exceptions.cpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1998, 2007, 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 "incls/_precompiled.incl" 26#include "incls/_exceptions.cpp.incl" 27 28 29// Implementation of ThreadShadow 30void check_ThreadShadow() { 31 const ByteSize offset1 = byte_offset_of(ThreadShadow, _pending_exception); 32 const ByteSize offset2 = Thread::pending_exception_offset(); 33 if (offset1 != offset2) fatal("ThreadShadow::_pending_exception is not positioned correctly"); 34} 35 36 37void ThreadShadow::set_pending_exception(oop exception, const char* file, int line) { 38 assert(exception != NULL && exception->is_oop(), "invalid exception oop"); 39 _pending_exception = exception; 40 _exception_file = file; 41 _exception_line = line; 42} 43 44void ThreadShadow::clear_pending_exception() { 45 if (TraceClearedExceptions) { 46 if (_pending_exception != NULL) { 47 tty->print_cr("Thread::clear_pending_exception: cleared exception:"); 48 _pending_exception->print(); 49 } 50 } 51 _pending_exception = NULL; 52 _exception_file = NULL; 53 _exception_line = 0; 54} 55// Implementation of Exceptions 56 57bool Exceptions::special_exception(Thread* thread, const char* file, int line, Handle h_exception) { 58 // bootstrapping check 59 if (!Universe::is_fully_initialized()) { 60 vm_exit_during_initialization(h_exception); 61 ShouldNotReachHere(); 62 } 63 64 if (thread->is_VM_thread() 65 || thread->is_Compiler_thread() ) { 66 // We do not care what kind of exception we get for the vm-thread or a thread which 67 // is compiling. We just install a dummy exception object 68 thread->set_pending_exception(Universe::vm_exception(), file, line); 69 return true; 70 } 71 72 return false; 73} 74 75bool Exceptions::special_exception(Thread* thread, const char* file, int line, symbolHandle h_name, const char* message) { 76 // bootstrapping check 77 if (!Universe::is_fully_initialized()) { 78 if (h_name.is_null()) { 79 // atleast an informative message. 80 vm_exit_during_initialization("Exception", message); 81 } else { 82 vm_exit_during_initialization(h_name, message); 83 } 84 ShouldNotReachHere(); 85 } 86 87 if (thread->is_VM_thread() 88 || thread->is_Compiler_thread() ) { 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 thread->set_pending_exception(Universe::vm_exception(), file, line); 92 return true; 93 } 94 95 return false; 96} 97 98// This method should only be called from generated code, 99// therefore the exception oop should be in the oopmap. 100void Exceptions::_throw_oop(Thread* thread, const char* file, int line, oop exception) { 101 assert(exception != NULL, "exception should not be NULL"); 102 Handle h_exception = Handle(thread, exception); 103 _throw(thread, file, line, h_exception); 104} 105 106void Exceptions::_throw(Thread* thread, const char* file, int line, Handle h_exception, const char* message) { 107 assert(h_exception() != NULL, "exception should not be NULL"); 108 109 // tracing (do this up front - so it works during boot strapping) 110 if (TraceExceptions) { 111 ttyLocker ttyl; 112 ResourceMark rm; 113 tty->print_cr("Exception <%s>%s%s (" INTPTR_FORMAT " ) \n" 114 "thrown [%s, line %d]\nfor thread " INTPTR_FORMAT, 115 h_exception->print_value_string(), 116 message ? ": " : "", message ? message : "", 117 (address)h_exception(), file, line, thread); 118 } 119 // for AbortVMOnException flag 120 NOT_PRODUCT(Exceptions::debug_check_abort(h_exception)); 121 122 // Check for special boot-strapping/vm-thread handling 123 if (special_exception(thread, file, line, h_exception)) return; 124 125 assert(h_exception->is_a(SystemDictionary::Throwable_klass()), "exception is not a subclass of java/lang/Throwable"); 126 127 // set the pending exception 128 thread->set_pending_exception(h_exception(), file, line); 129 130 // vm log 131 Events::log("throw_exception " INTPTR_FORMAT, (address)h_exception()); 132} 133 134 135void Exceptions::_throw_msg(Thread* thread, const char* file, int line, symbolHandle h_name, const char* message, Handle h_loader, Handle h_protection_domain) { 136 // Check for special boot-strapping/vm-thread handling 137 if (special_exception(thread, file, line, h_name, message)) return; 138 // Create and throw exception 139 Handle h_cause(thread, NULL); 140 Handle h_exception = new_exception(thread, h_name, message, h_cause, h_loader, h_protection_domain); 141 _throw(thread, file, line, h_exception, message); 142} 143 144// Throw an exception with a message and a cause 145void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, symbolHandle h_name, const char* message, Handle h_cause, Handle h_loader, Handle h_protection_domain) { 146 // Check for