1 /* 2 * Copyright (c) 1998, 2012, 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 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->is_Compiler_thread() ) { 88 // We do not care what kind of exception we get for the vm-thread or a thread which 89 // is compiling. We just install a dummy exception object 90 thread->set_pending_exception(Universe::vm_exception(), file, line); 91 return true; 92 } 93 94 return false; 95 } 96 97 bool Exceptions::special_exception(Thread* thread, const char* file, int line, Symbol* h_name, const char* message) { 98 // bootstrapping check 99 if (!Universe::is_fully_initialized()) { 100 if (h_name == NULL) { 101 // atleast an informative message. 102 vm_exit_during_initialization("Exception", message); 103 } else { 104 vm_exit_during_initialization(h_name, message); 105 } 106 ShouldNotReachHere(); 107 } 108 109 if (thread->is_VM_thread() 110 || thread->is_Compiler_thread() ) { 111 // We do not care what kind of exception we get for the vm-thread or a thread which 112 // is compiling. We just install a dummy exception object 113 thread->set_pending_exception(Universe::vm_exception(), file, line); 114 return true; 115 } 116 return false; 117 } 118 119 // This method should only be called from generated code, 120 // therefore the exception oop should be in the oopmap. 121 void Exceptions::_throw_oop(Thread* thread, const char* file, int line, oop exception) { 122 assert(exception != NULL, "exception should not be NULL"); 123 Handle h_exception = Handle(thread, exception); 124 _throw(thread, file, line, h_exception); 125 } 126 127 void Exceptions::_throw(Thread* thread, const char* file, int line, Handle h_exception, const char* message) { 128 assert(h_exception() != NULL, "exception should not be NULL"); 129 130 // tracing (do this up front - so it works during boot strapping) 131 if (TraceExceptions) { 132 ttyLocker ttyl; 133 ResourceMark rm; 134 tty->print_cr("Exception <%s>%s%s (" INTPTR_FORMAT " ) \n" 135 "thrown [%s, line %d]\nfor thread " INTPTR_FORMAT, 136 h_exception->print_value_string(), 137 message ? ": " : "", message ? message : "", 138 (address)h_exception(), file, line, thread); 139 } 140 // for AbortVMOnException flag 141 NOT_PRODUCT(Exceptions::debug_check_abort(h_exception, message)); 142 143 // Check for special boot-strapping/vm-thread handling 144 if (special_exception(thread, file, line, h_exception)) return; 145 146 assert(h_exception->is_a(SystemDictionary::Throwable_klass()), "exception is not a subclass of java/lang/Throwable"); 147 148 // set the pending exception 149 thread->set_pending_exception(h_exception(), file, line); 150 151 // vm log 152 Events::log_exception(thread, "Threw " INTPTR_FORMAT " at %s:%d", (address)h_exception(), file, line); 153 } 154 155 156 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message, 157 Handle h_loader, Handle h_protection_domain) { 158 // Check for special boot-strapping/vm-thread handling 159 if (special_exception(thread, file, line, name, message)) return; 160 // Create and throw exception 161 Handle h_cause(thread, NULL); 162 Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain); 163 _throw(thread, file, line, h_exception, message); 164 } 165 166 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause, 167 Handle h_loader, Handle h_protection_domain) { 168 // Check for special boot-strapping/vm-thread handling 169 if (special_exception(thread, file, line, name, message)) return; 170 // Create and throw exception and init cause 171 Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain); 172 _throw(thread, file, line, h_exception, message); 173 } 174 175 void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause, 176 Handle h_loader, Handle h_protection_domain) { 177 // Check for special boot-strapping/vm-thread handling 178 if (special_exception(thread, file, line, h_cause)) return; 179 // Create and throw exception 180 Handle h_exception = new_exception(thread, name, h_cause, h_loader, h_protection_domain); 181 _throw(thread, file, line, h_exception, NULL); 182 } 183 184 void Exceptions::_throw_args(Thread* thread, const char* file, int line, Symbol* name, Symbol* signature, JavaCallArguments *args) { 185 // Check for special boot-strapping/vm-thread handling 186 if (special_exception(thread, file, line, name, NULL)) return; 187 // Create and throw exception 188 Handle h_loader(thread, NULL); 189 Handle h_prot(thread, NULL); 190 Handle exception = new_exception(thread, name, signature, args, h_loader, h_prot); 191 _throw(thread, file, line, exception); 192 } 193 194 195 // Methods for default parameters. 196 // NOTE: These must be here (and not in the header file) because of include circularities. 