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 "memory/resourceArea.hpp" 31 #include "oops/oop.inline.hpp" 32 #include "runtime/init.hpp" 33 #include "runtime/java.hpp" 34 #include "runtime/javaCalls.hpp" 35 #include "runtime/thread.inline.hpp" 36 #include "runtime/threadCritical.hpp" 37 #include "utilities/events.hpp" 38 #include "utilities/exceptions.hpp" 39 40 // Implementation of ThreadShadow 41 void check_ThreadShadow() { 42 const ByteSize offset1 = byte_offset_of(ThreadShadow, _pending_exception); 43 const ByteSize offset2 = Thread::pending_exception_offset(); 44 if (offset1 != offset2) fatal("ThreadShadow::_pending_exception is not positioned correctly"); 45 } 46 47 48 void ThreadShadow::set_pending_exception(oop exception, const char* file, int line) { 49 assert(exception != NULL && exception->is_oop(), "invalid exception oop"); 50 _pending_exception = exception; 51 _exception_file = file; 52 _exception_line = line; 53 } 54 55 void ThreadShadow::clear_pending_exception() { 56 if (_pending_exception != NULL && log_is_enabled(Debug, exceptions)) { 57 ResourceMark rm; 58 outputStream* logst = Log(exceptions)::debug_stream(); 59 logst->print("Thread::clear_pending_exception: cleared exception:"); 60 _pending_exception->print_on(logst); 61 } 62 _pending_exception = NULL; 63 _exception_file = NULL; 64 _exception_line = 0; 65 } 66 // Implementation of Exceptions 67 68 bool Exceptions::special_exception(Thread* thread, const char* file, int line, Handle h_exception) { 69 // bootstrapping check 70 if (!Universe::is_fully_initialized()) { 71 vm_exit_during_initialization(h_exception); 72 ShouldNotReachHere(); 73 } 74 75 #ifdef ASSERT 76 // Check for trying to throw stack overflow before initialization is complete 77 // to prevent infinite recursion trying to initialize stack overflow without 78 // adequate stack space. 79 // This can happen with stress testing a large value of StackShadowPages 80 if (h_exception()->klass() == SystemDictionary::StackOverflowError_klass()) { 81 InstanceKlass* ik = InstanceKlass::cast(h_exception->klass()); 82 assert(ik->is_initialized(), 83 "need to increase min_stack_allowed calculation"); 84 } 85 #endif // ASSERT 86 87 if (thread->is_VM_thread() 88 || !thread->can_call_java() 89 || DumpSharedSpaces ) { 90 // We do not care what kind of exception we get for the vm-thread or a thread which 91 // is compiling. We just install a dummy exception object 92 // 93 // We also cannot throw a proper exception when dumping, because we cannot run 94 // Java bytecodes now. A dummy exception will suffice. 95 thread->set_pending_exception(Universe::vm_exception(), file, line); 96 return true; 97 } 98 99 return false; 100 } 101 102 bool Exceptions::special_exception(Thread* thread, const char* file, int line, Symbol* h_name, const char* message) { 103 // bootstrapping check 104 if (!Universe::is_fully_initialized()) { 105 if (h_name == NULL) { 106 // atleast an informative message. 107 vm_exit_during_initialization("Exception", message); 108 } else { 109 vm_exit_during_initialization(h_name, message); 110 } 111 ShouldNotReachHere(); 112 } 113 114 if (thread->is_VM_thread() 115 || !thread->can_call_java() 116 || DumpSharedSpaces ) { 117 // We do not care what kind of exception we get for the vm-thread or a thread which 118 // is compiling. We just install a dummy exception object 119 // 120 // We also cannot throw a proper exception when dumping, because we cannot run 121 // Java bytecodes now. A dummy exception will suffice. 122 thread->set_pending_exception(Universe::vm_exception(), file, line); 123 return true; 124 } 125 return false; 126 } 127 128 // This method should only be called from generated code, 129 // therefore the exception oop should be in the oopmap. 