1 /* 2 * Copyright (c) 1998, 2016, 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/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "compiler/compileBroker.hpp" 29 #include "logging/log.hpp" 30 #include "oops/oop.inline.hpp" 31 #include "runtime/init.hpp" 32 #include "runtime/java.hpp" 33 #include "runtime/javaCalls.hpp" 34 #include "runtime/thread.inline.hpp" 35 #include "runtime/threadCritical.hpp" 36 #include "utilities/events.hpp" 37 #include "utilities/exceptions.hpp" 38 39 // Implementation of ThreadShadow 40 void check_ThreadShadow() { 41 const ByteSize offset1 = byte_offset_of(ThreadShadow, _pending_exception); 42 const ByteSize offset2 = Thread::pending_exception_offset(); 43 if (offset1 != offset2) fatal("ThreadShadow::_pending_exception is not positioned correctly"); 44 } 45 46 47 void ThreadShadow::set_pending_exception(oop exception, const char* file, int line) { 48 assert(exception != NULL && exception->is_oop(), "invalid exception oop"); 49 _pending_exception = exception; 50 _exception_file = file; 51 _exception_line = line; 52 } 53 54 void ThreadShadow::clear_pending_exception() { 55 if (TraceClearedExceptions) { 56 if (_pending_exception != NULL) { 57 tty->print_cr("Thread::clear_pending_exception: cleared exception:"); 58 _pending_exception->print(); 59 } 60 } 61 _pending_exception = NULL; 62 _exception_file = NULL; 63 _exception_line = 0; 64 } 65 // Implementation of Exceptions 66 67 bool Exceptions::special_exception(Thread* thread, const char* file, int line, Handle h_exception) { 68 // bootstrapping check 69 if (!Universe::is_fully_initialized()) { 70 vm_exit_during_initialization(h_exception); 71 ShouldNotReachHere(); 72 } 73 74 #ifdef ASSERT 75 // Check for trying to throw stack overflow before initialization is complete 76 // to prevent infinite recursion trying to initialize stack overflow without 77 // adequate stack space. 78 // This can happen with stress testing a large value of StackShadowPages 79 if (h_exception()->klass() == SystemDictionary::StackOverflowError_klass()) { 80 InstanceKlass* ik = InstanceKlass::cast(h_exception->klass()); 81 assert(ik->is_initialized(), 82 "need to increase min_stack_allowed calculation"); 83 } 84 #endif // ASSERT 85 86 if (thread->is_VM_thread() 87 || !thread->can_call_java() 88 || DumpSharedSpaces ) { 89 // We do not care what kind of exception we get for the vm-thread or a thread which 90 // is compiling. We just install a dummy exception object 91 // 92 // We also cannot throw a proper exception when dumping, because we cannot run 93 // Java bytecodes now. A dummy exception will suffice. 94 thread->set_pending_exception(Universe::vm_exception(), file, line); 95 return true; 96 } 97 98 return false; 99 } 100 101 bool Exceptions::special_exception(Thread* thread, const char* file, int line, Symbol* h_name, const char* message) { 102 // bootstrapping check 103 if (!Universe::is_fully_initialized()) { 104 if (h_name == NULL) { 105 // atleast an informative message. 106 vm_exit_during_initialization("Exception", message); 107 } else { 108 vm_exit_during_initialization(h_name, message); 109 } 110 ShouldNotReachHere(); 111 } 112 113 if (thread->is_VM_thread() 114 || !thread->can_call_java() 115 || DumpSharedSpaces ) { 116 // We do not care what kind of exception we get for the vm-thread or a thread which 117 // is compiling. We just install a dummy exception object 118 // 119 // We also cannot throw a proper exception when dumping, because we cannot run 120 // Java bytecodes now. A dummy exception will suffice. 121 thread->set_pending_exception(Universe::vm_exception(), file, line); 122 return true; 123 } 124 return false; 125 } 126 127 // This method should only be called from generated code, 128 // therefore the exception oop should be in the oopmap. 