197 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause) { 198 _throw_msg_cause(thread, file, line, name, message, h_cause, Handle(thread, NULL), Handle(thread, NULL)); 199 } 200 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message) { 201 _throw_msg(thread, file, line, name, message, Handle(thread, NULL), Handle(thread, NULL)); 202 } 203 void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause) { 204 _throw_cause(thread, file, line, name, h_cause, Handle(thread, NULL), Handle(thread, NULL)); 205 } 206 207 208 void Exceptions::throw_stack_overflow_exception(Thread* THREAD, const char* file, int line, methodHandle method) { 209 Handle exception; 210 if (!THREAD->has_pending_exception()) { 211 Klass* k = SystemDictionary::StackOverflowError_klass(); 212 oop e = InstanceKlass::cast(k)->allocate_instance(CHECK); 213 exception = Handle(THREAD, e); // fill_in_stack trace does gc 214 assert(InstanceKlass::cast(k)->is_initialized(), "need to increase min_stack_allowed calculation"); 215 if (StackTraceInThrowable) { 216 java_lang_Throwable::fill_in_stack_trace(exception, method()); 217 } 218 } else { 219 // if prior exception, throw that one instead 220 exception = Handle(THREAD, THREAD->pending_exception()); 221 } 222 _throw(THREAD, file, line, exception); 223 } 224 225 void Exceptions::fthrow(Thread* thread, const char* file, int line, Symbol* h_name, const char* format, ...) { 226 const int max_msg_size = 1024; 227 va_list ap; 228 va_start(ap, format); 229 char msg[max_msg_size]; 230 vsnprintf(msg, max_msg_size, format, ap); 231 msg[max_msg_size-1] = '\0'; 232 va_end(ap); 233 _throw_msg(thread, file, line, h_name, msg); 234 } 235 236 // Creates an exception oop, calls the <init> method with the given signature. 237 // and returns a Handle 238 Handle Exceptions::new_exception(Thread *thread, Symbol* name, 239 Symbol* signature, JavaCallArguments *args, 240 Handle h_loader, Handle h_protection_domain) { 241 assert(Universe::is_fully_initialized(), 242 "cannot be called during initialization"); 243 assert(thread->is_Java_thread(), "can only be called by a Java thread"); 244 assert(!thread->has_pending_exception(), "already has exception"); 245 246 Handle h_exception; 247 248 // Resolve exception klass 249 Klass* ik = SystemDictionary::resolve_or_fail(name, h_loader, h_protection_domain, true, thread); 250 instanceKlassHandle klass(thread, ik); 251 252 if (!thread->has_pending_exception()) { 253 assert(klass.not_null(), "klass must exist"); 254 // We are about to create an instance - so make sure that klass is initialized 255 klass->initialize(thread); 256 if (!thread->has_pending_exception()) { 257 // Allocate new exception 258 h_exception = klass->allocate_instance_handle(thread); 259 if (!thread->has_pending_exception()) { 260 JavaValue result(T_VOID); 261 args->set_receiver(h_exception); 262 // Call constructor 263 JavaCalls::call_special(&result, klass, 264 vmSymbols::object_initializer_name(), 265 signature, 266 args, 267 thread); 268 } 269 } 270 } 271 272 // Check if another exception was thrown in the process, if so rethrow that one 273 if (thread->has_pending_exception()) { 274 h_exception = Handle(thread, thread->pending_exception()); 275 thread->clear_pending_exception(); 276 } 277 return h_exception; 278 } 279 280 // Creates an exception oop, calls the <init> method with the given signature. 281 // and returns a Handle 282 // Initializes the cause if cause non-null 283 Handle Exceptions::new_exception(Thread *thread, Symbol* name, 284 Symbol* signature, JavaCallArguments *args, 285 Handle h_cause, 286 Handle h_loader, Handle h_protection_domain) { 287 Handle h_exception = new_exception(thread, name, signature, args, h_loader, h_protection_domain); 288 289 // Future: object initializer should take a cause argument 290 if (h_cause.not_null()) { 291 assert(h_cause->is_a(SystemDictionary::Throwable_klass()), 292 "exception cause is not a subclass of java/lang/Throwable"); 293 JavaValue result1(T_OBJECT); 294 JavaCallArguments args1; 295 args1.set_receiver(h_exception); 296 args1.push_oop(h_cause); 297 JavaCalls::call_virtual(&result1, h_exception->klass(), 298 vmSymbols::initCause_name(), 299 vmSymbols::throwable_throwable_signature(), 300 &args1, 301 thread); 302 } 303 304 // Check if another exception was thrown in the process, if so rethrow that one 305 if (thread->has_pending_exception()) { 306 h_exception = Handle(thread, thread->pending_exception()); 307 thread->clear_pending_exception(); 308 } 309 return h_exception; 310 } 311 312 // Convenience method. Calls either the <init>() or <init>(Throwable) method when 313 // creating a new exception 314 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 315 Handle h_cause, 316 Handle h_loader, Handle h_protection_domain, 317 ExceptionMsgToUtf8Mode to_utf8_safe) { 318 JavaCallArguments args; 319 Symbol* signature = NULL; 320 if (h_cause.is_null()) { 321 signature = vmSymbols::void_method_signature(); 322 } else { 323 