130 void Exceptions::_throw_oop(Thread* thread, const char* file, int line, oop exception) { 131 assert(exception != NULL, "exception should not be NULL"); 132 Handle h_exception = Handle(thread, exception); 133 _throw(thread, file, line, h_exception); 134 } 135 136 void Exceptions::_throw(Thread* thread, const char* file, int line, Handle h_exception, const char* message) { 137 ResourceMark rm; 138 assert(h_exception() != NULL, "exception should not be NULL"); 139 140 // tracing (do this up front - so it works during boot strapping) 141 log_info(exceptions)("Exception <%s%s%s> (" INTPTR_FORMAT ") \n" 142 "thrown [%s, line %d]\nfor thread " INTPTR_FORMAT, 143 h_exception->print_value_string(), 144 message ? ": " : "", message ? message : "", 145 p2i(h_exception()), file, line, p2i(thread)); 146 // for AbortVMOnException flag 147 Exceptions::debug_check_abort(h_exception, message); 148 149 // Check for special boot-strapping/vm-thread handling 150 if (special_exception(thread, file, line, h_exception)) { 151 return; 152 } 153 154 if (h_exception->is_a(SystemDictionary::OutOfMemoryError_klass())) { 155 count_out_of_memory_exceptions(h_exception); 156 } 157 158 assert(h_exception->is_a(SystemDictionary::Throwable_klass()), "exception is not a subclass of java/lang/Throwable"); 159 160 // set the pending exception 161 thread->set_pending_exception(h_exception(), file, line); 162 163 // vm log 164 if (LogEvents){ 165 Events::log_exception(thread, "Exception <%s%s%s> (" INTPTR_FORMAT ") thrown at [%s, line %d]", 166 h_exception->print_value_string(), message ? ": " : "", message ? message : "", 167 p2i(h_exception()), file, line); 168 } 169 } 170 171 172 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message, 173 Handle h_loader, Handle h_protection_domain) { 174 // Check for special boot-strapping/vm-thread handling 175 if (special_exception(thread, file, line, name, message)) return; 176 // Create and throw exception 177 Handle h_cause(thread, NULL); 178 Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain); 179 _throw(thread, file, line, h_exception, message); 180 } 181 182 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause, 183 Handle h_loader, Handle h_protection_domain) { 184 // Check for special boot-strapping/vm-thread handling 185 if (special_exception(thread, file, line, name, message)) return; 186 // Create and throw exception and init cause 187 Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain); 188 _throw(thread, file, line, h_exception, message); 189 } 190 191 void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause, 192 Handle h_loader, Handle h_protection_domain) { 193 // Check for special boot-strapping/vm-thread handling 194 if (special_exception(thread, file, line, h_cause)) return; 195 // Create and throw exception 196 Handle h_exception = new_exception(thread, name, h_cause, h_loader, h_protection_domain); 197 _throw(thread, file, line, h_exception, NULL); 198 } 199 200 void Exceptions::_throw_args(Thread* thread, const char* file, int line, Symbol* name, Symbol* signature, JavaCallArguments *args) { 201 // Check for special boot-strapping/vm-thread handling 202 if (special_exception(thread, file, line, name, NULL)) return; 203 // Create and throw exception 204 Handle h_loader(thread, NULL); 205 Handle h_prot(thread, NULL); 206 Handle exception = new_exception(thread, name, signature, args, h_loader, h_prot); 207 _throw(thread, file, line, exception); 208 } 209 210 211 // Methods for default parameters. 212 // NOTE: These must be here (and not in the header file) because of include circularities. 