129 void Exceptions::_throw_oop(Thread* thread, const char* file, int line, oop exception) { 130 assert(exception != NULL, "exception should not be NULL"); 131 Handle h_exception = Handle(thread, exception); 132 _throw(thread, file, line, h_exception); 133 } 134 135 void Exceptions::_throw(Thread* thread, const char* file, int line, Handle h_exception, const char* message) { 136 ResourceMark rm; 137 assert(h_exception() != NULL, "exception should not be NULL"); 138 139 // tracing (do this up front - so it works during boot strapping) 140 log_info(exceptions)("Exception <%s%s%s> (" INTPTR_FORMAT ") \n" 141 "thrown [%s, line %d]\nfor thread " INTPTR_FORMAT, 142 h_exception->print_value_string(), 143 message ? ": " : "", message ? message : "", 144 p2i(h_exception()), file, line, p2i(thread)); 145 // for AbortVMOnException flag 146 Exceptions::debug_check_abort(h_exception, message); 147 148 // Check for special boot-strapping/vm-thread handling 149 if (special_exception(thread, file, line, h_exception)) { 150 return; 151 } 152 153 if (h_exception->is_a(SystemDictionary::OutOfMemoryError_klass())) { 154 count_out_of_memory_exceptions(h_exception); 155 } 156 157 assert(h_exception->is_a(SystemDictionary::Throwable_klass()), "exception is not a subclass of java/lang/Throwable"); 158 159 // set the pending exception 160 thread->set_pending_exception(h_exception(), file, line); 161 162 // vm log 163 if (LogEvents){ 164 Events::log_exception(thread, "Exception <%s%s%s> (" INTPTR_FORMAT ") thrown at [%s, line %d]", 165 h_exception->print_value_string(), message ? ": " : "", message ? message : "", 166 p2i(h_exception()), file, line); 167 } 168 } 169 170 171 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message, 172 Handle h_loader, Handle h_protection_domain) { 173 // Check for special boot-strapping/vm-thread handling 174 if (special_exception(thread, file, line, name, message)) return; 175 // Create and throw exception 176 Handle h_cause(thread, NULL); 177 Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain); 178 _throw(thread, file, line, h_exception, message); 179 } 180 181 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause, 182 Handle h_loader, Handle h_protection_domain) { 183 // Check for special boot-strapping/vm-thread handling 184 if (special_exception(thread, file, line, name, message)) return; 185 // Create and throw exception and init cause 186 Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain); 187 _throw(thread, file, line, h_exception, message); 188 } 189 190 void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause, 191 Handle h_loader, Handle h_protection_domain) { 192 // Check for special boot-strapping/vm-thread handling 193 if (special_exception(thread, file, line, h_cause)) return; 194 // Create and throw exception 195 Handle h_exception = new_exception(thread, name, h_cause, h_loader, h_protection_domain); 196 _throw(thread, file, line, h_exception, NULL); 197 } 198 199 void Exceptions::_throw_args(Thread* thread, const char* file, int line, Symbol* name, Symbol* signature, JavaCallArguments *args) { 200 // Check for special boot-strapping/vm-thread handling 201 if (special_exception(thread, file, line, name, NULL)) return; 202 // Create and throw exception 203 Handle h_loader(thread, NULL); 204 Handle h_prot(thread, NULL); 205 Handle exception = new_exception(thread, name, signature, args, h_loader, h_prot); 206 _throw(thread, file, line, exception); 207 } 208 209 210 // Methods for default parameters. 211 // NOTE: These must be here (and not in the header file) because of include circularities. 