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