213 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause) { 214 _throw_msg_cause(thread, file, line, name, message, h_cause, Handle(thread, NULL), Handle(thread, NULL)); 215 } 216 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message) { 217 _throw_msg(thread, file, line, name, message, Handle(thread, NULL), Handle(thread, NULL)); 218 } 219 void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause) { 220 _throw_cause(thread, file, line, name, h_cause, Handle(thread, NULL), Handle(thread, NULL)); 221 } 222 223 224 void Exceptions::throw_stack_overflow_exception(Thread* THREAD, const char* file, int line, const methodHandle& method) { 225 Handle exception; 226 if (!THREAD->has_pending_exception()) { 227 Klass* k = SystemDictionary::StackOverflowError_klass(); 228 oop e = InstanceKlass::cast(k)->allocate_instance(CHECK); 229 exception = Handle(THREAD, e); // fill_in_stack trace does gc 230 assert(InstanceKlass::cast(k)->is_initialized(), "need to increase min_stack_allowed calculation"); 231 if (StackTraceInThrowable) { 232 java_lang_Throwable::fill_in_stack_trace(exception, method()); 233 } 234 // Increment counter for hs_err file reporting 235 Atomic::inc(&Exceptions::_stack_overflow_errors); 236 } else { 237 // if prior exception, throw that one instead 238 exception = Handle(THREAD, THREAD->pending_exception()); 239 } 240 _throw(THREAD, file, line, exception); 241 } 242 243 void Exceptions::fthrow(Thread* thread, const char* file, int line, Symbol* h_name, const char* format, ...) { 244 const int max_msg_size = 1024; 245 va_list ap; 246 va_start(ap, format); 247 char msg[max_msg_size]; 248 vsnprintf(msg, max_msg_size, format, ap); 249 msg[max_msg_size-1] = '\0'; 250 va_end(ap); 251 _throw_msg(thread, file, line, h_name, msg); 252 } 253 254 255 // Creates an exception oop, calls the <init> method with the given signature. 256 // and returns a Handle 257 Handle Exceptions::new_exception(Thread *thread, Symbol* name, 258 Symbol* signature, JavaCallArguments *args, 259 Handle h_loader, Handle h_protection_domain) { 260 assert(Universe::is_fully_initialized(), 261 "cannot be called during initialization"); 262 assert(thread->is_Java_thread(), "can only be called by a Java thread"); 263 assert(!thread->has_pending_exception(), "already has exception"); 264 265 Handle h_exception; 266 267 // Resolve exception klass 268 Klass* ik = SystemDictionary::resolve_or_fail(name, h_loader, h_protection_domain, true, thread); 269 instanceKlassHandle klass(thread, ik); 270 271 if (!thread->has_pending_exception()) { 272 assert(klass.not_null(), "klass must exist"); 273 // We are about to create an instance - so make sure that klass is initialized 274 klass->initialize(thread); 275 if (!thread->has_pending_exception()) { 276 // Allocate new exception 277 h_exception = klass->allocate_instance_handle(thread); 278 if (!thread->has_pending_exception()) { 279 JavaValue result(T_VOID); 280 args->set_receiver(h_exception); 281 // Call constructor 282 JavaCalls::call_special(&result, klass, 283 vmSymbols::object_initializer_name(), 284 signature, 285 args, 286 thread); 287 } 288 } 289 } 290 291 // Check if another exception was thrown in the process, if so rethrow that one 292 if (thread->has_pending_exception()) { 293 h_exception = Handle(thread, thread->pending_exception()); 294 thread->clear_pending_exception(); 295 } 296 return h_exception; 297 } 298 299 // Creates an exception oop, calls the <init> method with the given signature. 300 // and returns a Handle 301 // Initializes the cause if cause non-null 302 Handle Exceptions::new_exception(Thread *thread, Symbol* name, 303 Symbol* signature, JavaCallArguments *args, 304 Handle h_cause, 305 Handle h_loader, Handle h_protection_domain) { 306 Handle h_exception = new_exception(thread, name, signature, args, h_loader, h_protection_domain); 307 308 // Future: object initializer should take a cause argument 309 if (h_cause.not_null()) { 310 assert(h_cause->is_a(SystemDictionary::Throwable_klass()), 311 "exception cause is not a subclass of java/lang/Throwable"); 312 JavaValue result1(T_OBJECT); 313 JavaCallArguments args1; 314 args1.set_receiver(h_exception); 315 args1.push_oop(h_cause); 316 JavaCalls::call_virtual(&result1, h_exception->klass(), 317 vmSymbols::initCause_name(), 318 vmSymbols::throwable_throwable_signature(), 319 &args1, 320 thread); 