212 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause) { 213 _throw_msg_cause(thread, file, line, name, message, h_cause, Handle(thread, NULL), Handle(thread, NULL)); 214 } 215 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message) { 216 _throw_msg(thread, file, line, name, message, Handle(thread, NULL), Handle(thread, NULL)); 217 } 218 void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause) { 219 _throw_cause(thread, file, line, name, h_cause, Handle(thread, NULL), Handle(thread, NULL)); 220 } 221 222 223 void Exceptions::throw_stack_overflow_exception(Thread* THREAD, const char* file, int line, const methodHandle& method) { 224 Handle exception; 225 if (!THREAD->has_pending_exception()) { 226 Klass* k = SystemDictionary::StackOverflowError_klass(); 227 oop e = InstanceKlass::cast(k)->allocate_instance(CHECK); 228 exception = Handle(THREAD, e); // fill_in_stack trace does gc 229 assert(InstanceKlass::cast(k)->is_initialized(), "need to increase min_stack_allowed calculation"); 230 if (StackTraceInThrowable) { 231 java_lang_Throwable::fill_in_stack_trace(exception, method()); 232 } 233 // Increment counter for hs_err file reporting 234 Atomic::inc(&Exceptions::_stack_overflow_errors); 235 } else { 236 // if prior exception, throw that one instead 237 exception = Handle(THREAD, THREAD->pending_exception()); 238 } 239 _throw(THREAD, file, line, exception); 240 } 241 242 void Exceptions::fthrow(Thread* thread, const char* file, int line, Symbol* h_name, const char* format, ...) { 243 const int max_msg_size = 1024; 244 va_list ap; 245 va_start(ap, format); 246 char msg[max_msg_size]; 247 vsnprintf(msg, max_msg_size, format, ap); 248 msg[max_msg_size-1] = '\0'; 249 va_end(ap); 250 _throw_msg(thread, file, line, h_name, msg); 251 } 252 253 254 // Creates an exception oop, calls the <init> method with the given signature. 255 // and returns a Handle 256 Handle Exceptions::new_exception(Thread *thread, Symbol* name, 257 Symbol* signature, JavaCallArguments *args, 258 Handle h_loader, Handle h_protection_domain) { 259 assert(Universe::is_fully_initialized(), 260 "cannot be called during initialization"); 261 assert(thread->is_Java_thread(), "can only be called by a Java thread"); 262 assert(!thread->has_pending_exception(), "already has exception"); 263 264 Handle h_exception; 265 266 // Resolve exception klass 267 Klass* ik = SystemDictionary::resolve_or_fail(name, h_loader, h_protection_domain, true, thread); 268 instanceKlassHandle klass(thread, ik); 269 270 if (!thread->has_pending_exception()) { 271 assert(klass.not_null(), "klass must exist"); 272 // We are about to create an instance - so make sure that klass is initialized 273 klass->initialize(thread); 274 if (!thread->has_pending_exception()) { 275 // Allocate new exception 276 h_exception = klass->allocate_instance_handle(thread); 277 if (!thread->has_pending_exception()) { 278 JavaValue result(T_VOID); 279 args->set_receiver(h_exception); 280 // Call constructor 281 JavaCalls::call_special(&result, klass, 282 vmSymbols::object_initializer_name(), 283 signature, 284 args, 285 thread); 286 } 287 } 288 } 289 290 // Check if another exception was thrown in the process, if so rethrow that one 291 if (thread->has_pending_exception()) { 292 h_exception = Handle(thread, thread->pending_exception()); 293 thread->clear_pending_exception(); 294 } 295 return h_exception; 296 } 297 298 // Creates an exception oop, calls the <init> method with the given signature. 299 // and returns a Handle 300 // Initializes the cause if cause non-null 301 Handle Exceptions::new_exception(Thread *thread, Symbol* name, 302 Symbol* signature, JavaCallArguments *args, 303 Handle h_cause, 304 Handle h_loader, Handle h_protection_domain) { 305 Handle h_exception = new_exception(thread, name, signature, args, h_loader, h_protection_domain); 306 307 // Future: object initializer should take a cause argument 308 if (h_cause.not_null()) { 309 assert(h_cause->is_a(SystemDictionary::Throwable_klass()), 310 "exception cause is not a subclass of java/lang/Throwable"); 311 JavaValue result1(T_OBJECT); 312 JavaCallArguments args1; 313 args1.set_receiver(h_exception); 314 args1.push_oop(h_cause); 315 JavaCalls::call_virtual(&result1, h_exception->klass(), 316 vmSymbols::initCause_name(), 317 vmSymbols::throwable_throwable_signature(), 318 &args1, 319 thread); 320 } 321 322 // Check if