 current_frame.push_stack(type, CHECK_VERIFY(this)); 1205 no_control_flow = false; break; 1206 case Bytecodes::_dup2_x1 : 1207 { 1208 VerificationType type3; 1209 type = current_frame.pop_stack(CHECK_VERIFY(this)); 1210 if (type.is_category1()) { 1211 type2 = current_frame.pop_stack( 1212 VerificationType::category1_check(), CHECK_VERIFY(this)); 1213 } else if (type.is_category2_2nd()) { 1214 type2 = current_frame.pop_stack( 1215 VerificationType::category2_check(), CHECK_VERIFY(this)); 1216 } else { 1217 / Unreachable? Would need a category2_1st on TOS which does 1218 * not appear possible. / 1219 verify_error( 1220 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()), 1221 bad_type_msg, "dup2_x1"); 1222 return; 1223 } 1224 type3 = current_frame.pop_stack( 1225 VerificationType::category1_check(), CHECK_VERIFY(this)); 1226 current_frame.push_stack(type2, CHECK_VERIFY(this)); 1227 current_frame.push_stack(type, CHECK_VERIFY(this)); 1228 current_frame.push_stack(type3, CHECK_VERIFY(this)); 1229 current_frame.push_stack(type2, CHECK_VERIFY(this)); 1230 current_frame.push_stack(type, CHECK_VERIFY(this)); 1231 no_control_flow = false; break; 1232 } 1233 case Bytecodes::_dup2_x2 : 1234 { 1235 VerificationType type3, type4; 1236 type = current_frame.pop_stack(CHECK_VERIFY(this)); 1237 if (type.is_category1()) { 1238 type2 = current_frame.pop_stack( 1239 VerificationType::category1_check(), CHECK_VERIFY(this)); 1240 } else if (type.is_category2_2nd()) { 1241 type2 = current_frame.pop_stack( 1242 VerificationType::category2_check(), CHECK_VERIFY(this)); 1243 } else { 1244 / Unreachable? Would need a category2_1st on TOS which does 1245 * not appear possible. / 1246 verify_error( 1247 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()), 1248 bad_type_msg, "dup2_x2"); 1249 return; 1250 } 1251 type3 = current_frame.pop_stack(CHECK_VERIFY(this)); 1252 if (type3.is_category1()) { 1253 type4 = current_frame.pop_stack( 1254 VerificationType::category1_check(), CHECK_VERIFY(this)); 1255 } else if (type3.is_category2_2nd()) { 1256 type4 = current_frame.pop_stack( 1257 VerificationType::category2_check(), CHECK_VERIFY(this)); 1258 } else { 1259 / Unreachable? Would need a category2_1st on TOS after popping 1260 * a long/double or two category 1's, which does not 1261 * appear possible. */ 1262 verify_error( 1263 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()), 1264 bad_type_msg, "dup2_x2"); 1265 return; 1266 } 1267 current_frame.push_stack(type2, CHECK_VERIFY(this)); 1268 current_frame.push_stack(type, CHECK_VERIFY(this)); 1269 current_frame.push_stack(type4, CHECK_VERIFY(this)); 1270 current_frame.push_stack(type3, CHECK_VERIFY(this)); 1271 current_frame.push_stack(type2, CHECK_VERIFY(this)); 1272 current_frame.push_stack(type, CHECK_VERIFY(this)); 1273 no_control_flow = false; break; 1274 } 1275 case Bytecodes::_swap : 1276 type = current_frame.pop_stack( 1277 VerificationType::category1_check(), CHECK_VERIFY(this)); 1278 type2 = current_frame.pop_stack( 1279 VerificationType::category1_check(), CHECK_VERIFY(this)); 1280 current_frame.push_stack(type, CHECK_VERIFY(this)); 1281 current_frame.push_stack(type2, CHECK_VERIFY(this)); 1282 no_control_flow = false; break; 1283 case Bytecodes::_iadd : 1284 case Bytecodes::_isub : 1285 case Bytecodes::_imul : 1286 case Bytecodes::_idiv : 1287 case Bytecodes::_irem : 1288 case Bytecodes::_ishl : 1289 case Bytecodes::_ishr : 1290 case Bytecodes::_iushr : 1291 case Bytecodes::_ior : 1292 case Bytecodes::_ixor : 1293 case Bytecodes::_iand : 1294 current_frame.pop_stack( 1295 VerificationType::integer_type(), CHECK_VERIFY(this)); 1296 // fall through 1297 case Bytecodes::_ineg : 1298 current_frame.pop_stack( 1299 VerificationType::integer_type(), CHECK_VERIFY(this)); 1300 current_frame.push_stack( 1301 VerificationType::integer_type(), CHECK_VERIFY(this)); 1302 no_control_flow = false; break; 1303 case Bytecodes::_ladd : 1304 case Bytecodes::_lsub : 1305 case Bytecodes::_lmul : 1306 case Bytecodes::_ldiv : 1307 case Bytecodes::_lrem : 1308 case Bytecodes::_land : 1309 case Bytecodes::_lor : 1310 case Bytecodes::_lxor : 1311 current_frame.pop_stack_2( 1312 VerificationType::long2_type(), 1313 VerificationType::long_type(), CHECK_VERIFY(this)); 1314 // fall through 1315 case Bytecodes::_lneg : 1316 current_frame.pop_stack_2( 1317 VerificationType::long2_type(), 1318 VerificationType::long_type(), CHECK_VERIFY(this)); 1319 current_frame.push_stack_2( 1320 VerificationType::long_type(), 1321 VerificationType::long2_type(), CHECK_VERIFY(this)); 1322 no_control_flow = false; break; 1323 case Bytecodes::_lshl : 1324 case Bytecodes::_lshr : 1325 case Bytecodes::_lushr : 1326 current_frame.pop_stack( 1327 VerificationType::integer_type(), CHECK_VERIFY(this)); 1328 current_frame.pop_stack_2( 1329 VerificationType::long2_type(), 1330 VerificationType::long_type(), CHECK_VERIFY(this)); 1331 current_frame.push_stack_2( 1332 VerificationType::long_type(), 1333 VerificationType::long2_type(), CHECK_VERIFY(this)); 1334 no_control_flow = false; break; 1335 case Bytecodes::_fadd : 1336 case Bytecodes::_fsub : 1337 case Bytecodes::_fmul : 1338 case Bytecodes::_fdiv : 1339 case Bytecodes::_frem : 1340 current_frame.pop_stack( 1341 VerificationType::float_type(), CHECK_VERIFY(this)); 1342 // fall through 1343 case Bytecodes::_fneg : 1344 current_frame.pop_stack( 1345 VerificationType::float_type(), CHECK_VERIFY(this)); 1346 current_frame.push_stack( 1347 VerificationType::float_type(), CHECK_VERIFY(this)); 1348 no_control_flow = false; break; 1349 case Bytecodes::_dadd : 1350 case Bytecodes::_dsub : 1351 case Bytecodes::_dmul : 1352 case Bytecodes::_ddiv : 1353 case Bytecodes::_drem : 1354 current_frame.pop_stack_2( 1355 VerificationType::double2_type(), 1356 VerificationType::double_type(), CHECK_VERIFY(this)); 1357 // fall through 1358 case Bytecodes::_dneg : 1359 current_frame.pop_stack_2( 1360 VerificationType::double2_type(), 1361 VerificationType::double_type(), CHECK_VERIFY(this)); 1362 current_frame.push_stack_2( 1363 VerificationType::double_type(), 1364 VerificationType::double2_type(), CHECK_VERIFY(this)); 1365 no_control_flow = false; break; 1366 case Bytecodes::_iinc : 1367 verify_iinc(bcs.get_index(), &current_frame, CHECK_VERIFY(this)); 1368 no_control_flow = false; break; 1369 case Bytecodes::_i2l : 1370 type = current_frame.pop_stack( 1371 VerificationType::integer_type(), CHECK_VERIFY(this)); 1372 current_frame.push_stack_2( 1373 VerificationType::long_type(), 1374 VerificationType::long2_type(), CHECK_VERIFY(this)); 1375 no_control_flow = false; break; 1376 case Bytecodes::_l2i : 1377 current_frame.pop_stack_2( 1378 VerificationType::long2_type(), 1379 VerificationType::long_type(), CHECK_VERIFY(this)); 1380 current_frame.push_stack( 1381 VerificationType::integer_type(), CHECK_VERIFY(this)); 1382 no_control_flow = false; break; 1383 case Bytecodes::_i2f : 1384 current_frame.pop_stack( 1385 VerificationType::integer_type(), CHECK_VERIFY(this)); 1386 current_frame.push_stack( 1387 VerificationType::float_type(), CHECK_VERIFY(this)); 1388 no_control_flow = false; break; 1389 case Bytecodes::_i2d : 1390 current_frame.pop_stack( 1391 VerificationType::integer_type(), CHECK_VERIFY(this)); 1392 current_frame.push_stack_2( 1393 VerificationType::double_type(), 1394 VerificationType::double2_type(), CHECK_VERIFY(this)); 1395 no_control_flow = false; break; 1396 case Bytecodes::_l2f : 1397 current_frame.pop_stack_2( 1398 VerificationType::long2_type(), 1399 VerificationType::long_type(), CHECK_VERIFY(this)); 1400 current_frame.push_stack( 1401 VerificationType::float_type(), CHECK_VERIFY(this)); 1402 no_control_flow = false; break; 1403 case Bytecodes::_l2d : 1404 current_frame.pop_stack_2( 1405 VerificationType::long2_type(), 1406 VerificationType::long_type(), CHECK_VERIFY(this)); 1407 current_frame.push_stack_2( 1408 VerificationType::double_type(), 1409 VerificationType::double2_type(), CHECK_VERIFY(this)); 1410 no_control_flow = false; break; 1411 case Bytecodes::_f2i : 1412 current_frame.pop_stack( 1413 VerificationType::float_type(), CHECK_VERIFY(this)); 1414 current_frame.push_stack( 1415 VerificationType::integer_type(), CHECK_VERIFY(this)); 1416 no_control_flow = false; break; 1417 case Bytecodes::_f2l : 1418 current_frame.pop_stack( 1419 VerificationType::float_type(), CHECK_VERIFY(this)); 1420 current_frame.push_stack_2( 1421 VerificationType::long_type(), 1422 VerificationType::long2_type(), CHECK_VERIFY(this)); 1423 no_control_flow = false; break; 1424 case Bytecodes::_f2d : 1425 current_frame.pop_stack( 1426 VerificationType::float_type(), CHECK_VERIFY(this)); 1427 current_frame.push_stack_2( 1428 VerificationType::double_type(), 1429 VerificationType::double2_type(), CHECK_VERIFY(this)); 1430 no_control_flow = false; break; 