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comparison src/share/vm/utilities/exceptions.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1998-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_exceptions.cpp.incl"
27
28
29 // Implementation of ThreadShadow
30 void 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
37 void 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
44 void 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
57 bool 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
75 bool 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.
100 void 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
106 void Exceptions::_throw(Thread* thread, const char* file, int line, Handle h_exception) {
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> (" INTPTR_FORMAT " ) \nthrown [%s, line %d]\nfor thread " INTPTR_FORMAT,
114 h_exception->print_value_string(), (address)h_exception(), file, line, thread);
115 }
116 // for AbortVMOnException flag
117 NOT_PRODUCT(Exceptions::debug_check_abort(h_exception));
118
119 // Check for special boot-strapping/vm-thread handling
120 if (special_exception(thread, file, line, h_exception)) return;
121
122 assert(h_exception->is_a(SystemDictionary::throwable_klass()), "exception is not a subclass of java/lang/Throwable");
123
124 // set the pending exception
125 thread->set_pending_exception(h_exception(), file, line);
126
127 // vm log
128 Events::log("throw_exception " INTPTR_FORMAT, (address)h_exception());
129 }
130
131
132 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, symbolHandle h_name, const char* message, Handle h_loader, Handle h_protection_domain) {
133 // Check for special boot-strapping/vm-thread handling
134 if (special_exception(thread, file, line, h_name, message)) return;
135 // Create and throw exception
136 Handle h_cause(thread, NULL);
137 Handle h_exception = new_exception(thread, h_name, message, h_cause, h_loader, h_protection_domain);
138 _throw(thread, file, line, h_exception);
139 }
140
141 // Throw an exception with a message and a cause
142 void 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) {
143 // Check for special boot-strapping/vm-thread handling
144 if (special_exception(thread, file, line, h_name, message)) return;
145 // Create and throw exception and init cause
146 Handle h_exception = new_exception(thread, h_name, message, h_cause, h_loader, h_protection_domain);
147 _throw(thread, file, line, h_exception);
148 }
149
150 // This version creates handles and calls the other version
151 void Exceptions::_throw_msg(Thread* thread, const char* file, int line,
152 symbolOop name, const char* message) {
153 symbolHandle h_name(thread, name);
154 Handle h_loader(thread, NULL);
155 Handle h_protection_domain(thread, NULL);
156 Exceptions::_throw_msg(thread, file, line, h_name, message, h_loader, h_protection_domain);
157 }
158
159 // This version already has a handle for name
160 void Exceptions::_throw_msg(Thread* thread, const char* file, int line,
161 symbolHandle name, const char* message) {
162 Handle h_loader(thread, NULL);
163 Handle h_protection_domain(thread, NULL);
164 Exceptions::_throw_msg(thread, file, line, name, message, h_loader, h_protection_domain);
165 }
166
167 // This version already has a handle for name
168 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line,
169 symbolHandle name, const char* message, Handle cause) {
170 Handle h_loader(thread, NULL);
171 Handle h_protection_domain(thread, NULL);
172 Exceptions::_throw_msg_cause(thread, file, line, name, message, cause, h_loader, h_protection_domain);
173 }
174
175 void Exceptions::_throw_args(Thread* thread, const char* file, int line, symbolHandle h_name, symbolHandle h_signature, JavaCallArguments *args) {
176 // Check for special boot-strapping/vm-thread handling
177 if (special_exception(thread, file, line, h_name, NULL)) return;
178 // Create and throw exception
179 Handle h_loader(thread, NULL);
180 Handle h_prot(thread, NULL);
181 Handle h_cause(thread, NULL);
182 Handle exception = new_exception(thread, h_name, h_signature, args, h_cause, h_loader, h_prot);
183 _throw(thread, file, line, exception);
184 }
185
186
187 void Exceptions::throw_stack_overflow_exception(Thread* THREAD, const char* file, int line) {
188 Handle exception;
189 if (!THREAD->has_pending_exception()) {
190 klassOop k = SystemDictionary::StackOverflowError_klass();
191 oop e = instanceKlass::cast(k)->allocate_instance(CHECK);
192 exception = Handle(THREAD, e); // fill_in_stack trace does gc
193 if (StackTraceInThrowable) {
194 java_lang_Throwable::fill_in_stack_trace(exception);
195 }
196 } else {
197 // if prior exception, throw that one instead
198 exception = Handle(THREAD, THREAD->pending_exception());
199 }
200 _throw_oop(THREAD, file, line, exception());
201 }
202
203 void Exceptions::fthrow(Thread* thread, const char* file, int line, symbolHandle h_name, const char* format, ...) {
204 const int max_msg_size = 1024;
205 va_list ap;
206 va_start(ap, format);
207 char msg[max_msg_size];
208 vsnprintf(msg, max_msg_size, format, ap);
209 msg[max_msg_size-1] = '\0';
210 va_end(ap);
211 _throw_msg(thread, file, line, h_name, msg);
212 }
213
214 // Creates an exception oop, calls the <init> method with the given signature.
