1 /* 2 * Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "compiler/compileBroker.hpp" 29 #include "oops/oop.inline.hpp" 30 #include "runtime/init.hpp" 31 #include "runtime/java.hpp" 32 #include "runtime/javaCalls.hpp" 33 #include "runtime/thread.inline.hpp" 34 #include "runtime/threadCritical.hpp" 35 #include "utilities/events.hpp" 36 #include "utilities/exceptions.hpp" 37 38 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 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 (TraceClearedExceptions) { 57 if (_pending_exception != NULL) { 58 tty->print_cr("Thread::clear_pending_exception: cleared exception:"); 59 _pending_exception->print(); 60 } 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->is_Compiler_thread() 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->is_Compiler_thread() 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 if (TraceExceptions) { 142 ttyLocker ttyl; 143 tty->print_cr("Exception <%s%s%s> (" INTPTR_FORMAT ") \n" 144 "thrown [%s, line %d]\nfor thread " INTPTR_FORMAT, 145 h_exception->print_value_string(), 146 message ? ": " : "", message ? message : "", 147 (address)h_exception(), file, line, thread); 148 } 149 // for AbortVMOnException flag 150 NOT_PRODUCT(Exceptions::debug_check_abort(h_exception, message)); 151 152 // Check for special boot-strapping/vm-thread handling 153 if (special_exception(thread, file, line, h_exception)) { 154 return; 155 } 156 157 if (h_exception->is_a(SystemDictionary::OutOfMemoryError_klass())) { 158 count_out_of_memory_exceptions(h_exception); 159 } 160 161 assert(h_exception->is_a(SystemDictionary::Throwable_klass()), "exception is not a subclass of java/lang/Throwable"); 162 163 // set the pending exception 164 thread->set_pending_exception(h_exception(), file, line); 165 166 // vm log 167 if (LogEvents){ 168 Events::log_exception(thread, "Exception <%s%s%s> (" INTPTR_FORMAT ") thrown at [%s, line %d]", 169 h_exception->print_value_string(), message ? ": " : "", message ? message : "", 170 (address)h_exception(), file, line); 171 } 172 } 173 174 175 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message, 176 Handle h_loader, Handle h_protection_domain) { 177 // Check for special boot-strapping/vm-thread handling 178 if (special_exception(thread, file, line, name, message)) return; 179 // Create and throw exception 180 Handle h_cause(thread, NULL); 181 Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain); 182 _throw(thread, file, line, h_exception, message); 183 } 184 185 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause, 186 Handle h_loader, Handle h_protection_domain) { 187 // Check for special boot-strapping/vm-thread handling 188 if (special_exception(thread, file, line, name, message)) return; 189 // Create and throw exception and init cause 190 Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain); 191 _throw(thread, file, line, h_exception, message); 192 } 193 194 void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause, 195 Handle h_loader, Handle h_protection_domain) { 196 // Check for special boot-strapping/vm-thread handling 197 if (special_exception(thread, file, line, h_cause)) return; 198 // Create and throw exception 199 Handle h_exception = new_exception(thread, name, h_cause, h_loader, h_protection_domain); 200 _throw(thread, file, line, h_exception, NULL); 201 } 202 203 void Exceptions::_throw_args(Thread* thread, const char* file, int line, Symbol* name, Symbol* signature, JavaCallArguments *args) { 204 // Check for special boot-strapping/vm-thread handling 205 if (special_exception(thread, file, line, name, NULL)) return; 206 // Create and throw exception 207 Handle h_loader(thread, NULL); 208 Handle h_prot(thread, NULL); 209 Handle exception = new_exception(thread, name, signature, args, h_loader, h_prot); 210 _throw(thread, file, line, exception); 211 } 212 213 214 // Methods for default parameters. 