321 } 322 323 // Check if another exception was thrown in the process, if so rethrow that one 324 if (thread->has_pending_exception()) { 325 h_exception = Handle(thread, thread->pending_exception()); 326 thread->clear_pending_exception(); 327 } 328 return h_exception; 329 } 330 331 // Convenience method. Calls either the <init>() or <init>(Throwable) method when 332 // creating a new exception 333 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 334 Handle h_cause, 335 Handle h_loader, Handle h_protection_domain, 336 ExceptionMsgToUtf8Mode to_utf8_safe) { 337 JavaCallArguments args; 338 Symbol* signature = NULL; 339 if (h_cause.is_null()) { 340 signature = vmSymbols::void_method_signature(); 341 } else { 342 signature = vmSymbols::throwable_void_signature(); 343 args.push_oop(h_cause); 344 } 345 return new_exception(thread, name, signature, &args, h_loader, h_protection_domain); 346 } 347 348 // Convenience method. Calls either the <init>() or <init>(String) method when 349 // creating a new exception 350 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 351 const char* message, Handle h_cause, 352 Handle h_loader, Handle h_protection_domain, 353 ExceptionMsgToUtf8Mode to_utf8_safe) { 354 JavaCallArguments args; 355 Symbol* signature = NULL; 356 if (message == NULL) { 357 signature = vmSymbols::void_method_signature(); 358 } else { 359 // We want to allocate storage, but we can't do that if there's 360 // a pending exception, so we preserve any pending exception 361 // around the allocation. 362 // If we get an exception from the allocation, prefer that to 363 // the exception we are trying to build, or the pending exception. 364 // This is sort of like what PRESERVE_EXCEPTION_MARK does, except 365 // for the preferencing and the early returns. 366 Handle incoming_exception(thread, NULL); 367 if (thread->has_pending_exception()) { 368 incoming_exception = Handle(thread, thread->pending_exception()); 369 thread->clear_pending_exception(); 370 } 371 Handle msg; 372 if (to_utf8_safe == safe_to_utf8) { 373 // Make a java UTF8 string. 374 msg = java_lang_String::create_from_str(message, thread); 375 } else { 376 // Make a java string keeping the encoding scheme of the original string. 377 msg = java_lang_String::create_from_platform_dependent_str(message, thread); 378 } 379 if (thread->has_pending_exception()) { 380 Handle exception(thread, thread->pending_exception()); 381 thread->clear_pending_exception(); 382 return exception; 383 } 384 if (incoming_exception.not_null()) { 385 return incoming_exception; 386 } 387 args.push_oop(msg); 388 signature = vmSymbols::string_void_signature(); 389 } 390 return new_exception(thread, name, signature, &args, h_cause, h_loader, h_protection_domain); 391 } 392 393 // Another convenience method that creates handles for null class loaders and 394 // protection domains and null causes. 395 // If the last parameter 'to_utf8_mode' is safe_to_utf8, 396 // it means we can safely ignore the encoding scheme of the message string and 397 // convert it directly to a java UTF8 string. Otherwise, we need to take the 398 // encoding scheme of the string into account. One thing we should do at some 399 // point is to push this flag down to class java_lang_String since other 400 // classes may need similar functionalities. 401 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 402 const char* message, 403 ExceptionMsgToUtf8Mode to_utf8_safe) { 404 405 Handle h_loader(thread, NULL); 406 Handle h_prot(thread, NULL); 407 Handle h_cause(thread, NULL); 408 return Exceptions::new_exception(thread, name, message, h_cause, h_loader, 409 h_prot, to_utf8_safe); 410 } 411 412 413 // Exception counting for hs_err file 414 volatile int Exceptions::_stack_overflow_errors = 0; 415 volatile int Exceptions::_out_of_memory_error_java_heap_errors = 0; 416 volatile int Exceptions::_out_of_memory_error_metaspace_errors = 0; 417 