1431 case Bytecodes::_d2i : 1432 current_frame.pop_stack_2( 1433 VerificationType::double2_type(), 1434 VerificationType::double_type(), CHECK_VERIFY(this)); 1435 current_frame.push_stack( 1436 VerificationType::integer_type(), CHECK_VERIFY(this)); 1437 no_control_flow = false; break; 1438 case Bytecodes::_d2l : 1439 current_frame.pop_stack_2( 1440 VerificationType::double2_type(), 1441 VerificationType::double_type(), CHECK_VERIFY(this)); 1442 current_frame.push_stack_2( 1443 VerificationType::long_type(), 1444 VerificationType::long2_type(), CHECK_VERIFY(this)); 1445 no_control_flow = false; break; 1446 case Bytecodes::_d2f : 1447 current_frame.pop_stack_2( 1448 VerificationType::double2_type(), 1449 VerificationType::double_type(), CHECK_VERIFY(this)); 1450 current_frame.push_stack( 1451 VerificationType::float_type(), CHECK_VERIFY(this)); 1452 no_control_flow = false; break; 1453 case Bytecodes::_i2b : 1454 case Bytecodes::_i2c : 1455 case Bytecodes::_i2s : 1456 current_frame.pop_stack( 1457 VerificationType::integer_type(), CHECK_VERIFY(this)); 1458 current_frame.push_stack( 1459 VerificationType::integer_type(), CHECK_VERIFY(this)); 1460 no_control_flow = false; break; 1461 case Bytecodes::_lcmp : 1462 current_frame.pop_stack_2( 1463 VerificationType::long2_type(), 1464 VerificationType::long_type(), CHECK_VERIFY(this)); 1465 current_frame.pop_stack_2( 1466 VerificationType::long2_type(), 1467 VerificationType::long_type(), CHECK_VERIFY(this)); 1468 current_frame.push_stack( 1469 VerificationType::integer_type(), CHECK_VERIFY(this)); 1470 no_control_flow = false; break; 1471 case Bytecodes::_fcmpl : 1472 case Bytecodes::_fcmpg : 1473 current_frame.pop_stack( 1474 VerificationType::float_type(), CHECK_VERIFY(this)); 1475 current_frame.pop_stack( 1476 VerificationType::float_type(), CHECK_VERIFY(this)); 1477 current_frame.push_stack( 1478 VerificationType::integer_type(), CHECK_VERIFY(this)); 1479 no_control_flow = false; break; 1480 case Bytecodes::_dcmpl : 1481 case Bytecodes::_dcmpg : 1482 current_frame.pop_stack_2( 1483 VerificationType::double2_type(), 1484 VerificationType::double_type(), CHECK_VERIFY(this)); 1485 current_frame.pop_stack_2( 1486 VerificationType::double2_type(), 1487 VerificationType::double_type(), CHECK_VERIFY(this)); 1488 current_frame.push_stack( 1489 VerificationType::integer_type(), CHECK_VERIFY(this)); 1490 no_control_flow = false; break; 1491 case Bytecodes::_if_icmpeq: 1492 case Bytecodes::_if_icmpne: 1493 case Bytecodes::_if_icmplt: 1494 case Bytecodes::_if_icmpge: 1495 case Bytecodes::_if_icmpgt: 1496 case Bytecodes::_if_icmple: 1497 current_frame.pop_stack( 1498 VerificationType::integer_type(), CHECK_VERIFY(this)); 1499 // fall through 1500 case Bytecodes::_ifeq: 1501 case Bytecodes::_ifne: 1502 case Bytecodes::_iflt: 1503 case Bytecodes::_ifge: 1504 case Bytecodes::_ifgt: 1505 case Bytecodes::_ifle: 1506 current_frame.pop_stack( 1507 VerificationType::integer_type(), CHECK_VERIFY(this)); 1508 target = bcs.dest(); 1509 stackmap_table.check_jump_target( 1510 &current_frame, target, CHECK_VERIFY(this)); 1511 no_control_flow = false; break; 1512 case Bytecodes::_if_acmpeq : 1513 case Bytecodes::_if_acmpne : 1514 current_frame.pop_stack( 1515 VerificationType::reference_check(), CHECK_VERIFY(this)); 1516 // fall through 1517 case Bytecodes::_ifnull : 1518 case Bytecodes::_ifnonnull : 1519 current_frame.pop_stack( 1520 VerificationType::reference_check(), CHECK_VERIFY(this)); 1521 target = bcs.dest(); 1522 stackmap_table.check_jump_target 1523 (&current_frame, target, CHECK_VERIFY(this)); 1524 no_control_flow = false; break; 1525 case Bytecodes::_goto : 1526 target = bcs.dest(); 1527 stackmap_table.check_jump_target( 1528 &current_frame, target, CHECK_VERIFY(this)); 1529 no_control_flow = true; break; 1530 case Bytecodes::_goto_w : 1531 target = bcs.dest_w(); 1532 stackmap_table.check_jump_target( 1533 &current_frame, target, CHECK_VERIFY(this)); 1534 no_control_flow = true; break; 1535 case Bytecodes::_tableswitch : 1536 case Bytecodes::_lookupswitch : 1537 verify_switch( 1538 &bcs, code_length, code_data, &current_frame, 1539 &stackmap_table, CHECK_VERIFY(this)); 1540 no_control_flow = true; break; 1541 case Bytecodes::_ireturn : 1542 type = current_frame.pop_stack( 1543 VerificationType::integer_type(), CHECK_VERIFY(this)); 1544 verify_return_value(return_type, type, bci, 1545 &current_frame, CHECK_VERIFY(this)); 1546 no_control_flow = true; break; 1547 case Bytecodes::_lreturn : 1548 type2 = current_frame.pop_stack( 1549 VerificationType::long2_type(), CHECK_VERIFY(this)); 1550 type = current_frame.pop_stack( 1551 VerificationType::long_type(), CHECK_VERIFY(this)); 1552 verify_return_value(return_type, type, bci, 1553 &current_frame, CHECK_VERIFY(this)); 1554 no_control_flow = true; break; 1555 case Bytecodes::_freturn : 1556 type = current_frame.pop_stack( 1557 VerificationType::float_type(), CHECK_VERIFY(this)); 1558 verify_return_value(return_type, type, bci, 1559 &current_frame, CHECK_VERIFY(this)); 1560 no_control_flow = true; break; 1561 case Bytecodes::_dreturn : 1562 type2 = current_frame.pop_stack( 1563 VerificationType::double2_type(), CHECK_VERIFY(this)); 1564 type = current_frame.pop_stack( 1565 VerificationType::double_type(), CHECK_VERIFY(this)); 1566 verify_return_value(return_type, type, bci, 1567 &current_frame, CHECK_VERIFY(this)); 1568 no_control_flow = true; break; 1569 case Bytecodes::_areturn : 1570 type = current_frame.pop_stack( 1571 VerificationType::reference_check(), CHECK_VERIFY(this)); 1572 verify_return_value(return_type, type, bci, 1573 &current_frame, CHECK_VERIFY(this)); 1574 no_control_flow = true; break; 1575 case Bytecodes::_return : 1576 if (return_type != VerificationType::bogus_type()) { 1577 verify_error(ErrorContext::bad_code(bci), 1578 "Method expects a return value"); 1579 return; 1580 } 1581 // Make sure "this" has been initialized if current method is an 1582 // . 1583 if (_method->name() == vmSymbols::object_initializer_name() && 1584 current_frame.flag_this_uninit()) { 1585 verify_error(ErrorContext::bad_code(bci), 1586 "Constructor must call super() or this() " 1587 "before return"); 1588 return; 1589 } 1590 no_control_flow = true; break; 1591 case Bytecodes::_getstatic : 1592 case Bytecodes::_putstatic : 1593 // pass TRUE, operand can be an array type for getstatic/putstatic. 1594 verify_field_instructions( 1595 &bcs, &current_frame, cp, true, CHECK_VERIFY(this)); 1596 no_control_flow = false; break; 1597 case Bytecodes::_getfield : 1598 case Bytecodes::_putfield : 1599 // pass FALSE, operand can't be an array type for getfield/putfield. 1600 verify_field_instructions( 1601 &bcs, &current_frame, cp, false, CHECK_VERIFY(this)); 1602 no_control_flow = false; break; 1603 case Bytecodes::_invokevirtual : 1604 case Bytecodes::_invokespecial : 1605 case Bytecodes::_invokestatic : 1606 verify_invoke_instructions( 1607 &bcs, code_length, &current_frame, (bci >= ex_min && bci < ex_max), 1608 &this_uninit, return_type, cp, &stackmap_table, CHECK_VERIFY(this)); 1609 no_control_flow = false; break; 1610 case Bytecodes::_invokeinterface : 1611 case Bytecodes::_invokedynamic : 1612 verify_invoke_instructions( 1613 &bcs, code_length, &current_frame, (bci >= ex_min && bci < ex_max), 1614 &this_uninit, return_type, cp, &stackmap_table, CHECK_VERIFY(this)); 1615 no_control_flow = false; break; 1616 case Bytecodes::_new : 1617 { 1618 index = bcs.get_index_u2(); 1619 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this)); 1620 VerificationType new_class_type = 1621 cp_index_to_type(index, cp, CHECK_VERIFY(this)); 1622 if (!new_class_type.is_object()) { 1623 verify_error(ErrorContext::bad_type(bci, 1624 TypeOrigin::cp(index, new_class_type)), 1625 "Illegal new instruction"); 1626 return; 1627 } 1628 type = VerificationType::uninitialized_type(bci); 1629 current_frame.push_stack(type, CHECK_VERIFY(this)); 1630 no_control_flow = false; break; 1631 } 1632 case Bytecodes::_newarray : 1633 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this)); 1634 current_frame.pop_stack( 1635 VerificationType::integer_type(), CHECK_VERIFY(this)); 1636 current_frame.push_stack(type, CHECK_VERIFY(this)); 1637 no_control_flow = false; break; 1638 case Bytecodes::_anewarray : 1639 verify_anewarray( 1640 bci, bcs.get_index_u2(), cp, &current_frame, CHECK_VERIFY(this)); 1641 no_control_flow = false; break; 1642 case Bytecodes::_arraylength : 1643 type = current_frame.pop_stack( 1644 VerificationType::reference_check(), CHECK_VERIFY(this)); 1645 if (!