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/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 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 Events::log_exception(thread, "Exception <%s%s%s> (" INTPTR_FORMAT ") thrown at [%s, line %d]", 164 h_exception->print_value_string(), message ? ": " : "", message ? message : "", 165 (address)h_exception(), file, line); 166 } 167 168 169 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message, 170 Handle h_loader, Handle h_protection_domain) { 171 // Check for special boot-strapping/vm-thread handling 172 if (special_exception(thread, file, line, name, message)) return; 173 // Create and throw exception 174 Handle h_cause(thread, NULL); 175 Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain); 176 _throw(thread, file, line, h_exception, message); 177 } 178 179 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause, 180 Handle h_loader, Handle h_protection_domain) { 181 // Check for special boot-strapping/vm-thread handling 182 if (special_exception(thread, file, line, name, message)) return; 183 // Create and throw exception and init cause 184 Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain); 185 _throw(thread, file, line, h_exception, message); 186 } 187 188 void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause, 189 Handle h_loader, Handle h_protection_domain) { 190 // Check for special boot-strapping/vm-thread handling 191 if (special_exception(thread, file, line, h_cause)) return; 192 // Create and throw exception 193 Handle h_exception = new_exception(thread, name, h_cause, h_loader, h_protection_domain); 194 _throw(thread, file, line, h_exception, NULL); 195 } 196 197 void Exceptions::_throw_args(Thread* thread, const char* file, int line, Symbol* name, Symbol* signature, JavaCallArguments *args) { 198 // Check for special boot-strapping/vm-thread handling 199 if (special_exception(thread, file, line, name, NULL)) return; 200 // Create and throw exception 201 Handle h_loader(thread, NULL); 202 Handle h_prot(thread, NULL); 203 Handle exception = new_exception(thread, name, signature, args, h_loader, h_prot); 204 _throw(thread, file, line, exception); 205 } 206 207 208 // Methods for default parameters. 209 // NOTE: These must be here (and not in the header file) because of include circularities. 210 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause) { 211 _throw_msg_cause(thread, file, line, name, message, h_cause, Handle(thread, NULL), Handle(thread, NULL)); 212 } 213 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message) { 214 _throw_msg(thread, file, line, name, message, Handle(thread, NULL), Handle(thread, NULL)); 215 } 216 void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause) { 217 _throw_cause(thread, file, line, name, h_cause, Handle(thread, NULL), Handle(thread, NULL)); 218 } 219 220 221 void Exceptions::throw_stack_overflow_exception(Thread* THREAD, const char* file, int line, methodHandle method) { 222 Handle exception; 223 if (!THREAD->has_pending_exception()) { 224 Klass* k = SystemDictionary::StackOverflowError_klass(); 225 oop e = InstanceKlass::cast(k)->allocate_instance(CHECK); 226 exception = Handle(THREAD, e); // fill_in_stack trace does gc 227 assert(InstanceKlass::cast(k)->is_initialized(), "need to increase min_stack_allowed calculation"); 228 if (StackTraceInThrowable) { 229 java_lang_Throwable::fill_in_stack_trace(exception, method()); 230 } 231 } else { 232 // if prior exception, throw that one instead 233 exception = Handle(THREAD, THREAD->pending_exception()); 234 } 235 _throw(THREAD, file, line, exception); 236 } 237 238 void Exceptions::fthrow(Thread* thread, const char* file, int line, Symbol* h_name, const char* format, ...) { 239 const int max_msg_size = 1024; 240 va_list ap; 241 va_start(ap, format); 242 char msg[max_msg_size]; 243 vsnprintf(msg, max_msg_size, format, ap); 244 msg[max_msg_size-1] = '\0'; 245 va_end(ap); 246 _throw_msg(thread, file, line, h_name, msg); 247 } 248 249 250 // Creates an exception oop, calls the <init> method with the given signature. 