215 // and returns a Handle
216 // Initializes the cause if cause non-null
217 Handle Exceptions::new_exception(Thread *thread, symbolHandle h_name,
218 symbolHandle signature,
219 JavaCallArguments *args,
220 Handle h_cause, Handle h_loader,
221 Handle h_protection_domain) {
222 assert(Universe::is_fully_initialized(),
223 "cannot be called during initialization");
224 assert(thread->is_Java_thread(), "can only be called by a Java thread");
225 assert(!thread->has_pending_exception(), "already has exception");
226
227 Handle h_exception;
228
229 // Resolve exception klass
230 klassOop ik = SystemDictionary::resolve_or_fail(h_name, h_loader, h_protection_domain, true, thread);
231 instanceKlassHandle klass (thread, ik);
232
233 if (!thread->has_pending_exception()) {
234 assert(klass.not_null(), "klass must exist");
235 // We are about to create an instance - so make sure that klass is initialized
236 klass->initialize(thread);
237 if (!thread->has_pending_exception()) {
238 // Allocate new exception
239 h_exception = klass->allocate_instance_handle(thread);
240 if (!thread->has_pending_exception()) {
241 JavaValue result(T_VOID);
242 args->set_receiver(h_exception);
243 // Call constructor
244 JavaCalls::call_special(&result, klass,
245 vmSymbolHandles::object_initializer_name(),
246 signature,
247 args,
248 thread);
249
250 }
251 }
252
253 // Future: object initializer should take a cause argument
254 if (h_cause() != NULL) {
255 assert(h_cause->is_a(SystemDictionary::throwable_klass()),
256 "exception cause is not a subclass of java/lang/Throwable");
257 JavaValue result1(T_OBJECT);
258 JavaCallArguments args1;
259 args1.set_receiver(h_exception);
260 args1.push_oop(h_cause);
261 JavaCalls::call_virtual(&result1, klass,
262 vmSymbolHandles::initCause_name(),
263 vmSymbolHandles::throwable_throwable_signature(),
264 &args1,
265 thread);
266 }
267 }
268
269 // Check if another exception was thrown in the process, if so rethrow that one
270 if (thread->has_pending_exception()) {
271 h_exception = Handle(thread, thread->pending_exception());
272 thread->clear_pending_exception();
273 }
274 return h_exception;
275 }
276
277 // Convenience method. Calls either the <init>() or <init>(String) method when
278 // creating a new exception
279 Handle Exceptions::new_exception(Thread* thread, symbolHandle h_name,
280 const char* message, Handle h_cause,
281 Handle h_loader,
282 Handle h_protection_domain,
283 ExceptionMsgToUtf8Mode to_utf8_safe) {
284 JavaCallArguments args;
285 symbolHandle signature;
286 if (message == NULL) {
287 signature = vmSymbolHandles::void_method_signature();
288 } else {
289 // We want to allocate storage, but we can't do that if there's
290 // a pending exception, so we preserve any pending exception
291 // around the allocation.