(type.is_null() || type.is_array())) { 1646 verify_error(ErrorContext::bad_type( 1647 bci, current_frame.stack_top_ctx()), 1648 bad_type_msg, "arraylength"); 1649 } 1650 current_frame.push_stack( 1651 VerificationType::integer_type(), CHECK_VERIFY(this)); 1652 no_control_flow = false; break; 1653 case Bytecodes::_checkcast : 1654 { 1655 index = bcs.get_index_u2(); 1656 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this)); 1657 current_frame.pop_stack(object_type(), CHECK_VERIFY(this)); 1658 VerificationType klass_type = cp_index_to_type( 1659 index, cp, CHECK_VERIFY(this)); 1660 current_frame.push_stack(klass_type, CHECK_VERIFY(this)); 1661 no_control_flow = false; break; 1662 } 1663 case Bytecodes::_instanceof : { 1664 index = bcs.get_index_u2(); 1665 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this)); 1666 current_frame.pop_stack(object_type(), CHECK_VERIFY(this)); 1667 current_frame.push_stack( 1668 VerificationType::integer_type(), CHECK_VERIFY(this)); 1669 no_control_flow = false; break; 1670 } 1671 case Bytecodes::_monitorenter : 1672 case Bytecodes::_monitorexit : 1673 current_frame.pop_stack( 1674 VerificationType::reference_check(), CHECK_VERIFY(this)); 1675 no_control_flow = false; break; 1676 case Bytecodes::_multianewarray : 1677 { 1678 index = bcs.get_index_u2(); 1679 u2 dim = *(bcs.bcp()+3); 1680 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this)); 1681 VerificationType new_array_type = 1682 cp_index_to_type(index, cp, CHECK_VERIFY(this)); 1683 if (!new_array_type.is_array()) { 1684 verify_error(ErrorContext::bad_type(bci, 1685 TypeOrigin::cp(index, new_array_type)), 1686 "Illegal constant pool index in multianewarray instruction"); 1687 return; 1688 } 1689 if (dim < 1 || new_array_type.dimensions() < dim) { 1690 verify_error(ErrorContext::bad_code(bci), 1691 "Illegal dimension in multianewarray instruction: %d", dim); 1692 return; 1693 } 1694 for (int i = 0; i < dim; i++) { 1695 current_frame.pop_stack( 1696 VerificationType::integer_type(), CHECK_VERIFY(this)); 1697 } 1698 current_frame.push_stack(new_array_type, CHECK_VERIFY(this)); 1699 no_control_flow = false; break; 1700 } 1701 case Bytecodes::_athrow : 1702 type = VerificationType::reference_type( 1703 vmSymbols::java_lang_Throwable()); 1704 current_frame.pop_stack(type, CHECK_VERIFY(this)); 1705 no_control_flow = true; break; 1706 default: 1707 // We only need to check the valid bytecodes in class file. 1708 // And jsr and ret are not in the new class file format in JDK1.5. 1709 verify_error(ErrorContext::bad_code(bci), 1710 "Bad instruction: %02x", opcode); 1711 no_control_flow = false; 1712 return; 1713 } // end switch 1714 } // end Merge with the next instruction 1715 1716 // Look for possible jump target in exception handlers and see if it matches 1717 // current_frame. Don't do this check if it has already been done (for 1718 // ([a,d,f,i,l]store* opcodes). This check cannot be done earlier because 1719 // opcodes, such as invokespecial, may set the this_uninit flag. 1720 assert(!(verified_exc_handlers && this_uninit), 1721 "Exception handler targets got verified before this_uninit got set"); 1722 if (!verified_exc_handlers && bci >= ex_min && bci < ex_max) { 1723 verify_exception_handler_targets( 1724 bci, this_uninit, &current_frame, &stackmap_table, CHECK_VERIFY(this)); 1725 } 1726 } // end while 1727 1728 // Make sure that control flow does not fall through end of the method 1729 if (!no_control_flow) { 1730 verify_error(ErrorContext::bad_code(code_length), 1731 "Control flow falls through code end"); 1732 return; 1733 } 1734 } 1735 1736 #undef bad_type_message 1737 1738 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) { 1739 char* code_data = NEW_RESOURCE_ARRAY(char, code_length); 1740 memset(code_data, 0, sizeof(char) * code_length); 1741 RawBytecodeStream bcs(m); 1742 1743 while (!bcs.is_last_bytecode()) { 1744 if (bcs.raw_next() != Bytecodes::_illegal) { 1745 int bci = bcs.bci(); 1746 if (bcs.raw_code() == Bytecodes::_new) { 1747 code_data[bci] = NEW_OFFSET; 1748 } else { 1749 code_data[bci] = BYTECODE_OFFSET; 1750 } 1751 } else { 1752 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction"); 1753 return NULL; 1754 } 1755 } 1756 1757 return code_data; 1758 } 1759 1760 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) { 1761 ExceptionTable exhandlers(_method()); 1762 int exlength = exhandlers.length(); 1763 constantPoolHandle cp (THREAD, _method->constants()); 1764 1765 for(int i = 0; i < exlength; i++) { 1766 u2 start_pc = exhandlers.start_pc(i); 1767 u2 end_pc = exhandlers.end_pc(i); 1768 u2 handler_pc = exhandlers.handler_pc(i); 1769 if (start_pc >= code_length || code_data[start_pc] == 0) { 1770 class_format_error("Illegal exception table start_pc %d", start_pc); 1771 return; 1772 } 1773 if (end_pc != code_length) { // special case: end_pc == code_length 1774 if (end_pc > code_length || code_data[end_pc] == 0) { 1775 class_format_error("Illegal exception table end_pc %d", end_pc); 1776 return; 1777 } 1778 } 1779 if (handler_pc >= code_length || code_data[handler_pc] == 0) { 1780 class_format_error("Illegal exception table handler_pc %d", handler_pc); 1781 return; 1782 } 1783 int catch_type_index = exhandlers.catch_type_index(i); 1784 if (catch_type_index != 0) { 1785 VerificationType catch_type = cp_index_to_type( 1786 catch_type_index, cp, CHECK_VERIFY(this)); 1787 VerificationType throwable = 1788 VerificationType::reference_type(vmSymbols::java_lang_Throwable()); 1789 bool is_subclass = throwable.is_assignable_from( 1790 catch_type, this, false, CHECK_VERIFY(this)); 1791 if (!is_subclass) { 1792 // 4286534: should throw VerifyError according to recent spec change 1793 verify_error(ErrorContext::bad_type(handler_pc, 1794 TypeOrigin::cp(catch_type_index, catch_type), 1795 TypeOrigin::implicit(throwable)), 1796 "Catch type is not a subclass " 1797 "of Throwable in exception handler %d", handler_pc); 1798 return; 1799 } 1800 } 1801 if (start_pc < min) min = start_pc; 1802 if (end_pc > max) max = end_pc; 1803 } 1804 } 1805 1806 void ClassVerifier::verify_local_variable_table(u4 code_length, char code_data, TRAPS) { 1807 int localvariable_table_length = _method()->localvariable_table_length(); 1808 if (localvariable_table_length > 0) { 1809 LocalVariableTableElement* table = method()->localvariable_table_start(); 1810 for (int i = 0; i < localvariable_table_length; i++) { 1811 u2 start_bci = table[i].start_bci; 1812 u2 length = table[i].length; 1813 1814 if (start_bci >= code_length || code_data[start_bci] == 0) { 1815 class_format_error( 1816 "Illegal local variable table start_pc %d", start_bci); 1817 return; 1818 } 1819 u4 end_bci = (u4)(start_bci + length); 1820 if (end_bci != code_length) { 1821 if (end_bci >= code_length || code_data[end_bci] == 0) { 1822 class_format_error( "Illegal local variable table length %d", length); 1823 return; 1824 } 1825 } 1826 } 1827 } 1828 } 1829 1830 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci, 1831 StackMapFrame* current_frame, 1832 StackMapTable* stackmap_table, 1833 bool no_control_flow, TRAPS) { 1834 if (stackmap_index < stackmap_table->get_frame_count()) { 1835 u2 this_offset = stackmap_table->get_offset(stackmap_index); 1836 if (no_control_flow && this_offset > bci) { 1837 verify_error(ErrorContext::missing_stackmap(bci), 1838 "Expecting a stack map frame"); 1839 return 0; 1840 } 1841 if (this_offset == bci) { 1842 ErrorContext ctx; 1843 // See if current stack map can be assigned to the frame in table. 1844 // current_frame is the stackmap frame got from the last instruction. 1845 // If matched, current_frame will be updated by this method. 1846 bool matches = stackmap_table->match_stackmap( 1847 current_frame, this_offset, stackmap_index, 1848 !no_control_flow, true, false, &ctx, CHECK_VERIFY(this, 0)); 1849 if (!matches) { 1850 // report type error 1851 verify_error(ctx, "Instruction type does not match stack map"); 1852 return 0; 1853 } 1854 stackmap_index++; 1855 } else if (this_offset < bci) { 1856 // current_offset should have met this_offset. 