251 // and returns a Handle 252 Handle Exceptions::new_exception(Thread *thread, Symbol* name, 253 Symbol* signature, JavaCallArguments *args, 254 Handle h_loader, Handle h_protection_domain) { 255 assert(Universe::is_fully_initialized(), 256 "cannot be called during initialization"); 257 assert(thread->is_Java_thread(), "can only be called by a Java thread"); 258 assert(!thread->has_pending_exception(), "already has exception"); 259 260 Handle h_exception; 261 262 // Resolve exception klass 263 Klass* ik = SystemDictionary::resolve_or_fail(name, h_loader, h_protection_domain, true, thread); 264 instanceKlassHandle klass(thread, ik); 265 266 if (!thread->has_pending_exception()) { 267 assert(klass.not_null(), "klass must exist"); 268 // We are about to create an instance - so make sure that klass is initialized 269 klass->initialize(thread); 270 if (!thread->has_pending_exception()) { 271 // Allocate new exception 272 h_exception = klass->allocate_instance_handle(thread); 273 if (!thread->has_pending_exception()) { 274 JavaValue result(T_VOID); 275 args->set_receiver(h_exception); 276 // Call constructor 277 JavaCalls::call_special(&result, klass, 278 vmSymbols::object_initializer_name(), 279 signature, 280 args, 281 thread); 282 } 283 } 284 } 285 286 // Check if another exception was thrown in the process, if so rethrow that one 287 if (thread->has_pending_exception()) { 288 h_exception = Handle(thread, thread->pending_exception()); 289 thread->clear_pending_exception(); 290 } 291 return h_exception; 292 } 293 294 // Creates an exception oop, calls the <init> method with the given signature. 295 // and returns a Handle 296 // Initializes the cause if cause non-null 297 Handle Exceptions::new_exception(Thread *thread, Symbol* name, 298 Symbol* signature, JavaCallArguments *args, 299 Handle h_cause, 300 Handle h_loader, Handle h_protection_domain) { 301 Handle h_exception = new_exception(thread, name, signature, args, h_loader, h_protection_domain); 302 303 // Future: object initializer should take a cause argument 304 if (h_cause.not_null()) { 305 assert(h_cause->is_a(SystemDictionary::Throwable_klass()), 306 "exception cause is not a subclass of java/lang/Throwable"); 307 JavaValue result1(T_OBJECT); 308 JavaCallArguments args1; 309 args1.set_receiver(h_exception); 310 args1.push_oop(h_cause); 311 JavaCalls::call_virtual(&result1, h_exception->klass(), 312 vmSymbols::initCause_name(), 313 vmSymbols::throwable_throwable_signature(), 314 &args1, 315 thread); 316 } 317 318 // Check if another exception was thrown in the process, if so rethrow that one 319 if (thread->has_pending_exception()) { 320 h_exception = Handle(thread, thread->pending_exception()); 321 thread->clear_pending_exception(); 322 } 323 return h_exception; 324 } 325 326 // Convenience method. Calls either the <init>() or <init>(Throwable) method when 327 // creating a new exception 328 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 329 Handle h_cause, 330 Handle h_loader, Handle h_protection_domain, 331 ExceptionMsgToUtf8Mode to_utf8_safe) { 332 JavaCallArguments args; 333 Symbol* signature = NULL; 334 if (h_cause.is_null()) { 335 signature = vmSymbols::void_method_signature(); 336 } else { 337 signature = vmSymbols::throwable_void_signature(); 338 args.push_oop(h_cause); 339 } 340 return new_exception(thread, name, signature, &args, h_loader, h_protection_domain); 341 } 342 343 // Convenience method. Calls either the <init>() or <init>(String) method when 344 // creating a new exception 345 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 346 const char* message, Handle h_cause, 347 Handle h_loader, Handle h_protection_domain, 348 ExceptionMsgToUtf8Mode to_utf8_safe) { 349 JavaCallArguments args; 350 Symbol* signature = NULL; 351 if (message == NULL) { 352 signature = vmSymbols::void_method_signature(); 353 } else { 354 // We want to allocate storage, but we can't do that if there's 355 // a pending exception, so we preserve any pending exception 356 // around the allocation. 