volatile int Exceptions::_out_of_memory_error_class_metaspace_errors = 0; 418 419 void Exceptions::count_out_of_memory_exceptions(Handle exception) { 420 if (exception() == Universe::out_of_memory_error_metaspace()) { 421 Atomic::inc(&_out_of_memory_error_metaspace_errors); 422 } else if (exception() == Universe::out_of_memory_error_class_metaspace()) { 423 Atomic::inc(&_out_of_memory_error_class_metaspace_errors); 424 } else { 425 // everything else reported as java heap OOM 426 Atomic::inc(&_out_of_memory_error_java_heap_errors); 427 } 428 } 429 430 void print_oom_count(outputStream* st, const char *err, int count) { 431 if (count > 0) { 432 st->print_cr("OutOfMemoryError %s=%d", err, count); 433 } 434 } 435 436 bool Exceptions::has_exception_counts() { 437 return (_stack_overflow_errors + _out_of_memory_error_java_heap_errors + 438 _out_of_memory_error_metaspace_errors + _out_of_memory_error_class_metaspace_errors) > 0; 439 } 440 441 void Exceptions::print_exception_counts_on_error(outputStream* st) { 442 print_oom_count(st, "java_heap_errors", _out_of_memory_error_java_heap_errors); 443 print_oom_count(st, "metaspace_errors", _out_of_memory_error_metaspace_errors); 444 print_oom_count(st, "class_metaspace_errors", _out_of_memory_error_class_metaspace_errors); 445 if (_stack_overflow_errors > 0) { 446 st->print_cr("StackOverflowErrors=%d", _stack_overflow_errors); 447 } 448 } 449 450 // Implementation of ExceptionMark 451 452 ExceptionMark::ExceptionMark(Thread*& thread) { 453 thread = Thread::current(); 454 _thread = thread; 455 if (_thread->has_pending_exception()) { 456 oop exception = _thread->pending_exception(); 457 _thread->clear_pending_exception(); // Needed to avoid infinite recursion 458 exception->print(); 459 fatal("ExceptionMark constructor expects no pending exceptions"); 460 } 461 } 462 463 464 ExceptionMark::~ExceptionMark() { 465 if (_thread->has_pending_exception()) { 466 Handle exception(_thread, _thread->pending_exception()); 467 _thread->clear_pending_exception(); // Needed to avoid infinite recursion 468 if (is_init_completed()) { 469 exception->print(); 470 fatal("ExceptionMark destructor expects no pending exceptions"); 471 } else { 472 vm_exit_during_initialization(exception); 473 } 474 } 475 } 476 477 // ---------------------------------------------------------------------------------------- 478 479 // caller frees value_string if necessary 480 void Exceptions::debug_check_abort(const char *value_string, const char* message) { 481 if (AbortVMOnException != NULL && value_string != NULL && 482 strstr(value_string, AbortVMOnException)) { 483 if (AbortVMOnExceptionMessage == NULL || (message != NULL && 484 strstr(message, AbortVMOnExceptionMessage))) { 485 fatal("Saw %s, aborting", value_string); 486 } 487 } 488 } 489 490 void Exceptions::debug_check_abort(Handle exception, const char* message) { 491 if (AbortVMOnException != NULL) { 492 debug_check_abort_helper(exception, message); 493 } 494 } 495 496 void Exceptions::debug_check_abort_helper(Handle exception, const char* message) { 497 ResourceMark rm; 498 if (message == NULL && exception->is_a(SystemDictionary::Throwable_klass())) { 499 oop msg = java_lang_Throwable::message(exception); 500 if (msg != NULL) { 501 message = java_lang_String::as_utf8_string(msg); 502 } 503 } 504 debug_check_abort(exception()->klass()->external_name(), message); 505 } 506 507 // for logging exceptions 508 void Exceptions::log_exception(Handle exception, stringStream tempst) { 509 ResourceMark rm; 510 Symbol* message = java_lang_Throwable::detail_message(exception()); 511 if (message != NULL) { 512 log_info(exceptions)("Exception <%s: %s>\n thrown in %s", 513 exception->print_value_string(), 514 message->as_C_string(), 515 tempst.as_string()); 516 } else { 517 log_info(exceptions)("Exception <%s>\n thrown in %s", 518 exception->print_value_string(), 519 tempst.as_string()); 520 } 521 }