1857 class_format_error("Bad stack map offset %d", this_offset); 1858 return 0; 1859 } 1860 } else if (no_control_flow) { 1861 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame"); 1862 return 0; 1863 } 1864 return stackmap_index; 1865 } 1866 1867 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame, 1868 StackMapTable* stackmap_table, TRAPS) { 1869 constantPoolHandle cp (THREAD, _method->constants()); 1870 ExceptionTable exhandlers(_method()); 1871 int exlength = exhandlers.length(); 1872 for(int i = 0; i < exlength; i++) { 1873 u2 start_pc = exhandlers.start_pc(i); 1874 u2 end_pc = exhandlers.end_pc(i); 1875 u2 handler_pc = exhandlers.handler_pc(i); 1876 int catch_type_index = exhandlers.catch_type_index(i); 1877 if(bci >= start_pc && bci < end_pc) { 1878 u1 flags = current_frame->flags(); 1879 if (this_uninit) { flags |= FLAG_THIS_UNINIT; } 1880 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags); 1881 if (catch_type_index != 0) { 1882 // We know that this index refers to a subclass of Throwable 1883 VerificationType catch_type = cp_index_to_type( 1884 catch_type_index, cp, CHECK_VERIFY(this)); 1885 new_frame->push_stack(catch_type, CHECK_VERIFY(this)); 1886 } else { 1887 VerificationType throwable = 1888 VerificationType::reference_type(vmSymbols::java_lang_Throwable()); 1889 new_frame->push_stack(throwable, CHECK_VERIFY(this)); 1890 } 1891 ErrorContext ctx; 1892 bool matches = stackmap_table->match_stackmap( 1893 new_frame, handler_pc, true, false, true, &ctx, CHECK_VERIFY(this)); 1894 if (!matches) { 1895 verify_error(ctx, "Stack map does not match the one at " 1896 "exception handler %d", handler_pc); 1897 return; 1898 } 1899 } 1900 } 1901 } 1902 1903 void ClassVerifier::verify_cp_index( 1904 u2 bci, const constantPoolHandle& cp, int index, TRAPS) { 1905 int nconstants = cp->length(); 1906 if ((index <= 0) || (index >= nconstants)) { 1907 verify_error(ErrorContext::bad_cp_index(bci, index), 1908 "Illegal constant pool index %d in class %s", 1909 index, cp->pool_holder()->external_name()); 1910 return; 1911 } 1912 } 1913 1914 void ClassVerifier::verify_cp_type( 1915 u2 bci, int index, const constantPoolHandle& cp, unsigned int types, TRAPS) { 1916 1917 // In some situations, bytecode rewriting may occur while we're verifying. 1918 // In this case, a constant pool cache exists and some indices refer to that 1919 // instead. Be sure we don't pick up such indices by accident. 1920 // We must check was_recursively_verified() before we get here. 1921 guarantee(cp->cache() == NULL, "not rewritten yet"); 1922 1923 verify_cp_index(bci, cp, index, CHECK_VERIFY(this)); 1924 unsigned int tag = cp->tag_at(index).value(); 1925 if ((types & (1 << tag)) == 0) { 1926 verify_error(ErrorContext::bad_cp_index(bci, index), 1927 "Illegal type at constant pool entry %d in class %s", 1928 index, cp->pool_holder()->external_name()); 1929 return; 1930 } 1931 } 1932 1933 void ClassVerifier::verify_cp_class_type( 1934 u2 bci, int index, const constantPoolHandle& cp, TRAPS) { 1935 verify_cp_index(bci, cp, index, CHECK_VERIFY(this)); 1936 constantTag tag = cp->tag_at(index); 1937 if (!tag.is_klass() && !tag.is_unresolved_klass()) { 1938 verify_error(ErrorContext::bad_cp_index(bci, index), 1939 "Illegal type at constant pool entry %d in class %s", 1940 index, cp->pool_holder()->external_name()); 1941 return; 1942 } 1943 } 1944 1945 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) { 1946 stringStream ss; 1947 1948 ctx.reset_frames(); 1949 _exception_type = vmSymbols::java_lang_VerifyError(); 1950 _error_context = ctx; 1951 va_list va; 1952 va_start(va, msg); 1953 ss.vprint(msg, va); 1954 va_end(va); 1955 _message = ss.as_string(); 1956 #ifdef ASSERT 1957 ResourceMark rm; 1958 const char* exception_name = _exception_type->as_C_string(); 1959 Exceptions::debug_check_abort(exception_name, NULL); 1960 #endif // ndef ASSERT 1961 } 1962 1963 void ClassVerifier::class_format_error(const char* msg, ...) { 1964 stringStream ss; 1965 _exception_type = vmSymbols::java_lang_ClassFormatError(); 1966 va_list va; 1967 va_start(va, msg); 1968 ss.vprint(msg, va); 1969 va_end(va); 1970 if (!_method.is_null()) { 1971 ss.print(" in method %s", _method->name_and_sig_as_C_string()); 1972 } 1973 _message = ss.as_string(); 1974 } 1975 1976 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) { 1977 // Get current loader and protection domain first. 1978 oop loader = current_class()->class_loader(); 1979 oop protection_domain = current_class()->protection_domain(); 1980 1981 Klass* kls = SystemDictionary::resolve_or_fail( 1982 name, Handle(THREAD, loader), Handle(THREAD, protection_domain), 1983 true, THREAD); 1984 1985 if (TraceClassResolution) { 1986 instanceKlassHandle cur_class = current_class(); 1987 Verifier::trace_class_resolution(kls, cur_class()); 1988 } 1989 return kls; 1990 } 1991 1992 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class, 1993 Klass* target_class, 1994 Symbol* field_name, 1995 Symbol* field_sig, 1996 bool is_method) { 1997 No_Safepoint_Verifier nosafepoint; 1998 1999 // If target class isn't a super class of this class, we don't worry about this case 2000 if (!this_class->is_subclass_of(target_class)) { 2001 return false; 2002 } 2003 // Check if the specified method or field is protected 2004 InstanceKlass* target_instance = InstanceKlass::cast(target_class); 2005 fieldDescriptor fd; 2006 if (is_method) { 2007 Method* m = target_instance->uncached_lookup_method(field_name, field_sig, Klass::find_overpass); 2008 if (m != NULL && m->is_protected()) { 2009 if (!this_class->is_same_class_package(m->method_holder())) { 2010 return true; 2011 } 2012 } 2013 } else { 2014 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd); 2015 if (member_klass != NULL && fd.is_protected()) { 2016 if (!this_class->is_same_class_package(member_klass)) { 2017 return true; 2018 } 2019 } 2020 } 2021 return false; 2022 } 2023 2024 void ClassVerifier::verify_ldc( 2025 int opcode, u2 index, StackMapFrame* current_frame, 2026 const constantPoolHandle& cp, u2 bci, TRAPS) { 2027 verify_cp_index(bci, cp, index, CHECK_VERIFY(this)); 2028 constantTag tag = cp->tag_at(index); 2029 unsigned int types; 2030 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) { 2031 if (!tag.is_unresolved_klass()) { 2032 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float) 2033 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class) 2034 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType); 2035 // Note: The class file parser already verified the legality of 2036 // MethodHandle and MethodType constants. 2037 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this)); 2038 } 2039 } else { 2040 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w"); 2041 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long); 2042 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this)); 2043 } 2044 if (tag.is_string() && cp->is_pseudo_string_at(index)) { 2045 current_frame->push_stack(object_type(), CHECK_VERIFY(this)); 2046 } else if (tag.is_string()) { 2047 current_frame->push_stack( 2048 VerificationType::reference_type( 2049 vmSymbols::java_lang_String()), CHECK_VERIFY(this)); 2050 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 2051 current_frame->push_stack( 2052 VerificationType::reference_type( 2053 vmSymbols::java_lang_Class()), CHECK_VERIFY(this)); 2054 } else if (tag.is_int()) { 2055 current_frame->push_stack( 2056 VerificationType::integer_type(), CHECK_VERIFY(this)); 2057 } else if (tag.is_float()) { 2058 current_frame->push_stack( 2059 VerificationType::float_type(), CHECK_VERIFY(this)); 2060 } else if (tag.is_double()) { 2061 current_frame->push_stack_2( 2062 VerificationType::double_type(), 2063 VerificationType::double2_type(), CHECK_VERIFY(this)); 2064 } else if (tag.is_long()) { 2065 current_frame->push_stack_2( 2066 VerificationType::long_type(), 2067 VerificationType::long2_type(), CHECK_VERIFY(this)); 2068 } else if (tag.is_method_handle()) { 2069 current_frame->push_stack( 2070 VerificationType::reference_type( 2071 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this)); 2072 } else if (tag.is_method_type()) { 2073 current_frame->push_stack( 2074 VerificationType::reference_type( 2075 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this)); 2076 } else { 2077 /* Unreachable? verify_cp_type has already validated the cp type. / 2078 verify_error( 2079 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc"); 2080 return; 2081 } 2082 } 2083 2084 void ClassVerifier::verify_switch( 2085 RawBytecodeStream bcs, u4 code_length, char* code_data, 2086 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) { 2087 int bci = bcs->bci(); 2088 address bcp = bcs->bcp(); 2089 address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize); 2090 2091 if (_klass->major_version() < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) { 2092 // 4639449 & 4647081: padding bytes must be 0 2093 u2 padding_offset = 1; 2094 while ((bcp + padding_offset) < aligned_bcp) { 2095 if((bcp + padding_offset) != 0) { 2096 verify_error(ErrorContext::bad_code(bci), 2097 "Nonzero padding byte in lookupswitch or tableswitch"); 2098 return; 2099 } 2100 padding_offset++; 2101 } 2102 } 2103 2104 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp); 2105 int keys, delta; 2106 current_frame->pop_stack( 2107 VerificationType::integer_type(), CHECK_VERIFY(this)); 2108 if (bcs->raw_code() == Bytecodes::_tableswitch) { 2109 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize); 2110 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2jintSize); 2111 if (low > high) { 2112 verify_error(ErrorContext::bad_code(bci), 2113 "low must be less than or equal to high in tableswitch"); 2114 return; 2115 } 2116 keys = high - low + 1; 2117 if (keys < 0) { 2118 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch"); 2119 return; 2120 } 2121 delta = 1; 2122 } else { 2123 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize); 2124 if (keys < 0) { 2125 verify_error(ErrorContext::bad_code(bci), 2126 "number of keys in lookupswitch less than 0"); 2127 return; 2128 } 2129 delta = 2; 2130 // Make sure that the lookupswitch items are sorted 2131 for (int i = 0; i < (keys - 1); i++) { 2132 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2i)jintSize); 2133 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2i+2)*jintSize); 2134 if (this_key >= next_key) { 2135 verify_error(ErrorContext::bad_code(bci), 2136 "Bad lookupswitch instruction"); 2137 return; 2138 } 2139 } 2140 } 2141 int target = bci + default_offset; 2142 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this)); 2143 for (int i = 0; i < keys; i++) { 2144 // Because check_jump_target() may safepoint, the bytecode could have 2145 // moved, which means 'aligned_bcp' is no good and needs to be recalculated. 