signature = vmSymbols::throwable_void_signature(); 324 args.push_oop(h_cause); 325 } 326 return new_exception(thread, name, signature, &args, h_loader, h_protection_domain); 327 } 328 329 // Convenience method. Calls either the <init>() or <init>(String) method when 330 // creating a new exception 331 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 332 const char* message, Handle h_cause, 333 Handle h_loader, Handle h_protection_domain, 334 ExceptionMsgToUtf8Mode to_utf8_safe) { 335 JavaCallArguments args; 336 Symbol* signature = NULL; 337 if (message == NULL) { 338 signature = vmSymbols::void_method_signature(); 339 } else { 340 // We want to allocate storage, but we can't do that if there's 341 // a pending exception, so we preserve any pending exception 342 // around the allocation. 343 // If we get an exception from the allocation, prefer that to 344 // the exception we are trying to build, or the pending exception. 345 // This is sort of like what PRESERVE_EXCEPTION_MARK does, except 346 // for the preferencing and the early returns. 347 Handle incoming_exception(thread, NULL); 348 if (thread->has_pending_exception()) { 349 incoming_exception = Handle(thread, thread->pending_exception()); 350 thread->clear_pending_exception(); 351 } 352 Handle msg; 353 if (to_utf8_safe == safe_to_utf8) { 354 // Make a java UTF8 string. 355 msg = java_lang_String::create_from_str(message, thread); 356 } else { 357 // Make a java string keeping the encoding scheme of the original string. 358 msg = java_lang_String::create_from_platform_dependent_str(message, thread); 359 } 360 if (thread->has_pending_exception()) { 361 Handle exception(thread, thread->pending_exception()); 362 thread->clear_pending_exception(); 363 return exception; 364 } 365 if (incoming_exception.not_null()) { 366 return incoming_exception; 367 } 368 args.push_oop(msg); 369 signature = vmSymbols::string_void_signature(); 370 } 371 return new_exception(thread, name, signature, &args, h_cause, h_loader, h_protection_domain); 372 } 373 374 // Another convenience method that creates handles for null class loaders and 375 // protection domains and null causes. 376 // If the last parameter 'to_utf8_mode' is safe_to_utf8, 377 // it means we can safely ignore the encoding scheme of the message string and 378 // convert it directly to a java UTF8 string. Otherwise, we need to take the 379 // encoding scheme of the string into account. One thing we should do at some 380 // point is to push this flag down to class java_lang_String since other 381 // classes may need similar functionalities. 382 Handle Exceptions::new_exception(Thread* thread, Symbol* name, 383 const char* message, 384 ExceptionMsgToUtf8Mode to_utf8_safe) { 385 386 Handle h_loader(thread, NULL); 387 Handle h_prot(thread, NULL); 388 Handle h_cause(thread, NULL); 389 return Exceptions::new_exception(thread, name, message, h_cause, h_loader, 390 h_prot, to_utf8_safe); 391 } 392 393 // Implementation of ExceptionMark 394 395 ExceptionMark::ExceptionMark(Thread*& thread) { 396 thread = Thread::current(); 397 _thread = thread; 398 if (_thread->has_pending_exception()) { 399 oop exception = _thread->pending_exception(); 400 _thread->clear_pending_exception(); // Needed to avoid infinite recursion 401 exception->print(); 402 fatal("ExceptionMark constructor expects no pending exceptions"); 403 } 404 } 405 406 407 ExceptionMark::~ExceptionMark() { 408 if (_thread->has_pending_exception()) { 409 Handle exception(_thread, _thread->pending_exception()); 410 _thread->clear_pending_exception(); // Needed to avoid infinite recursion 411 if (is_init_completed()) { 412 exception->print(); 413 fatal("ExceptionMark destructor expects no pending exceptions"); 414 } else { 415 vm_exit_during_initialization(exception); 416 } 417 } 418 } 419 420 // ---------------------------------------------------------------------------------------- 421 422 #ifndef PRODUCT 423 // caller frees value_string if necessary 424 void Exceptions::debug_check_abort(const char *value_string, const char* message) { 425 if (AbortVMOnException != NULL && value_string != NULL && 426 strstr(value_string, AbortVMOnException)) { 427 if (AbortVMOnExceptionMessage == NULL || message == NULL || 428 strcmp(message, AbortVMOnExceptionMessage) == 0) { 429 fatal(err_msg("Saw %s, aborting", value_string)); 430 } 431 } 432 } 433 434 void Exceptions::debug_check_abort(Handle exception, const char* message) { 435 if (AbortVMOnException != NULL) { 436 ResourceMark rm; 437 if (message == NULL && exception->is_a(SystemDictionary::Throwable_klass())) { 438 oop msg = java_lang_Throwable::message(exception); 439 if (msg != NULL) { 440 message = java_lang_String::as_utf8_string(msg); 441 } 442 } 443 debug_check_abort(InstanceKlass::cast(exception()->klass())->external_name(), message); 444 } 445 } 446 #endif