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