2146 aligned_bcp = (address)round_to((intptr_t)(bcs->bcp() + 1), jintSize); 2147 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+idelta)jintSize); 2148 stackmap_table->check_jump_target( 2149 current_frame, target, CHECK_VERIFY(this)); 2150 } 2151 NOT_PRODUCT(aligned_bcp = NULL); // no longer valid at this point 2152 } 2153 2154 bool ClassVerifier::name_in_supers( 2155 Symbol ref_name, instanceKlassHandle current) { 2156 Klass* super = current->super(); 2157 while (super != NULL) { 2158 if (super->name() == ref_name) { 2159 return true; 2160 } 2161 super = super->super(); 2162 } 2163 return false; 2164 } 2165 2166 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs, 2167 StackMapFrame* current_frame, 2168 const constantPoolHandle& cp, 2169 bool allow_arrays, 2170 TRAPS) { 2171 u2 index = bcs->get_index_u2(); 2172 verify_cp_type(bcs->bci(), index, cp, 2173 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this)); 2174 2175 // Get field name and signature 2176 Symbol* field_name = cp->name_ref_at(index); 2177 Symbol* field_sig = cp->signature_ref_at(index); 2178 2179 if (!SignatureVerifier::is_valid_type_signature(field_sig)) { 2180 class_format_error( 2181 "Invalid signature for field in class %s referenced " 2182 "from constant pool index %d", _klass->external_name(), index); 2183 return; 2184 } 2185 2186 // Get referenced class type 2187 VerificationType ref_class_type = cp_ref_index_to_type( 2188 index, cp, CHECK_VERIFY(this)); 2189 if (!ref_class_type.is_object() && 2190 (!allow_arrays || !ref_class_type.is_array())) { 2191 verify_error(ErrorContext::bad_type(bcs->bci(), 2192 TypeOrigin::cp(index, ref_class_type)), 2193 "Expecting reference to class in class %s at constant pool index %d", 2194 _klass->external_name(), index); 2195 return; 2196 } 2197 VerificationType target_class_type = ref_class_type; 2198 2199 assert(sizeof(VerificationType) == sizeof(uintptr_t), 2200 "buffer type must match VerificationType size"); 2201 uintptr_t field_type_buffer[2]; 2202 VerificationType* field_type = (VerificationType*)field_type_buffer; 2203 // If we make a VerificationType[2] array directly, the compiler calls 2204 // to the c-runtime library to do the allocation instead of just 2205 // stack allocating it. Plus it would run constructors. This shows up 2206 // in performance profiles. 2207 2208 SignatureStream sig_stream(field_sig, false); 2209 VerificationType stack_object_type; 2210 int n = change_sig_to_verificationType( 2211 &sig_stream, field_type, CHECK_VERIFY(this)); 2212 u2 bci = bcs->bci(); 2213 bool is_assignable; 2214 switch (bcs->raw_code()) { 2215 case Bytecodes::_getstatic: { 2216 for (int i = 0; i < n; i++) { 2217 current_frame->push_stack(field_type[i], CHECK_VERIFY(this)); 2218 } 2219 break; 2220 } 2221 case Bytecodes::_putstatic: { 2222 for (int i = n - 1; i >= 0; i--) { 2223 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this)); 2224 } 2225 break; 2226 } 2227 case Bytecodes::_getfield: { 2228 stack_object_type = current_frame->pop_stack( 2229 target_class_type, CHECK_VERIFY(this)); 2230 for (int i = 0; i < n; i++) { 2231 current_frame->push_stack(field_type[i], CHECK_VERIFY(this)); 2232 } 2233 goto check_protected; 2234 } 2235 case Bytecodes::_putfield: { 2236 for (int i = n - 1; i >= 0; i--) { 2237 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this)); 2238 } 2239 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this)); 2240 2241 // The JVMS 2nd edition allows field initialization before the superclass 2242 // initializer, if the field is defined within the current class. 2243 fieldDescriptor fd; 2244 if (stack_object_type == VerificationType::uninitialized_this_type() && 2245 target_class_type.equals(current_type()) && 2246 _klass->find_local_field(field_name, field_sig, &fd)) { 2247 stack_object_type = current_type(); 2248 } 2249 is_assignable = target_class_type.is_assignable_from( 2250 stack_object_type, this, false, CHECK_VERIFY(this)); 2251 if (!is_assignable) { 2252 verify_error(ErrorContext::bad_type(bci, 2253 current_frame->stack_top_ctx(), 2254 TypeOrigin::cp(index, target_class_type)), 2255 "Bad type on operand stack in putfield"); 2256 return; 2257 } 2258 } 2259 check_protected: { 2260 if (_this_type == stack_object_type) 2261 break; // stack_object_type must be assignable to _current_class_type 2262 Symbol* ref_class_name = 2263 cp->klass_name_at(cp->klass_ref_index_at(index)); 2264 if (!name_in_supers(ref_class_name, current_class())) 2265 // stack_object_type must be assignable to _current_class_type since: 2266 // 1. stack_object_type must be assignable to ref_class. 2267 // 2. ref_class must be _current_class or a subclass of it. It can't 2268 // be a superclass of it. See revised JVMS 5.4.4. 2269 break; 2270 2271 Klass* ref_class_oop = load_class(ref_class_name, CHECK); 2272 if (is_protected_access(current_class(), ref_class_oop, field_name, 2273 field_sig, false)) { 2274 // It's protected access, check if stack object is assignable to 2275 // current class. 2276 is_assignable = current_type().is_assignable_from( 2277 stack_object_type, this, true, CHECK_VERIFY(this)); 2278 if (!is_assignable) { 2279 verify_error(ErrorContext::bad_type(bci, 2280 current_frame->stack_top_ctx(), 2281 TypeOrigin::implicit(current_type())), 2282 "Bad access to protected data in getfield"); 2283 return; 2284 } 2285 } 2286 break; 2287 } 2288 default: ShouldNotReachHere(); 2289 } 2290 } 2291 2292 // Look at the method's handlers. If the bci is in the handler's try block 2293 // then check if the handler_pc is already on the stack. If not, push it 2294 // unless the handler has already been scanned. 2295 void ClassVerifier::push_handlers(ExceptionTable* exhandlers, 2296 GrowableArray* handler_list, 2297 GrowableArray* handler_stack, 2298 u4 bci) { 2299 int exlength = exhandlers->length(); 2300 for(int x = 0; x < exlength; x++) { 2301 if (bci >= exhandlers->start_pc(x) && bci < exhandlers->end_pc(x)) { 2302 u4 exhandler_pc = exhandlers->handler_pc(x); 2303 if (!handler_list->contains(exhandler_pc)) { 2304 handler_stack->append_if_missing(exhandler_pc); 2305 handler_list->append(exhandler_pc); 2306 } 2307 } 2308 } 2309 } 2310 2311 // Return TRUE if all code paths starting with start_bc_offset end in 2312 // bytecode athrow or loop. 2313 bool ClassVerifier::ends_in_athrow(u4 start_bc_offset) { 2314 ResourceMark rm; 2315 // Create bytecode stream. 2316 RawBytecodeStream bcs(method()); 2317 u4 code_length = method()->code_size(); 2318 bcs.set_start(start_bc_offset); 2319 u4 target; 2320 // Create stack for storing bytecode start offsets for if* and switch. 2321 GrowableArray bci_stack = new GrowableArray(30); 2322 // Create stack for handlers for try blocks containing this handler. 2323 GrowableArray* handler_stack = new GrowableArray(30); 2324 // Create list of handlers that have been pushed onto the handler_stack 2325 // so that handlers embedded inside of their own TRY blocks only get 2326 // scanned once. 2327 GrowableArray* handler_list = new GrowableArray(30); 2328 // Create list of visited branch opcodes (goto* and if*). 2329 GrowableArray* visited_branches = new GrowableArray(30); 2330 ExceptionTable exhandlers(_method()); 2331 2332 while (true) { 2333 if (bcs.is_last_bytecode()) { 2334 // if no more starting offsets to parse or if at the end of the 2335 // method then return false. 2336 if ((bci_stack->is_empty()) || ((u4)bcs.end_bci() == code_length)) 2337 return false; 2338 // Pop a bytecode starting offset and scan from there. 2339 bcs.set_start(bci_stack->pop()); 2340 } 2341 Bytecodes::Code opcode = bcs.raw_next(); 2342 u4 bci = bcs.bci(); 2343 2344 // If the bytecode is in a TRY block, push its handlers so they 2345 // will get parsed. 