292 // If we get an exception from the allocation, prefer that to
293 // the exception we are trying to build, or the pending exception.
294 // This is sort of like what PRESERVE_EXCEPTION_MARK does, except
295 // for the preferencing and the early returns.
296 Handle incoming_exception (thread, NULL);
297 if (thread->has_pending_exception()) {
298 incoming_exception = Handle(thread, thread->pending_exception());
299 thread->clear_pending_exception();
300 }
301 Handle msg;
302 if (to_utf8_safe == safe_to_utf8) {
303 // Make a java UTF8 string.
304 msg = java_lang_String::create_from_str(message, thread);
305 } else {
306 // Make a java string keeping the encoding scheme of the original string.
307 msg = java_lang_String::create_from_platform_dependent_str(message, thread);
308 }
309 if (thread->has_pending_exception()) {
310 Handle exception(thread, thread->pending_exception());
311 thread->clear_pending_exception();
312 return exception;
313 }
314 if (incoming_exception.not_null()) {
315 return incoming_exception;
316 }
317 args.push_oop(msg);
318 signature = vmSymbolHandles::string_void_signature();
319 }
320 return new_exception(thread, h_name, signature, &args, h_cause, h_loader, h_protection_domain);
321 }
322
323 // Another convenience method that creates handles for null class loaders and
324 // protection domains and null causes.
325 // If the last parameter 'to_utf8_mode' is safe_to_utf8,
326 // it means we can safely ignore the encoding scheme of the message string and
327 // convert it directly to a java UTF8 string. Otherwise, we need to take the
328 // encoding scheme of the string into account. One thing we should do at some
329 // point is to push this flag down to class java_lang_String since other
330 // classes may need similar functionalities.
331 Handle Exceptions::new_exception(Thread* thread,
332 symbolOop name,
333 const char* message,
334 ExceptionMsgToUtf8Mode to_utf8_safe) {
335
336 symbolHandle h_name(thread, name);
337 Handle h_loader(thread, NULL);
338 Handle h_prot(thread, NULL);
339 Handle h_cause(thread, NULL);
340 return Exceptions::new_exception(thread, h_name, message, h_cause, h_loader,
341 h_prot, to_utf8_safe);
342 }
343
344 // Implementation of ExceptionMark
345
346 ExceptionMark::ExceptionMark(Thread*& thread) {
347 thread = Thread::current();
348 _thread = thread;
349 if (_thread->has_pending_exception()) {
350 oop exception = _thread->pending_exception();
351 _thread->clear_pending_exception(); // Needed to avoid infinite recursion
352 exception->print();
353 fatal("ExceptionMark constructor expects no pending exceptions");
354 }
355 }
356
357
358 ExceptionMark::~ExceptionMark() {
359 if (_thread->has_pending_exception()) {
360 Handle exception(_thread, _thread->pending_exception());
361 _thread->clear_pending_exception(); // Needed to avoid infinite recursion
362 if (is_init_completed()) {
363 exception->print();
364 fatal("ExceptionMark destructor expects no pending exceptions");
365 } else {
366 vm_exit_during_initialization(exception);
367 }
368 }
369 }
370
371 // ----------------------------------------------------------------------------------------
372
373 #ifndef PRODUCT
374 // caller frees value_string if necessary
375 void Exceptions::debug_check_abort(const char *value_string) {
376 if (AbortVMOnException != NULL && value_string != NULL &&
377 strstr(value_string, AbortVMOnException)) {
378 fatal1("Saw %s, aborting", value_string);
379 }
380 }
381
382 void Exceptions::debug_check_abort(Handle exception) {
383 if (AbortVMOnException != NULL) {
384 ResourceMark rm;
385 debug_check_abort(instanceKlass::cast(exception()->klass())->external_name());
386 }
387 }
388 #endif