357 // If we get an exception from the allocation, prefer that to 358 // the exception we are trying to build, or the pending exception. 359 // This is sort of like what PRESERVE_EXCEPTION_MARK does, except 360 // for the preferencing and the early returns. 361 Handle incoming_exception(thread, NULL); 362 if (thread->has_pending_exception()) { 363 incoming_exception = Handle(thread, thread->pending_exception()); 364 thread->clear_pending_exception(); 365 } 366 Handle msg; 367 if (to_utf8_safe == safe_to_utf8) { 368 // Make a java UTF8 string. 369 msg = java_lang_String::create_from_str(message, thread); 370 } else { 371 // Make a java string keeping the encoding scheme of the original string. 372 msg = java_lang_String::create_from_platform_dependent_str(message, thread); 373 } 374 if (thread->has_pending_exception()) { 375 Handle exception(thread, thread->pending_exception()); 376 thread->clear_pending_exception(); 377 return exception; 378 } 379 if (incoming_exception.not_null()) { 380 return incoming_exception; 381 } 382 args.push_oop(msg); 383 signature = vmSymbols::string_void_signature(); 384 } 385 return new_exception(thread, name, signature, &args, h_cause, h_loader, h_protection_domain); 386 } 387 388 // Another convenience method that creates handles for null class loaders and 389 // protection domains and null causes. 390 // If the last parameter 'to_utf8_mode' is safe_to_utf8, 391 // it means we can safely ignore the encoding scheme of the message string and 392 // convert it directly to a java UTF8 string. Otherwise, we need to take the 393 // encoding scheme of the string into account. One thing we should do at some 394 // point is to push this flag down to class java_lang_String since other 395 // classes may need similar functionalities. 396 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 397 const char* message, 398 ExceptionMsgToUtf8Mode to_utf8_safe) { 399 400 Handle h_loader(thread, NULL); 401 Handle h_prot(thread, NULL); 402 Handle h_cause(thread, NULL); 403 return Exceptions::new_exception(thread, name, message, h_cause, h_loader, 404 h_prot, to_utf8_safe); 405 } 406 407 // Implementation of ExceptionMark 408 409 ExceptionMark::ExceptionMark(Thread*& thread) { 410 thread = Thread::current(); 411 _thread = thread; 412 if (_thread->has_pending_exception()) { 413 oop exception = _thread->pending_exception(); 414 _thread->clear_pending_exception(); // Needed to avoid infinite recursion 415 exception->print(); 416 fatal("ExceptionMark constructor expects no pending exceptions"); 417 } 418 } 419 420 421 ExceptionMark::~ExceptionMark() { 422 if (_thread->has_pending_exception()) { 423 Handle exception(_thread, _thread->pending_exception()); 424 _thread->clear_pending_exception(); // Needed to avoid infinite recursion 425 if (is_init_completed()) { 426 exception->print(); 427 fatal("ExceptionMark destructor expects no pending exceptions"); 428 } else { 429 vm_exit_during_initialization(exception); 430 } 431 } 432 } 433 434 // ---------------------------------------------------------------------------------------- 435 436 #ifndef PRODUCT 437 // caller frees value_string if necessary 438 void Exceptions::debug_check_abort(const char *value_string, const char* message) { 439 if (AbortVMOnException != NULL && value_string != NULL && 440 strstr(value_string, AbortVMOnException)) { 441 if (AbortVMOnExceptionMessage == NULL || message == NULL || 442 strcmp(message, AbortVMOnExceptionMessage) == 0) { 443 fatal(err_msg("Saw %s, aborting", value_string)); 444 } 445 } 446 } 447 448 void Exceptions::debug_check_abort(Handle exception, const char* message) { 449 if (AbortVMOnException != NULL) { 450 ResourceMark rm; 451 if (message == NULL && exception->is_a(SystemDictionary::Throwable_klass())) { 452 oop msg = java_lang_Throwable::message(exception); 453 if (msg != NULL) { 454 message = java_lang_String::as_utf8_string(msg); 455 } 456 } 457 debug_check_abort(InstanceKlass::cast(exception()->klass())->external_name(), message); 458 } 459 } 460 #endif