2346 push_handlers(&exhandlers, handler_list, handler_stack, bci); 2347 2348 switch (opcode) { 2349 case Bytecodes::_if_icmpeq: 2350 case Bytecodes::_if_icmpne: 2351 case Bytecodes::_if_icmplt: 2352 case Bytecodes::_if_icmpge: 2353 case Bytecodes::_if_icmpgt: 2354 case Bytecodes::_if_icmple: 2355 case Bytecodes::_ifeq: 2356 case Bytecodes::_ifne: 2357 case Bytecodes::_iflt: 2358 case Bytecodes::_ifge: 2359 case Bytecodes::_ifgt: 2360 case Bytecodes::_ifle: 2361 case Bytecodes::_if_acmpeq: 2362 case Bytecodes::_if_acmpne: 2363 case Bytecodes::_ifnull: 2364 case Bytecodes::_ifnonnull: 2365 target = bcs.dest(); 2366 if (visited_branches->contains(bci)) { 2367 if (bci_stack->is_empty()) return true; 2368 // Pop a bytecode starting offset and scan from there. 2369 bcs.set_start(bci_stack->pop()); 2370 } else { 2371 if (target > bci) { // forward branch 2372 if (target >= code_length) return false; 2373 // Push the branch target onto the stack. 2374 bci_stack->push(target); 2375 // then, scan bytecodes starting with next. 2376 bcs.set_start(bcs.next_bci()); 2377 } else { // backward branch 2378 // Push bytecode offset following backward branch onto the stack. 2379 bci_stack->push(bcs.next_bci()); 2380 // Check bytecodes starting with branch target. 2381 bcs.set_start(target); 2382 } 2383 // Record target so we don't branch here again. 2384 visited_branches->append(bci); 2385 } 2386 break; 2387 2388 case Bytecodes::_goto: 2389 case Bytecodes::_goto_w: 2390 target = (opcode == Bytecodes::_goto ? bcs.dest() : bcs.dest_w()); 2391 if (visited_branches->contains(bci)) { 2392 if (bci_stack->is_empty()) return true; 2393 // Been here before, pop new starting offset from stack. 2394 bcs.set_start(bci_stack->pop()); 2395 } else { 2396 if (target >= code_length) return false; 2397 // Continue scanning from the target onward. 2398 bcs.set_start(target); 2399 // Record target so we don't branch here again. 2400 visited_branches->append(bci); 2401 } 2402 break; 2403 2404 // Check that all switch alternatives end in 'athrow' bytecodes. Since it 2405 // is difficult to determine where each switch alternative ends, parse 2406 // each switch alternative until either hit a 'return', 'athrow', or reach 2407 // the end of the method's bytecodes. This is gross but should be okay 2408 // because: 2409 // 1. tableswitch and lookupswitch byte codes in handlers for ctor explicit 2410 // constructor invocations should be rare. 2411 // 2. if each switch alternative ends in an athrow then the parsing should be 2412 // short. If there is no athrow then it is bogus code, anyway. 2413 case Bytecodes::_lookupswitch: 2414 case Bytecodes::_tableswitch: 2415 { 2416 address aligned_bcp = (address) round_to((intptr_t)(bcs.bcp() + 1), jintSize); 2417 u4 default_offset = Bytes::get_Java_u4(aligned_bcp) + bci; 2418 int keys, delta; 2419 if (opcode == Bytecodes::_tableswitch) { 2420 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize); 2421 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2jintSize); 2422 // This is invalid, but let the regular bytecode verifier 2423 // report this because the user will get a better error message. 2424 if (low > high) return true; 2425 keys = high - low + 1; 2426 delta = 1; 2427 } else { 2428 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize); 2429 delta = 2; 2430 } 2431 // Invalid, let the regular bytecode verifier deal with it. 2432 if (keys < 0) return true; 2433 2434 // Push the offset of the next bytecode onto the stack. 2435 bci_stack->push(bcs.next_bci()); 2436 2437 // Push the switch alternatives onto the stack. 2438 for (int i = 0; i < keys; i++) { 2439 u4 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize); 2440 if (target > code_length) return false; 2441 bci_stack->push(target); 2442 } 2443 2444 // Start bytecode parsing for the switch at the default alternative. 2445 if (default_offset > code_length) return false; 2446 bcs.set_start(default_offset); 2447 break; 2448 } 2449 2450 case Bytecodes::_return: 2451 return false; 2452 2453 case Bytecodes::_athrow: 2454 { 2455 if (bci_stack->is_empty()) { 2456 if (handler_stack->is_empty()) { 2457 return true; 2458 } else { 2459 // Parse the catch handlers for try blocks containing athrow. 2460 bcs.set_start(handler_stack->pop()); 2461 } 2462 } else { 2463 // Pop a bytecode offset and starting scanning from there. 2464 bcs.set_start(bci_stack->pop()); 2465 } 2466 } 2467 break; 2468 2469 default: 2470 ; 2471 } // end switch 2472 } // end while loop 2473 2474 return false; 2475 } 2476 2477 void ClassVerifier::verify_invoke_init( 2478 RawBytecodeStream bcs, u2 ref_class_index, VerificationType ref_class_type, 2479 StackMapFrame* current_frame, u4 code_length, bool in_try_block, 2480 bool this_uninit, const constantPoolHandle& cp, StackMapTable stackmap_table, 2481 TRAPS) { 2482 u2 bci = bcs->bci(); 2483 VerificationType type = current_frame->pop_stack( 2484 VerificationType::reference_check(), CHECK_VERIFY(this)); 2485 if (type == VerificationType::uninitialized_this_type()) { 2486 // The method must be an method of this class or its superclass 2487 Klass* superk = current_class()->super(); 2488 if (ref_class_type.name() != current_class()->name() && 2489 ref_class_type.name() != superk->name()) { 2490 verify_error(ErrorContext::bad_type(bci, 2491 TypeOrigin::implicit(ref_class_type), 2492 TypeOrigin::implicit(current_type())), 2493 "Bad method call"); 2494 return; 2495 } 2496 2497 // If this invokespecial call is done from inside of a TRY block then make 2498 // sure that all catch clause paths end in a throw. Otherwise, this can 2499 // result in returning an incomplete object. 2500 if (in_try_block) { 2501 ExceptionTable exhandlers(_method()); 2502 int exlength = exhandlers.length(); 2503 for(int i = 0; i < exlength; i++) { 2504 u2 start_pc = exhandlers.start_pc(i); 2505 u2 end_pc = exhandlers.end_pc(i); 2506 2507 if (bci >= start_pc && bci < end_pc) { 2508 if (!ends_in_athrow(exhandlers.handler_pc(i))) { 2509 verify_error(ErrorContext::bad_code(bci), 2510 "Bad method call from after the start of a try block"); 2511 return; 2512 } else if (VerboseVerification) { 2513 ResourceMark rm; 2514 tty->print_cr( 2515 "Survived call to ends_in_athrow(): %s", 2516 current_class()->name()->as_C_string()); 2517 } 2518 } 2519 } 2520 2521 // Check the exception handler target stackmaps with the locals from the 2522 // incoming stackmap (before initialize_object() changes them to outgoing 2523 // state). 2524 verify_exception_handler_targets(bci, true, current_frame, 2525 stackmap_table, CHECK_VERIFY(this)); 2526 } // in_try_block 2527 2528 current_frame->initialize_object(type, current_type()); 2529 this_uninit = true; 2530 } else if (type.is_uninitialized()) { 2531 u2 new_offset = type.bci(); 2532 address new_bcp = bcs->bcp() - bci + new_offset; 2533 if (new_offset > (code_length - 3) || (new_bcp) != Bytecodes::_new) { 2534 / Unreachable? Stack map parsing ensures valid type and new 2535 * instructions have a valid BCI. / 2536 verify_error(ErrorContext::bad_code(new_offset), 2537 "Expecting new instruction"); 2538 return; 2539 } 2540 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1); 2541 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this)); 2542 2543 // The method must be an method of the indicated class 2544 VerificationType new_class_type = cp_index_to_type( 2545 new_class_index, cp, CHECK_VERIFY(this)); 2546 if (!new_class_type.equals(ref_class_type)) { 2547 verify_error(ErrorContext::bad_type(bci, 2548 TypeOrigin::cp(new_class_index, new_class_type), 2549 TypeOrigin::cp(ref_class_index, ref_class_type)), 2550 "Call to wrong method"); 2551 return; 2552 } 2553 // According to the VM spec, if the referent class is a superclass of the 2554 // current class, and is in a different runtime package, and the method is 2555 // protected, then the objectref must be the current class or a subclass 2556 // of the current class. 2557 VerificationType objectref_type = new_class_type; 2558 if (name_in_supers(ref_class_type.name(), current_class())) { 2559 Klass ref_klass = load_class(ref_class_type.name(), CHECK); 2560 Method m = InstanceKlass::cast(ref_klass)->uncached_lookup_method( 2561 vmSymbols::object_initializer_name(), 2562 cp->signature_ref_at(bcs->get_index_u2()), 2563 Klass::find_overpass); 2564 // Do nothing if method is not found. Let resolution detect the error. 2565 if (m != NULL) { 2566 instanceKlassHandle mh(THREAD, m->method_holder()); 2567 if (m->is_protected() && !mh->is_same_class_package(_klass())) { 2568 bool assignable = current_type().is_assignable_from( 2569 objectref_type, this, true, CHECK_VERIFY(this)); 2570 if (!assignable) { 2571 verify_error(ErrorContext::bad_type(bci, 2572 TypeOrigin::cp(new_class_index, objectref_type), 2573 TypeOrigin::implicit(current_type())), 2574 "Bad access to protected method"); 2575 return; 2576 } 2577 } 2578 } 2579 } 2580 // Check the exception handler target stackmaps with the locals from the 2581 // incoming stackmap (before initialize_object() changes them to outgoing 2582 // state). 