215 // NOTE: These must be here (and not in the header file) because of include circularities. 216 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause) { 217 _throw_msg_cause(thread, file, line, name, message, h_cause, Handle(thread, NULL), Handle(thread, NULL)); 218 } 219 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message) { 220 _throw_msg(thread, file, line, name, message, Handle(thread, NULL), Handle(thread, NULL)); 221 } 222 void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause) { 223 _throw_cause(thread, file, line, name, h_cause, Handle(thread, NULL), Handle(thread, NULL)); 224 } 225 226 227 void Exceptions::throw_stack_overflow_exception(Thread* THREAD, const char* file, int line, methodHandle method) { 228 Handle exception; 229 if (!THREAD->has_pending_exception()) { 230 Klass* k = SystemDictionary::StackOverflowError_klass(); 231 oop e = InstanceKlass::cast(k)->allocate_instance(CHECK); 232 exception = Handle(THREAD, e); // fill_in_stack trace does gc 233 assert(InstanceKlass::cast(k)->is_initialized(), "need to increase min_stack_allowed calculation"); 234 if (StackTraceInThrowable) { 235 java_lang_Throwable::fill_in_stack_trace(exception, method()); 236 } 237 // Increment counter for hs_err file reporting 238 Atomic::inc(&Exceptions::_stack_overflow_errors); 239 } else { 240 // if prior exception, throw that one instead 241 exception = Handle(THREAD, THREAD->pending_exception()); 242 } 243 _throw(THREAD, file, line, exception); 244 } 245 246 void Exceptions::fthrow(Thread* thread, const char* file, int line, Symbol* h_name, const char* format, ...) { 247 const int max_msg_size = 1024; 248 va_list ap; 249 va_start(ap, format); 250 char msg[max_msg_size]; 251 vsnprintf(msg, max_msg_size, format, ap); 252 msg[max_msg_size-1] = '\0'; 253 va_end(ap); 254 _throw_msg(thread, file, line, h_name, msg); 255 } 256 257 258 // Creates an exception oop, calls the <init> method with the given signature. 259 // and returns a Handle 260 Handle Exceptions::new_exception(Thread *thread, Symbol* name, 261 Symbol* signature, JavaCallArguments *args, 262 Handle h_loader, Handle h_protection_domain) { 263 assert(Universe::is_fully_initialized(), 264 "cannot be called during initialization"); 265 assert(thread->is_Java_thread(), "can only be called by a Java thread"); 266 assert(!thread->has_pending_exception(), "already has exception"); 267 268 Handle h_exception; 269 270 // Resolve exception klass 271 Klass* ik = SystemDictionary::resolve_or_fail(name, h_loader, h_protection_domain, true, thread); 272 instanceKlassHandle klass(thread, ik); 273 274 if (!thread->has_pending_exception()) { 275 assert(klass.not_null(), "klass must exist"); 276 // We are about to create an instance - so make sure that klass is initialized 277 klass->initialize(thread); 278 if (!thread->has_pending_exception()) { 279 // Allocate new exception 280 h_exception = klass->allocate_instance_handle(thread); 281 if (!thread->has_pending_exception()) { 282 JavaValue result(T_VOID); 283 args->set_receiver(h_exception); 284 // Call constructor 285 JavaCalls::call_special(&result, klass, 286 vmSymbols::object_initializer_name(), 287 signature, 288 args, 289 thread); 290 } 291 } 292 } 293 294 // Check if another exception was thrown in the process, if so rethrow that one 295 if (thread->has_pending_exception()) { 296 h_exception = Handle(thread, thread->pending_exception()); 297 thread->clear_pending_exception(); 298 } 299 return h_exception; 300 } 301 302 // Creates an exception oop, calls the <init> method with the given signature. 