special boot-strapping/vm-thread handling 147 if (special_exception(thread, file, line, h_name, message)) return; 148 // Create and throw exception and init cause 149 Handle h_exception = new_exception(thread, h_name, message, h_cause, h_loader, h_protection_domain); 150 _throw(thread, file, line, h_exception, message); 151} 152 153// This version creates handles and calls the other version 154void Exceptions::_throw_msg(Thread* thread, const char* file, int line, 155 symbolOop name, const char* message) { 156 symbolHandle h_name(thread, name); 157 Handle h_loader(thread, NULL); 158 Handle h_protection_domain(thread, NULL); 159 Exceptions::_throw_msg(thread, file, line, h_name, message, h_loader, h_protection_domain); 160} 161 162// This version already has a handle for name 163void Exceptions::_throw_msg(Thread* thread, const char* file, int line, 164 symbolHandle name, const char* message) { 165 Handle h_loader(thread, NULL); 166 Handle h_protection_domain(thread, NULL); 167 Exceptions::_throw_msg(thread, file, line, name, message, h_loader, h_protection_domain); 168} 169 170// This version already has a handle for name 171void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, 172 symbolHandle name, const char* message, Handle cause) { 173 Handle h_loader(thread, NULL); 174 Handle h_protection_domain(thread, NULL); 175 Exceptions::_throw_msg_cause(thread, file, line, name, message, cause, h_loader, h_protection_domain); 176} 177 178void Exceptions::_throw_args(Thread* thread, const char* file, int line, symbolHandle h_name, symbolHandle h_signature, JavaCallArguments *args) { 179 // Check for special boot-strapping/vm-thread handling 180 if (special_exception(thread, file, line, h_name, NULL)) return; 181 // Create and throw exception 182 Handle h_loader(thread, NULL); 183 Handle h_prot(thread, NULL); 184 Handle h_cause(thread, NULL); 185 Handle exception = new_exception(thread, h_name, h_signature, args, h_cause, h_loader, h_prot); 186 _throw(thread, file, line, exception); 187} 188 189 190void Exceptions::throw_stack_overflow_exception(Thread* THREAD, const char* file, int line) { 191 Handle exception; 192 if (!THREAD->has_pending_exception()) { 193 klassOop k = SystemDictionary::StackOverflowError_klass(); 194 oop e = instanceKlass::cast(k)->allocate_instance(CHECK); 195 exception = Handle(THREAD, e); // fill_in_stack trace does gc 196 if (StackTraceInThrowable) { 197 java_lang_Throwable::fill_in_stack_trace(exception); 198 } 199 } else { 200 // if prior exception, throw that one instead 201 exception = Handle(THREAD, THREAD->pending_exception()); 202 } 203 _throw_oop(THREAD, file, line, exception()); 204} 205 206void Exceptions::fthrow(Thread* thread, const char* file, int line, symbolHandle h_name, const char* format, ...) { 207 const int max_msg_size = 1024; 208 va_list ap; 209 va_start(ap, format); 210 char msg[max_msg_size]; 211 vsnprintf(msg, max_msg_size, format, ap); 212 msg[max_msg_size-1] = '\0'; 213 va_end(ap); 214 _throw_msg(thread, file, line, h_name, msg); 215} 216 217// Creates an exception oop, calls the <init> method with the given signature. 218// and returns a Handle 219// Initializes the cause if cause non-null 220Handle Exceptions::new_exception(Thread *thread, symbolHandle h_name, 221 symbolHandle signature, 222 JavaCallArguments *args, 223 Handle h_cause, Handle h_loader, 224 Handle h_protection_domain) { 225 assert(Universe::is_fully_initialized(), 226 "cannot be called during initialization"); 227 assert(thread->is_Java_thread(), "can only be called by a Java thread"); 228 assert(!thread->has_pending_exception(), "already has exception"); 229 230 Handle h_exception; 231 232 // Resolve exception klass 233 klassOop ik = SystemDictionary::resolve_or_fail(h_name, h_loader, h_protection_domain, true, thread); 234 instanceKlassHandle klass (thread, ik); 235 236 if (!thread->has_pending_exception()) { 237 assert(klass.not_null(), "klass must exist"); 238 // We are about to create an instance - so make sure that klass is initialized 239 klass->initialize(thread); 240 if (!thread->has_pending_exception()) { 241 // Allocate new exception 242 h_exception = klass->allocate_instance_handle(thread); 243 if (!thread->has_pending_exception()) { 244 JavaValue result(T_VOID); 245 args->set_receiver(h_exception); 246 // Call constructor 247 JavaCalls::call_special(&result, klass, 248 vmSymbolHandles::object_initializer_name(), 249 signature, 250 args, 251 thread); 252 253 } 254 } 255 256 // Future: object initializer should take a cause argument 257 if (h_cause() != NULL) { 258 assert(h_cause->is_a(SystemDictionary::Throwable_klass()), 259 "exception cause is not a subclass of