2583 if (in_try_block) { 2584 verify_exception_handler_targets(bci, this_uninit, current_frame, 2585 stackmap_table, CHECK_VERIFY(this)); 2586 } 2587 current_frame->initialize_object(type, new_class_type); 2588 } else { 2589 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()), 2590 "Bad operand type when invoking "); 2591 return; 2592 } 2593 } 2594 2595 bool ClassVerifier::is_same_or_direct_interface( 2596 instanceKlassHandle klass, 2597 VerificationType klass_type, 2598 VerificationType ref_class_type) { 2599 if (ref_class_type.equals(klass_type)) return true; 2600 Array<Klass*> local_interfaces = klass->local_interfaces(); 2601 if (local_interfaces != NULL) { 2602 for (int x = 0; x < local_interfaces->length(); x++) { 2603 Klass* k = local_interfaces->at(x); 2604 assert (k != NULL && k->is_interface(), "invalid interface"); 2605 if (ref_class_type.equals(VerificationType::reference_type(k->name()))) { 2606 return true; 2607 } 2608 } 2609 } 2610 return false; 2611 } 2612 2613 void ClassVerifier::verify_invoke_instructions( 2614 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame, 2615 bool in_try_block, bool this_uninit, VerificationType return_type, 2616 const constantPoolHandle& cp, StackMapTable stackmap_table, TRAPS) { 2617 // Make sure the constant pool item is the right type 2618 u2 index = bcs->get_index_u2(); 2619 Bytecodes::Code opcode = bcs->raw_code(); 2620 unsigned int types; 2621 switch (opcode) { 2622 case Bytecodes::_invokeinterface: 2623 types = 1 << JVM_CONSTANT_InterfaceMethodref; 2624 break; 2625 case Bytecodes::_invokedynamic: 2626 types = 1 << JVM_CONSTANT_InvokeDynamic; 2627 break; 2628 case Bytecodes::_invokespecial: 2629 case Bytecodes::_invokestatic: 2630 types = (_klass->major_version() < STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION) ? 2631 (1 << JVM_CONSTANT_Methodref) : 2632 ((1 << JVM_CONSTANT_InterfaceMethodref) | (1 << JVM_CONSTANT_Methodref)); 2633 break; 2634 default: 2635 types = 1 << JVM_CONSTANT_Methodref; 2636 } 2637 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this)); 2638 2639 // Get method name and signature 2640 Symbol* method_name = cp->name_ref_at(index); 2641 Symbol* method_sig = cp->signature_ref_at(index); 2642 2643 if (!SignatureVerifier::is_valid_method_signature(method_sig)) { 2644 class_format_error( 2645 "Invalid method signature in class %s referenced " 2646 "from constant pool index %d", _klass->external_name(), index); 2647 return; 2648 } 2649 2650 // Get referenced class type 2651 VerificationType ref_class_type; 2652 if (opcode == Bytecodes::_invokedynamic) { 2653 if (_klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 2654 class_format_error( 2655 "invokedynamic instructions not supported by this class file version (%d), class %s", 2656 _klass->major_version(), _klass->external_name()); 2657 return; 2658 } 2659 } else { 2660 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this)); 2661 } 2662 2663 // For a small signature length, we just allocate 128 bytes instead 2664 // of parsing the signature once to find its size. 2665 // -3 is for '(', ')' and return descriptor; multiply by 2 is for 2666 // longs/doubles to be consertive. 2667 assert(sizeof(VerificationType) == sizeof(uintptr_t), 2668 "buffer type must match VerificationType size"); 2669 uintptr_t on_stack_sig_types_buffer[128]; 2670 // If we make a VerificationType[128] array directly, the compiler calls 2671 // to the c-runtime library to do the allocation instead of just 2672 // stack allocating it. Plus it would run constructors. This shows up 2673 // in performance profiles. 2674 2675 VerificationType* sig_types; 2676 int size = (method_sig->utf8_length() - 3) * 2; 2677 if (size > 128) { 2678 // Long and double occupies two slots here. 2679 ArgumentSizeComputer size_it(method_sig); 2680 size = size_it.size(); 2681 sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size); 2682 } else{ 2683 sig_types = (VerificationType*)on_stack_sig_types_buffer; 2684 } 2685 SignatureStream sig_stream(method_sig); 2686 int sig_i = 0; 2687 while (!sig_stream.at_return_type()) { 2688 sig_i += change_sig_to_verificationType( 2689 &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this)); 2690 sig_stream.next(); 2691 } 2692 int nargs = sig_i; 2693 2694 #ifdef ASSERT 2695 { 2696 ArgumentSizeComputer size_it(method_sig); 2697 assert(nargs == size_it.size(), "Argument sizes do not match"); 2698 assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough"); 2699 } 2700 #endif 2701 2702 // Check instruction operands 2703 u2 bci = bcs->bci(); 2704 if (opcode == Bytecodes::_invokeinterface) { 2705 address bcp = bcs->bcp(); 2706 // 4905268: count operand in invokeinterface should be nargs+1, not nargs. 2707 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is 2708 // the difference between the size of the operand stack before and after the instruction 2709 // executes. 2710 if ((bcp+3) != (nargs+1)) { 2711 verify_error(ErrorContext::bad_code(bci), 2712 "Inconsistent args count operand in invokeinterface"); 2713 return; 2714 } 2715 if ((bcp+4) != 0) { 2716 verify_error(ErrorContext::bad_code(bci), 2717 "Fourth operand byte of invokeinterface must be zero"); 2718 return; 2719 } 2720 } 2721 2722 if (opcode == Bytecodes::_invokedynamic) { 2723 address bcp = bcs->bcp(); 2724 if ((bcp+3) != 0 || (bcp+4) != 0) { 2725 verify_error(ErrorContext::bad_code(bci), 2726 "Third and fourth operand bytes of invokedynamic must be zero"); 2727 return; 2728 } 2729 } 2730 2731 if (method_name->byte_at(0) == '<') { 2732 // Make sure can only be invoked by invokespecial 2733 if (opcode != Bytecodes::_invokespecial || 2734 method_name != vmSymbols::object_initializer_name()) { 2735 verify_error(ErrorContext::bad_code(bci), 2736 "Illegal call to internal method"); 2737 return; 2738 } 2739 } else if (opcode == Bytecodes::_invokespecial 2740 && !is_same_or_direct_interface(current_class(), current_type(), ref_class_type) 2741 && !ref_class_type.equals(VerificationType::reference_type( 2742 current_class()->super()->name()))) { 2743 bool subtype = false; 2744 bool have_imr_indirect = cp->tag_at(index).value() == JVM_CONSTANT_InterfaceMethodref; 2745 if (!current_class()->is_anonymous()) { 2746 subtype = ref_class_type.is_assignable_from( 2747 current_type(), this, false, CHECK_VERIFY(this)); 2748 } else { 2749 VerificationType host_klass_type = 2750 VerificationType::reference_type(current_class()->host_klass()->name()); 2751 subtype = ref_class_type.is_assignable_from(host_klass_type, this, false, CHECK_VERIFY(this)); 2752 2753 // If invokespecial of IMR, need to recheck for same or 2754 // direct interface relative to the host class 2755 have_imr_indirect = (have_imr_indirect && 2756 !is_same_or_direct_interface( 2757 InstanceKlass::cast(current_class()->host_klass()), 2758 host_klass_type, ref_class_type)); 2759 } 2760 if (!subtype) { 2761 verify_error(ErrorContext::bad_code(bci), 2762 "Bad invokespecial instruction: " 2763 "current class isn't assignable to reference class."); 2764 return; 2765 } else if (have_imr_indirect) { 2766 verify_error(ErrorContext::bad_code(bci), 2767 "Bad invokespecial instruction: " 2768 "interface method reference is in an indirect superinterface."); 2769 return; 2770 } 2771 2772 } 2773 // Match method descriptor with operand stack 2774 for (int i = nargs - 1; i >= 0; i--) { // Run backwards 2775 current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this)); 2776 } 2777 // Check objectref on operand stack 2778 if (opcode != Bytecodes::_invokestatic && 2779 opcode != Bytecodes::_invokedynamic) { 2780 if (method_name == vmSymbols::object_initializer_name()) { // method 2781 verify_invoke_init(bcs, index, ref_class_type, current_frame, 2782 code_length, in_try_block, this_uninit, cp, stackmap_table, 2783 CHECK_VERIFY(this)); 2784 } else { // other methods 2785 // Ensures that target class is assignable to method class. 