303 // and returns a Handle 304 // Initializes the cause if cause non-null 305 Handle Exceptions::new_exception(Thread *thread, Symbol* name, 306 Symbol* signature, JavaCallArguments *args, 307 Handle h_cause, 308 Handle h_loader, Handle h_protection_domain) { 309 Handle h_exception = new_exception(thread, name, signature, args, h_loader, h_protection_domain); 310 311 // Future: object initializer should take a cause argument 312 if (h_cause.not_null()) { 313 assert(h_cause->is_a(SystemDictionary::Throwable_klass()), 314 "exception cause is not a subclass of java/lang/Throwable"); 315 JavaValue result1(T_OBJECT); 316 JavaCallArguments args1; 317 args1.set_receiver(h_exception); 318 args1.push_oop(h_cause); 319 JavaCalls::call_virtual(&result1, h_exception->klass(), 320 vmSymbols::initCause_name(), 321 vmSymbols::throwable_throwable_signature(), 322 &args1, 323 thread); 324 } 325 326 // Check if another exception was thrown in the process, if so rethrow that one 327 if (thread->has_pending_exception()) { 328 h_exception = Handle(thread, thread->pending_exception()); 329 thread->clear_pending_exception(); 330 } 331 return h_exception; 332 } 333 334 // Convenience method. Calls either the <init>() or <init>(Throwable) method when 335 // creating a new exception 336 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 337 Handle h_cause, 338 Handle h_loader, Handle h_protection_domain, 339 ExceptionMsgToUtf8Mode to_utf8_safe) { 340 JavaCallArguments args; 341 Symbol* signature = NULL; 342 if (h_cause.is_null()) { 343 signature = vmSymbols::void_method_signature(); 344 } else { 345 signature = vmSymbols::throwable_void_signature(); 346 args.push_oop(h_cause); 347 } 348 return new_exception(thread, name, signature, &args, h_loader, h_protection_domain); 349 } 350 351 // Convenience method. Calls either the <init>() or <init>(String) method when 352 // creating a new exception 353 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 354 const char* message, Handle h_cause, 355 Handle h_loader, Handle h_protection_domain, 356 ExceptionMsgToUtf8Mode to_utf8_safe) { 357 JavaCallArguments args; 358 Symbol* signature = NULL; 359 if (message == NULL) { 360 signature = vmSymbols::void_method_signature(); 361 } else { 362 // We want to allocate storage, but we can't do that if there's 363 // a pending exception, so we preserve any pending exception 364 // around the allocation. 365 // If we get an exception from the allocation, prefer that to 366 // the exception we are trying to build, or the pending exception. 367 // This is sort of like what PRESERVE_EXCEPTION_MARK does, except 368 // for the preferencing and the early returns. 369 Handle incoming_exception(thread, NULL); 370 if (thread->has_pending_exception()) { 371 incoming_exception = Handle(thread, thread->pending_exception()); 372 thread->clear_pending_exception(); 373 } 374 Handle msg; 375 if (to_utf8_safe == safe_to_utf8) { 376 // Make a java UTF8 string. 377 msg = java_lang_String::create_from_str(message, thread); 378 } else { 379 // Make a java string keeping the encoding scheme of the original string. 380 msg = java_lang_String::create_from_platform_dependent_str(message, thread); 381 } 382 if (thread->has_pending_exception()) { 383 Handle exception(thread, thread->pending_exception()); 384 thread->clear_pending_exception(); 385 return exception; 386 } 387 if (incoming_exception.not_null()) { 388 return incoming_exception; 389 } 390 args.push_oop(msg); 391 signature = vmSymbols::string_void_signature(); 392 } 393 return new_exception(thread, name, signature, &args, h_cause, h_loader, h_protection_domain); 394 } 395 396 // Another convenience method that creates handles for null class loaders and 397 // protection domains and null causes. 398 // If the last parameter 'to_utf8_mode' is safe_to_utf8, 399 // it means we can safely ignore the encoding scheme of the message string and 400 // convert it directly to a java UTF8 string. Otherwise, we need to take the 401 // encoding scheme of the string into account. One thing we should do at some 402 // point is to push this flag down to class java_lang_String since other 403 // classes may need similar functionalities. 