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comparison: src/share/vm/utilities/exceptions.cpp

src/share/vm/utilities/exceptions.cpp

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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 // 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 bool Exceptions::special_exception(Thread* thread, const char* file, int line, Symbol* h_name, const char* message) {
99 // bootstrapping check
100 if (!Universe::is_fully_initialized()) {
101 if (h_name == NULL) {
102 // atleast an informative message.
103 vm_exit_during_initialization("Exception", message);
104 } else {
105 vm_exit_during_initialization(h_name, message);
106 }
107 ShouldNotReachHere();
108 }
109
110 if (thread->is_VM_thread()
111 || thread->is_Compiler_thread() ) {
112 // We do not care what kind of exception we get for the vm-thread or a thread which
113 // is compiling. We just install a dummy exception object
114 thread->set_pending_exception(Universe::vm_exception(), file, line);
115 return true;
116 }
117 return false;
118 }
119
120 // This method should only be called from generated code,
121 // therefore the exception oop should be in the oopmap.
122 void Exceptions::_throw_oop(Thread* thread, const char* file, int line, oop exception) {
123 assert(exception != NULL, "exception should not be NULL");
124 Handle h_exception = Handle(thread, exception);
125 _throw(thread, file, line, h_exception);
126 }
127
128 void Exceptions::_throw(Thread* thread, const char* file, int line, Handle h_exception, const char* message) {
129 ResourceMark rm;
130 assert(h_exception() != NULL, "exception should not be NULL");
131
132 // tracing (do this up front - so it works during boot strapping)
133 if (TraceExceptions) {
134 ttyLocker ttyl;
135 tty->print_cr("Exception <%s%s%s> (" INTPTR_FORMAT ") \n"
136 "thrown [%s, line %d]\nfor thread " INTPTR_FORMAT,
137 h_exception->print_value_string(),
138 message ? ": " : "", message ? message : "",
139 (address)h_exception(), file, line, thread);
140 }
141 // for AbortVMOnException flag
142 NOT_PRODUCT(Exceptions::debug_check_abort(h_exception, message));
143
144 // Check for special boot-strapping/vm-thread handling
145 if (special_exception(thread, file, line, h_exception)) {
146 return;
147 }
148
149 assert(h_exception->is_a(SystemDictionary::Throwable_klass()), "exception is not a subclass of java/lang/Throwable");
150
151 // set the pending exception
152 thread->set_pending_exception(h_exception(), file, line);
153
154 // vm log
155 Events::log_exception(thread, "Exception <%s%s%s> (" INTPTR_FORMAT ") thrown at [%s, line %d]",
156 h_exception->print_value_string(), message ? ": " : "", message ? message : "",
157 (address)h_exception(), file, line);
158 }
159
160
161 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message,
162 Handle h_loader, Handle h_protection_domain) {
163 // Check for special boot-strapping/vm-thread handling
164 if (special_exception(thread, file, line, name, message)) return;
165 // Create and throw exception
166 Handle h_cause(thread, NULL);
167 Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain);
168 _throw(thread, file, line, h_exception, message);
169 }
170
171 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause,
172 Handle h_loader, Handle h_protection_domain) {
173 // Check for special boot-strapping/vm-thread handling
174 if (special_exception(thread, file, line, name, message)) return;
175 // Create and throw exception and init cause
176 Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain);
177 _throw(thread, file, line, h_exception, message);
178 }
179
180 void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause,
181 Handle h_loader, Handle h_protection_domain) {
182 // Check for special boot-strapping/vm-thread handling
183 if (special_exception(thread, file, line, h_cause)) return;
184 // Create and throw exception
185 Handle h_exception = new_exception(thread, name, h_cause, h_loader, h_protection_domain);
186 _throw(thread, file, line, h_exception, NULL);
187 }
188
189 void Exceptions::_throw_args(Thread* thread, const char* file, int line, Symbol* name, Symbol* signature, JavaCallArguments *args) {
190 // Check for special boot-strapping/vm-thread handling
191 if (special_exception(thread, file, line, name, NULL)) return;
192 // Create and throw exception
193 Handle h_loader(thread, NULL);
194 Handle h_prot(thread, NULL);
195 Handle exception = new_exception(thread, name, signature, args, h_loader, h_prot);
196 _throw(thread, file, line, exception);
197 }
198
199
200 // Methods for default parameters.
201 // NOTE: These must be here (and not in the header file) because of include circularities.