2786 if (opcode == Bytecodes::_invokespecial) { 2787 if (!current_class()->is_anonymous()) { 2788 current_frame->pop_stack(current_type(), CHECK_VERIFY(this)); 2789 } else { 2790 // anonymous class invokespecial calls: check if the 2791 // objectref is a subtype of the host_klass of the current class 2792 // to allow an anonymous class to reference methods in the host_klass 2793 VerificationType top = current_frame->pop_stack(CHECK_VERIFY(this)); 2794 VerificationType hosttype = 2795 VerificationType::reference_type(current_class()->host_klass()->name()); 2796 bool subtype = hosttype.is_assignable_from(top, this, false, CHECK_VERIFY(this)); 2797 if (!subtype) { 2798 verify_error( ErrorContext::bad_type(current_frame->offset(), 2799 current_frame->stack_top_ctx(), 2800 TypeOrigin::implicit(top)), 2801 "Bad type on operand stack"); 2802 return; 2803 } 2804 } 2805 } else if (opcode == Bytecodes::_invokevirtual) { 2806 VerificationType stack_object_type = 2807 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this)); 2808 if (current_type() != stack_object_type) { 2809 assert(cp->cache() == NULL, "not rewritten yet"); 2810 Symbol ref_class_name = 2811 cp->klass_name_at(cp->klass_ref_index_at(index)); 2812 // See the comments in verify_field_instructions() for 2813 // the rationale behind this. 2814 if (name_in_supers(ref_class_name, current_class())) { 2815 Klass ref_class = load_class(ref_class_name, CHECK); 2816 if (is_protected_access( 2817 _klass, ref_class, method_name, method_sig, true)) { 2818 // It's protected access, check if stack object is 2819 // assignable to current class. 2820 bool is_assignable = current_type().is_assignable_from( 2821 stack_object_type, this, true, CHECK_VERIFY(this)); 2822 if (!is_assignable) { 2823 if (ref_class_type.name() == vmSymbols::java_lang_Object() 2824 && stack_object_type.is_array() 2825 && method_name == vmSymbols::clone_name()) { 2826 // Special case: arrays pretend to implement public Object 2827 // clone(). 2828 } else { 2829 verify_error(ErrorContext::bad_type(bci, 2830 current_frame->stack_top_ctx(), 2831 TypeOrigin::implicit(current_type())), 2832 "Bad access to protected data in invokevirtual"); 2833 return; 2834 } 2835 } 2836 } 2837 } 2838 } 2839 } else { 2840 assert(opcode == Bytecodes::invokeinterface, "Unexpected opcode encountered"); 2841 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this)); 2842 } 2843 } 2844 } 2845 // Push the result type. 2846 if (sig_stream.type() != T_VOID) { 2847 if (method_name == vmSymbols::object_initializer_name()) { 2848 // method must have a void return type 2849 /* Unreachable? Class file parser verifies that methods with '<' have 2850 * void return / 2851 verify_error(ErrorContext::bad_code(bci), 2852 "Return type must be void in method"); 2853 return; 2854 } 2855 VerificationType return_type[2]; 2856 int n = change_sig_to_verificationType( 2857 &sig_stream, return_type, CHECK_VERIFY(this)); 2858 for (int i = 0; i < n; i++) { 2859 current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards 2860 } 2861 } 2862 } 2863 2864 VerificationType ClassVerifier::get_newarray_type( 2865 u2 index, u2 bci, TRAPS) { 2866 const char from_bt[] = { 2867 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J", 2868 }; 2869 if (index < T_BOOLEAN || index > T_LONG) { 2870 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction"); 2871 return VerificationType::bogus_type(); 2872 } 2873 2874 // from_bt[index] contains the array signature which has a length of 2 2875 Symbol* sig = create_temporary_symbol( 2876 from_bt[index], 2, CHECK(VerificationType::bogus_type())); 2877 return VerificationType::reference_type(sig); 2878 } 2879 2880 void ClassVerifier::verify_anewarray( 2881 u2 bci, u2 index, const constantPoolHandle& cp, 2882 StackMapFrame* current_frame, TRAPS) { 2883 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this)); 2884 current_frame->pop_stack( 2885 VerificationType::integer_type(), CHECK_VERIFY(this)); 2886 2887 VerificationType component_type = 2888 cp_index_to_type(index, cp, CHECK_VERIFY(this)); 2889 int length; 2890 char* arr_sig_str; 2891 if (component_type.is_array()) { // it's an array 2892 const char* component_name = component_type.name()->as_utf8(); 2893 // add one dimension to component 2894 length = (int)strlen(component_name) + 1; 2895 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length); 2896 arr_sig_str[0] = '['; 2897 strncpy(&arr_sig_str[1], component_name, length - 1); 2898 } else { // it's an object or interface 2899 const char* component_name = component_type.name()->as_utf8(); 2900 // add one dimension to component with 'L' prepended and ';' postpended. 2901 length = (int)strlen(component_name) + 3; 2902 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length); 2903 arr_sig_str[0] = '['; 2904 arr_sig_str[1] = 'L'; 2905 strncpy(&arr_sig_str[2], component_name, length - 2); 2906 arr_sig_str[length - 1] = ';'; 2907 } 2908 Symbol* arr_sig = create_temporary_symbol( 2909 arr_sig_str, length, CHECK_VERIFY(this)); 2910 VerificationType new_array_type = VerificationType::reference_type(arr_sig); 2911 current_frame->push_stack(new_array_type, CHECK_VERIFY(this)); 2912 } 2913 2914 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) { 2915 current_frame->get_local( 2916 index, VerificationType::integer_type(), CHECK_VERIFY(this)); 2917 current_frame->push_stack( 2918 VerificationType::integer_type(), CHECK_VERIFY(this)); 2919 } 2920 2921 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) { 2922 current_frame->get_local_2( 2923 index, VerificationType::long_type(), 2924 VerificationType::long2_type(), CHECK_VERIFY(this)); 2925 current_frame->push_stack_2( 2926 VerificationType::long_type(), 2927 VerificationType::long2_type(), CHECK_VERIFY(this)); 2928 } 2929 2930 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) { 2931 current_frame->get_local( 2932 index, VerificationType::float_type(), CHECK_VERIFY(this)); 2933 current_frame->push_stack( 2934 VerificationType::float_type(), CHECK_VERIFY(this)); 2935 } 2936 2937 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) { 2938 current_frame->get_local_2( 2939 index, VerificationType::double_type(), 2940 VerificationType::double2_type(), CHECK_VERIFY(this)); 2941 current_frame->push_stack_2( 2942 VerificationType::double_type(), 2943 VerificationType::double2_type(), CHECK_VERIFY(this)); 2944 } 2945 2946 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) { 2947 VerificationType type = current_frame->get_local( 2948 index, VerificationType::reference_check(), CHECK_VERIFY(this)); 2949 current_frame->push_stack(type, CHECK_VERIFY(this)); 2950 } 2951 2952 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) { 2953 current_frame->pop_stack( 2954 VerificationType::integer_type(), CHECK_VERIFY(this)); 2955 current_frame->set_local( 2956 index, VerificationType::integer_type(), CHECK_VERIFY(this)); 2957 } 2958 2959 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) { 2960 current_frame->pop_stack_2( 2961 VerificationType::long2_type(), 2962 VerificationType::long_type(), CHECK_VERIFY(this)); 2963 current_frame->set_local_2( 2964 index, VerificationType::long_type(), 2965 VerificationType::long2_type(), CHECK_VERIFY(this)); 2966 } 2967 2968 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) { 2969 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this)); 2970 current_frame->set_local( 2971 index, VerificationType::float_type(), CHECK_VERIFY(this)); 2972 } 2973 2974 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) { 2975 current_frame->pop_stack_2( 2976 VerificationType::double2_type(), 2977 VerificationType::double_type(), CHECK_VERIFY(this)); 2978 current_frame->set_local_2( 2979 index, VerificationType::double_type(), 2980 VerificationType::double2_type(), CHECK_VERIFY(this)); 2981 } 2982 2983 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) { 2984 VerificationType type = current_frame->pop_stack( 2985 VerificationType::reference_check(), CHECK_VERIFY(this)); 2986 current_frame->set_local(index, type, CHECK_VERIFY(this)); 2987 } 2988 2989 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) { 2990 VerificationType type = current_frame->get_local( 2991 index, VerificationType::integer_type(), CHECK_VERIFY(this)); 2992 current_frame->set_local(index, type, CHECK_VERIFY(this)); 2993 } 2994 2995 void ClassVerifier::verify_return_value( 2996 VerificationType return_type, VerificationType type, u2 bci, 2997 StackMapFrame* current_frame, TRAPS) { 2998 if (return_type == VerificationType::bogus_type()) { 2999 verify_error(ErrorContext::bad_type(bci, 3000 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)), 3001 "Method expects a return value"); 3002 return; 3003 } 3004 bool match = return_type.is_assignable_from(type, this, false, CHECK_VERIFY(this)); 3005 if (!match) { 3006 verify_error(ErrorContext::bad_type(bci, 3007 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)), 3008 "Bad return type"); 3009 return; 3010 } 3011 } 3012 3013 // The verifier creates symbols which are substrings of Symbols. 3014 // These are stored in the verifier until the end of verification so that 3015 // they can be reference counted. 3016 Symbol* ClassVerifier::create_temporary_symbol(const Symbol s, int begin, 3017 int end, TRAPS) { 3018 Symbol sym = SymbolTable::new_symbol(s, begin, end, CHECK_NULL); 3019 _symbols->push(sym); 3020 return sym; 3021 } 3022 3023 Symbol* ClassVerifier::create_temporary_symbol(const char s, int length, TRAPS) { 3024 Symbol sym = SymbolTable::new_symbol(s, length, CHECK_NULL); 3025 _symbols->push(sym); 3026 return sym; 3027 }