404 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 405 const char* message, 406 ExceptionMsgToUtf8Mode to_utf8_safe) { 407 408 Handle h_loader(thread, NULL); 409 Handle h_prot(thread, NULL); 410 Handle h_cause(thread, NULL); 411 return Exceptions::new_exception(thread, name, message, h_cause, h_loader, 412 h_prot, to_utf8_safe); 413 } 414 415 416 // Exception counting for hs_err file 417 volatile int Exceptions::_stack_overflow_errors = 0; 418 volatile int Exceptions::_out_of_memory_error_java_heap_errors = 0; 419 volatile int Exceptions::_out_of_memory_error_metaspace_errors = 0; 420 volatile int Exceptions::_out_of_memory_error_class_metaspace_errors = 0; 421 422 void Exceptions::count_out_of_memory_exceptions(Handle exception) { 423 if (exception() == Universe::out_of_memory_error_metaspace()) { 424 Atomic::inc(&_out_of_memory_error_metaspace_errors); 425 } else if (exception() == Universe::out_of_memory_error_class_metaspace()) { 426 Atomic::inc(&_out_of_memory_error_class_metaspace_errors); 427 } else { 428 // everything else reported as java heap OOM 429 Atomic::inc(&_out_of_memory_error_java_heap_errors); 430 } 431 } 432 433 void print_oom_count(outputStream* st, const char *err, int count) { 434 if (count > 0) { 435 st->print_cr("OutOfMemoryError %s=%d", err, count); 436 } 437 } 438 439 bool Exceptions::has_exception_counts() { 440 return (_stack_overflow_errors + _out_of_memory_error_java_heap_errors + 441 _out_of_memory_error_metaspace_errors + _out_of_memory_error_class_metaspace_errors) > 0; 442 } 443 444 void Exceptions::print_exception_counts_on_error(outputStream* st) { 445 print_oom_count(st, "java_heap_errors", _out_of_memory_error_java_heap_errors); 446 print_oom_count(st, "metaspace_errors", _out_of_memory_error_metaspace_errors); 447 print_oom_count(st, "class_metaspace_errors", _out_of_memory_error_class_metaspace_errors); 448 if (_stack_overflow_errors > 0) { 449 st->print_cr("StackOverflowErrors=%d", _stack_overflow_errors); 450 } 451 } 452 453 // Implementation of ExceptionMark 454 455 ExceptionMark::ExceptionMark(Thread*& thread) { 456 thread = Thread::current(); 457 _thread = thread; 458 if (_thread->has_pending_exception()) { 459 oop exception = _thread->pending_exception(); 460 _thread->clear_pending_exception(); // Needed to avoid infinite recursion 461 exception->print(); 462 fatal("ExceptionMark constructor expects no pending exceptions"); 463 } 464 } 465 466 467 ExceptionMark::~ExceptionMark() { 468 if (_thread->has_pending_exception()) { 469 Handle exception(_thread, _thread->pending_exception()); 470 _thread->clear_pending_exception(); // Needed to avoid infinite recursion 471 if (is_init_completed()) { 472 exception->print(); 473 fatal("ExceptionMark destructor expects no pending exceptions"); 474 } else { 475 vm_exit_during_initialization(exception); 476 } 477 } 478 } 479 480 // ---------------------------------------------------------------------------------------- 481 482 #ifndef PRODUCT 483 // caller frees value_string if necessary 484 void Exceptions::debug_check_abort(const char *value_string, const char* message) { 485 if (AbortVMOnException != NULL && value_string != NULL && 486 strstr(value_string, AbortVMOnException)) { 487 if (AbortVMOnExceptionMessage == NULL || message == NULL || 488 strcmp(message, AbortVMOnExceptionMessage) == 0) { 489 fatal(err_msg("Saw %s, aborting", value_string)); 490 } 491 } 492 } 493 494 void Exceptions::debug_check_abort(Handle exception, const char* message) { 495 if (AbortVMOnException != NULL) { 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(InstanceKlass::cast(exception()->klass())->external_name(), message); 504 } 505 } 506 #endif