java/lang/Throwable"); 260 JavaValue result1(T_OBJECT); 261 JavaCallArguments args1; 262 args1.set_receiver(h_exception); 263 args1.push_oop(h_cause); 264 JavaCalls::call_virtual(&result1, klass, 265 vmSymbolHandles::initCause_name(), 266 vmSymbolHandles::throwable_throwable_signature(), 267 &args1, 268 thread); 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// Convenience method. Calls either the <init>() or <init>(String) method when 281// creating a new exception 282Handle Exceptions::new_exception(Thread* thread, symbolHandle h_name, 283 const char* message, Handle h_cause, 284 Handle h_loader, 285 Handle h_protection_domain, 286 ExceptionMsgToUtf8Mode to_utf8_safe) { 287 JavaCallArguments args; 288 symbolHandle signature; 289 if (message == NULL) { 290 signature = vmSymbolHandles::void_method_signature(); 291 } else { 292 // We want to allocate storage, but we can't do that if there's 293 // a pending exception, so we preserve any pending exception 294 // around the allocation. 295 // If we get an exception from the allocation, prefer that to 296 // the exception we are trying to build, or the pending exception. 297 // This is sort of like what PRESERVE_EXCEPTION_MARK does, except 298 // for the preferencing and the early returns. 299 Handle incoming_exception (thread, NULL); 300 if (thread->has_pending_exception()) { 301 incoming_exception = Handle(thread, thread->pending_exception()); 302 thread->clear_pending_exception(); 303 } 304 Handle msg; 305 if (to_utf8_safe == safe_to_utf8) { 306 // Make a java UTF8 string. 307 msg = java_lang_String::create_from_str(message, thread); 308 } else { 309 // Make a java string keeping the encoding scheme of the original string. 310 msg = java_lang_String::create_from_platform_dependent_str(message, thread); 311 } 312 if (thread->has_pending_exception()) { 313 Handle exception(thread, thread->pending_exception()); 314 thread->clear_pending_exception(); 315 return exception; 316 } 317 if (incoming_exception.not_null()) { 318 return incoming_exception; 319 } 320 args.push_oop(msg); 321 signature = vmSymbolHandles::string_void_signature(); 322 } 323 return new_exception(thread, h_name, signature, &args, h_cause, h_loader, h_protection_domain); 324} 325 326// Another convenience method that creates handles for null class loaders and 327// protection domains and null causes. 328// If the last parameter 'to_utf8_mode' is safe_to_utf8, 329// it means we can safely ignore the encoding scheme of the message string and 330// convert it directly to a java UTF8 string. Otherwise, we need to take the 331// encoding scheme of the string into account. One thing we should do at some 332// point is to push this flag down to class java_lang_String since other 333// classes may need similar functionalities. 334Handle Exceptions::new_exception(Thread* thread, 335 symbolOop name, 336 const char* message, 337 ExceptionMsgToUtf8Mode to_utf8_safe) { 338 339 symbolHandle h_name(thread, name); 340 Handle h_loader(thread, NULL); 341 Handle h_prot(thread, NULL); 342 Handle h_cause(thread, NULL); 343 return Exceptions::new_exception(thread, h_name, message, h_cause, h_loader, 344 h_prot, to_utf8_safe); 345} 346 347// Implementation of ExceptionMark 348 349ExceptionMark::ExceptionMark(Thread*& thread) { 350 thread = Thread::current(); 351 _thread = thread; 352 if (_thread->has_pending_exception()) { 353 oop exception = _thread->pending_exception(); 354 _thread->clear_pending_exception(); // Needed to avoid infinite recursion 355 exception->print(); 356 fatal("ExceptionMark constructor expects no pending exceptions"); 357 } 358} 359 360 361ExceptionMark::~ExceptionMark() { 362 if (_thread->has_pending_exception()) { 363 Handle exception(_thread, _thread->pending_exception()); 364 _thread->clear_pending_exception(); // Needed to avoid infinite recursion 365 if (is_init_completed()) { 366 exception->print(); 367 fatal("ExceptionMark destructor expects no pending exceptions"); 368 } else { 369 vm_exit_during_initialization(exception); 370 } 371 } 372} 373 374// ---------------------------------------------------------------------------------------- 375 376#ifndef PRODUCT 377// caller frees value_string if necessary 378void Exceptions::debug_check_abort(const char *value_string) { 379 if (AbortVMOnException != NULL && value_string != NULL && 380 strstr(value_string, AbortVMOnException)) { 381 fatal(err_msg("Saw %s, aborting", value_string)); 382 } 383} 384 385void Exceptions::debug_check_abort(Handle exception) { 386 if (AbortVMOnException != NULL) { 387 ResourceMark rm; 388 debug_check_abort(instanceKlass::cast(exception()->klass())->external_name()); 389 } 390} 391#endif 392