202 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause) {
203 _throw_msg_cause(thread, file, line, name, message, h_cause, Handle(thread, NULL), Handle(thread, NULL));
204 }
205 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message) {
206 _throw_msg(thread, file, line, name, message, Handle(thread, NULL), Handle(thread, NULL));
207 }
208 void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause) {
209 _throw_cause(thread, file, line, name, h_cause, Handle(thread, NULL), Handle(thread, NULL));
210 }
211
212
213 void Exceptions::throw_stack_overflow_exception(Thread* THREAD, const char* file, int line, methodHandle method) {
214 Handle exception;
215 if (!THREAD->has_pending_exception()) {
216 Klass* k = SystemDictionary::StackOverflowError_klass();
217 oop e = InstanceKlass::cast(k)->allocate_instance(CHECK);
218 exception = Handle(THREAD, e); // fill_in_stack trace does gc
219 assert(InstanceKlass::cast(k)->is_initialized(), "need to increase min_stack_allowed calculation");
220 if (StackTraceInThrowable) {
221 java_lang_Throwable::fill_in_stack_trace(exception, method());
222 }
223 } else {
224 // if prior exception, throw that one instead
225 exception = Handle(THREAD, THREAD->pending_exception());
226 }
227 _throw(THREAD, file, line, exception);
228 }
229
230 void Exceptions::fthrow(Thread* thread, const char* file, int line, Symbol* h_name, const char* format, ...) {
231 const int max_msg_size = 1024;
232 va_list ap;
233 va_start(ap, format);
234 char msg[max_msg_size];
235 vsnprintf(msg, max_msg_size, format, ap);
236 msg[max_msg_size-1] = '\0';
237 va_end(ap);
238 _throw_msg(thread, file, line, h_name, msg);
239 }
240
241
242 // Creates an exception oop, calls the <init> method with the given signature.
243 // and returns a Handle
244 Handle Exceptions::new_exception(Thread *thread, Symbol* name,
245 Symbol* signature, JavaCallArguments *args,
246 Handle h_loader, Handle h_protection_domain) {
247 assert(Universe::is_fully_initialized(),
248 "cannot be called during initialization");
249 assert(thread->is_Java_thread(), "can only be called by a Java thread");
250 assert(!thread->has_pending_exception(), "already has exception");
251
252 Handle h_exception;
253
254 // Resolve exception klass
255 Klass* ik = SystemDictionary::resolve_or_fail(name, h_loader, h_protection_domain, true, thread);
256 instanceKlassHandle klass(thread, ik);
257
258 if (!thread->has_pending_exception()) {
259 assert(klass.not_null(), "klass must exist");
260 // We are about to create an instance - so make sure that klass is initialized
261 klass->initialize(thread);
262 if (!thread->has_pending_exception()) {
263 // Allocate new exception
264 h_exception = klass->allocate_instance_handle(thread);
265 if (!thread->has_pending_exception()) {
266 JavaValue result(T_VOID);
267 args->set_receiver(h_exception);
268 // Call constructor
269 JavaCalls::call_special(&result, klass,
270 vmSymbols::object_initializer_name(),
271 signature,
272 args,
273 thread);
274 }
275 }
276 }
277
278 // Check if another exception was thrown in the process, if so rethrow that one
279 if (thread->has_pending_exception()) {
280 h_exception = Handle(thread, thread->pending_exception());
281 thread->clear_pending_exception();
282 }
283 return h_exception;
284 }
285
286 // Creates an exception oop, calls the <init> method with the given signature.
287 // and returns a Handle
288 // Initializes the cause if cause non-null
289 Handle Exceptions::new_exception(Thread *thread, Symbol* name,
290 Symbol* signature, JavaCallArguments *args,
291 Handle h_cause,
292 Handle h_loader, Handle h_protection_domain) {
293 Handle h_exception = new_exception(thread, name, signature, args, h_loader, h_protection_domain);
294
295 // Future: object initializer should take a cause argument
296 if (h_cause.not_null()) {
297 assert(h_cause->is_a(SystemDictionary::Throwable_klass()),
298 "exception cause is not a subclass of java/lang/Throwable");
299 JavaValue result1(T_OBJECT);
300 JavaCallArguments args1;
301 args1.set_receiver(h_exception);
302 args1.push_oop(h_cause);
303 JavaCalls::call_virtual(&result1, h_exception->klass(),
304 vmSymbols::initCause_name(),
305 vmSymbols::throwable_throwable_signature(),
306 &args1,
307 thread);
308 }
309
310 // Check if another exception was thrown in the process, if so rethrow that one
311 if (thread->has_pending_exception()) {
312 h_exception = Handle(thread, thread->pending_exception());
313 thread->clear_pending_exception();
314 }
315 return h_exception;
316 }
317
318 // Convenience method. Calls either the <init>() or <init>(Throwable) method when
319 // creating a new exception
320 Handle Exceptions::new_exception(Thread* thread, Symbol* name,
321 Handle h_cause,
322 Handle h_loader, Handle h_protection_domain,
323 ExceptionMsgToUtf8Mode to_utf8_safe) {
324 JavaCallArguments args;
325 Symbol* signature = NULL;
326 if (h_cause.is_null()) {
327 signature = vmSymbols::void_method_signature();
328 } else {
329 signature = vmSymbols::throwable_void_signature();
330 args.push_oop(h_cause);
331 }
332 return new_exception(thread, name, signature, &args, h_loader, h_protection_domain);
333 }
334
335 // Convenience method. Calls either the <init>() or <init>(String) method when
336 // creating a new exception
337 Handle Exceptions::new_exception(Thread* thread, Symbol* name,
338 const char* message, Handle h_cause,
339 Handle h_loader, Handle h_protection_domain,
340 ExceptionMsgToUtf8Mode to_utf8_safe) {
341 JavaCallArguments args;
342 Symbol* signature = NULL;
343 if (message == NULL) {
344 signature = vmSymbols::void_method_signature();
345 } else {
346 // We want to allocate storage, but we can't do that if there's
347 // a pending exception, so we preserve any pending exception
348 // around the allocation.