another exception was thrown in the process, if so rethrow that one 323 if (thread->has_pending_exception()) { 324 h_exception = Handle(thread, thread->pending_exception()); 325 thread->clear_pending_exception(); 326 } 327 return h_exception; 328 } 329 330 // Convenience method. Calls either the <init>() or <init>(Throwable) method when 331 // creating a new exception 332 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 333 Handle h_cause, 334 Handle h_loader, Handle h_protection_domain, 335 ExceptionMsgToUtf8Mode to_utf8_safe) { 336 JavaCallArguments args; 337 Symbol* signature = NULL; 338 if (h_cause.is_null()) { 339 signature = vmSymbols::void_method_signature(); 340 } else { 341 signature = vmSymbols::throwable_void_signature(); 342 args.push_oop(h_cause); 343 } 344 return new_exception(thread, name, signature, &args, h_loader, h_protection_domain); 345 } 346 347 // Convenience method. Calls either the <init>() or <init>(String) method when 348 // creating a new exception 349 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 350 const char* message, Handle h_cause, 351 Handle h_loader, Handle h_protection_domain, 352 ExceptionMsgToUtf8Mode to_utf8_safe) { 353 JavaCallArguments args; 354 Symbol* signature = NULL; 355 if (message == NULL) { 356 signature = vmSymbols::void_method_signature(); 357 } else { 358 // We want to allocate storage, but we can't do that if there's 359 // a pending exception, so we preserve any pending exception 360 // around the allocation. 361 // If we get an exception from the allocation, prefer that to 362 // the exception we are trying to build, or the pending exception. 363 // This is sort of like what PRESERVE_EXCEPTION_MARK does, except 364 // for the preferencing and the early returns. 365 Handle incoming_exception(thread, NULL); 366 if (thread->has_pending_exception()) { 367 incoming_exception = Handle(thread, thread->pending_exception()); 368 thread->clear_pending_exception(); 369 } 370 Handle msg; 371 if (to_utf8_safe == safe_to_utf8) { 372 // Make a java UTF8 string. 373 msg = java_lang_String::create_from_str(message, thread); 374 } else { 375 // Make a java string keeping the encoding scheme of the original string. 376 msg = java_lang_String::create_from_platform_dependent_str(message, thread); 377 } 378 if (thread->has_pending_exception()) { 379 Handle exception(thread, thread->pending_exception()); 380 thread->clear_pending_exception(); 381 return exception; 382 } 383 if (incoming_exception.not_null()) { 384 return incoming_exception; 385 } 386 args.push_oop(msg); 387 signature = vmSymbols::string_void_signature(); 388 } 389 return new_exception(thread, name, signature, &args, h_cause, h_loader, h_protection_domain); 390 } 391 392 // Another convenience method that creates handles for null class loaders and 393 // protection domains and null causes. 394 // If the last parameter 'to_utf8_mode' is safe_to_utf8, 395 // it means we can safely ignore the encoding scheme of the message string and 396 // convert it directly to a java UTF8 string. Otherwise, we need to take the 397 // encoding scheme of the string into account. One thing we should do at some 398 // point is to push this flag down to class java_lang_String since other 399 // classes may need similar functionalities. 400 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 401 const char* message, 402 ExceptionMsgToUtf8Mode to_utf8_safe) { 403 404 Handle h_loader(thread, NULL); 405 Handle h_prot(thread, NULL); 406 Handle h_cause(thread, NULL); 407 return Exceptions::new_exception(thread, name, message, h_cause, h_loader, 408 h_prot, to_utf8_safe); 409 } 410 411 412 // Exception counting for hs_err file 413 volatile int Exceptions::_stack_overflow_errors = 0; 414 volatile int Exceptions::_out_of_memory_error_java_heap_errors = 0; 415 volatile int Exceptions::_out_of_memory_error_metaspace_errors = 0; 416 volatile int Exceptions::_out_of_memory_error_class_metaspace_errors = 0; 417 418 void Exceptions::count_out_of_memory_exceptions(Handle exception) { 419 if (exception() == Universe::out_of_memory_error_metaspace()) { 420 Atomic::inc(&_out_of_memory_error_metaspace_errors); 421 } else if (exception() == Universe::out_of_memory_error_class_metaspace()) { 422 Atomic::inc(&_out_of_memory_error_class_metaspace_errors); 423 } else { 424 // everything else reported as java heap OOM 425 Atomic::inc(&_out_of_memory_error_java_heap_errors); 426 } 427 } 428 429 void print_oom_count(outputStream* st, const char *err, int count) { 430 if (count > 0) { 431 st->print_cr("OutOfMemoryError %s=%d", err, count); 432 } 433 } 434 435 bool Exceptions::has_exception_counts() { 436 return (_stack_overflow_errors + _out_of_memory_error_java_heap_errors + 437 _out_of_memory_error_metaspace_errors + _out_of_memory_error_class_metaspace_errors) > 0; 438 } 439 440 void Exceptions::print_exception_counts_on_error(outputStream* st) { 441 print_oom_count(st, "java_heap_errors", _out_of_memory_error_java_heap_errors); 442 print_oom_count(st, "metaspace_errors", _out_of_memory_error_metaspace_errors); 443 print_oom_count(st, "class_metaspace_errors", _out_of_memory_error_class_metaspace_errors); 444 if (_stack_overflow_errors > 0) { 445 st->print_cr("StackOverflowErrors=%d", _stack_overflow_errors); 446 } 447 } 448 449 // Implementation of ExceptionMark 450 451 ExceptionMark::ExceptionMark(Thread*& thread) { 452 thread = Thread::current(); 453 _thread = thread; 454 if (_thread->has_pending_exception()) { 455 oop exception = _thread->pending_exception(); 456 _thread->clear_pending_exception(); // Needed to avoid infinite recursion 457 exception->print(); 458 fatal("ExceptionMark constructor expects no pending exceptions"); 459 } 460 } 461 462 463 ExceptionMark::~ExceptionMark() { 464 if (_thread->has_pending_exception()) { 465 Handle exception(_thread, _thread->pending_exception()); 466 _thread->clear_pending_exception(); // Needed to avoid infinite recursion 467 if (is_init_completed()) { 468 exception->print(); 469 fatal("ExceptionMark destructor expects no pending exceptions"); 470 } else { 471 vm_exit_during_initialization(exception); 472 } 473 } 474 } 475 476 // ---------------------------------------------------------------------------------------- 477 478 // caller frees value_string if necessary 479 void Exceptions::debug_check_abort(const char *value_string, const char* message) { 480 if (AbortVMOnException != NULL && value_string != NULL && 481 strstr(value_string, AbortVMOnException)) { 482 if (AbortVMOnExceptionMessage == NULL || (message != NULL && 483 strstr(message, AbortVMOnExceptionMessage))) { 484 fatal("Saw %s, aborting", value_string); 485 } 486 } 487 } 488 489 void Exceptions::debug_check_abort(Handle exception, const char* message) { 490 if (AbortVMOnException != NULL) { 491 debug_check_abort_helper(exception, message); 492 } 493 } 494 495 void Exceptions::debug_check_abort_helper(Handle exception, const char* message) { 496 ResourceMark rm; 497 if (message == NULL && exception->is_a(SystemDictionary::Throwable_klass())) { 498 oop msg = java_lang_Throwable::message(exception); 499 if (msg != NULL) { 500 message = java_lang_String::as_utf8_string(msg); 501 } 502 } 503 debug_check_abort(exception()->klass()->external_name(), message); 504 } 505 506 // for logging exceptions 507 void Exceptions::log_exception(Handle exception, stringStream tempst) { 508 ResourceMark rm; 509 Symbol* message = java_lang_Throwable::detail_message(exception()); 510 if (message != NULL) { 511 log_info(exceptions)("Exception <%s: %s> (" INTPTR_FORMAT ")\n thrown in %s", 512 exception->print_value_string(), 513 message->as_C_string(), p2i(exception()), tempst.as_string()); 514 } else { 515 log_info(exceptions)("Exception <%s> (" INTPTR_FORMAT ")\n thrown in %s", 516 exception->print_value_string(), 517 p2i(exception()), tempst.as_string()); 518 } 519 }