349 // If we get an exception from the allocation, prefer that to
350 // the exception we are trying to build, or the pending exception.
351 // This is sort of like what PRESERVE_EXCEPTION_MARK does, except
352 // for the preferencing and the early returns.
353 Handle incoming_exception(thread, NULL);
354 if (thread->has_pending_exception()) {
355 incoming_exception = Handle(thread, thread->pending_exception());
356 thread->clear_pending_exception();
357 }
358 Handle msg;
359 if (to_utf8_safe == safe_to_utf8) {
360 // Make a java UTF8 string.
361 msg = java_lang_String::create_from_str(message, thread);
362 } else {
363 // Make a java string keeping the encoding scheme of the original string.
364 msg = java_lang_String::create_from_platform_dependent_str(message, thread);
365 }
366 if (thread->has_pending_exception()) {
367 Handle exception(thread, thread->pending_exception());
368 thread->clear_pending_exception();
369 return exception;
370 }
371 if (incoming_exception.not_null()) {
372 return incoming_exception;
373 }
374 args.push_oop(msg);
375 signature = vmSymbols::string_void_signature();
376 }
377 return new_exception(thread, name, signature, &args, h_cause, h_loader, h_protection_domain);
378 }
379
380 // Another convenience method that creates handles for null class loaders and
381 // protection domains and null causes.
382 // If the last parameter 'to_utf8_mode' is safe_to_utf8,
383 // it means we can safely ignore the encoding scheme of the message string and
384 // convert it directly to a java UTF8 string. Otherwise, we need to take the
385 // encoding scheme of the string into account. One thing we should do at some
386 // point is to push this flag down to class java_lang_String since other
387 // classes may need similar functionalities.
388 Handle Exceptions::new_exception(Thread* thread, Symbol* name,
389 const char* message,
390 ExceptionMsgToUtf8Mode to_utf8_safe) {
391
392 Handle h_loader(thread, NULL);
393 Handle h_prot(thread, NULL);
394 Handle h_cause(thread, NULL);
395 return Exceptions::new_exception(thread, name, message, h_cause, h_loader,
396 h_prot, to_utf8_safe);
397 }
398
399 // Implementation of ExceptionMark
400
401 ExceptionMark::ExceptionMark(Thread*& thread) {
402 thread = Thread::current();
403 _thread = thread;
404 if (_thread->has_pending_exception()) {
405 oop exception = _thread->pending_exception();
406 _thread->clear_pending_exception(); // Needed to avoid infinite recursion
407 exception->print();
408 fatal("ExceptionMark constructor expects no pending exceptions");
409 }
410 }
411
412
413 ExceptionMark::~ExceptionMark() {
414 if (_thread->has_pending_exception()) {
415 Handle exception(_thread, _thread->pending_exception());
416 _thread->clear_pending_exception(); // Needed to avoid infinite recursion
417 if (is_init_completed()) {
418 exception->print();
419 fatal("ExceptionMark destructor expects no pending exceptions");
420 } else {
421 vm_exit_during_initialization(exception);
422 }
423 }
424 }
425
426 // ----------------------------------------------------------------------------------------
427
428 #ifndef PRODUCT
429 // caller frees value_string if necessary
430 void Exceptions::debug_check_abort(const char *value_string, const char* message) {
431 if (AbortVMOnException != NULL && value_string != NULL &&
432 strstr(value_string, AbortVMOnException)) {
433 if (AbortVMOnExceptionMessage == NULL || message == NULL ||
434 strcmp(message, AbortVMOnExceptionMessage) == 0) {
435 fatal(err_msg("Saw %s, aborting", value_string));
436 }
437 }
438 }
439
440 void Exceptions::debug_check_abort(Handle exception, const char* message) {
441 if (AbortVMOnException != NULL) {
442 ResourceMark rm;
443 if (message == NULL && exception->is_a(SystemDictionary::Throwable_klass())) {
444 oop msg = java_lang_Throwable::message(exception);
445 if (msg != NULL) {
446 message = java_lang_String::as_utf8_string(msg);
447 }
448 }
449 debug_check_abort(InstanceKlass::cast(exception()->klass())->external_name(), message);
450 }
451 }
452 #endif

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