1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/utilities/exceptions.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,452 @@
1.4 +/*
1.5 + * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "classfile/systemDictionary.hpp"
1.30 +#include "classfile/vmSymbols.hpp"
1.31 +#include "compiler/compileBroker.hpp"
1.32 +#include "oops/oop.inline.hpp"
1.33 +#include "runtime/init.hpp"
1.34 +#include "runtime/java.hpp"
1.35 +#include "runtime/javaCalls.hpp"
1.36 +#include "runtime/thread.inline.hpp"
1.37 +#include "runtime/threadCritical.hpp"
1.38 +#include "utilities/events.hpp"
1.39 +#include "utilities/exceptions.hpp"
1.40 +
1.41 +PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
1.42 +
1.43 +// Implementation of ThreadShadow
1.44 +void check_ThreadShadow() {
1.45 + const ByteSize offset1 = byte_offset_of(ThreadShadow, _pending_exception);
1.46 + const ByteSize offset2 = Thread::pending_exception_offset();
1.47 + if (offset1 != offset2) fatal("ThreadShadow::_pending_exception is not positioned correctly");
1.48 +}
1.49 +
1.50 +
1.51 +void ThreadShadow::set_pending_exception(oop exception, const char* file, int line) {
1.52 + assert(exception != NULL && exception->is_oop(), "invalid exception oop");
1.53 + _pending_exception = exception;
1.54 + _exception_file = file;
1.55 + _exception_line = line;
1.56 +}
1.57 +
1.58 +void ThreadShadow::clear_pending_exception() {
1.59 + if (TraceClearedExceptions) {
1.60 + if (_pending_exception != NULL) {
1.61 + tty->print_cr("Thread::clear_pending_exception: cleared exception:");
1.62 + _pending_exception->print();
1.63 + }
1.64 + }
1.65 + _pending_exception = NULL;
1.66 + _exception_file = NULL;
1.67 + _exception_line = 0;
1.68 +}
1.69 +// Implementation of Exceptions
1.70 +
1.71 +bool Exceptions::special_exception(Thread* thread, const char* file, int line, Handle h_exception) {
1.72 + // bootstrapping check
1.73 + if (!Universe::is_fully_initialized()) {
1.74 + vm_exit_during_initialization(h_exception);
1.75 + ShouldNotReachHere();
1.76 + }
1.77 +
1.78 +#ifdef ASSERT
1.79 + // Check for trying to throw stack overflow before initialization is complete
1.80 + // to prevent infinite recursion trying to initialize stack overflow without
1.81 + // adequate stack space.
1.82 + // This can happen with stress testing a large value of StackShadowPages
1.83 + if (h_exception()->klass() == SystemDictionary::StackOverflowError_klass()) {
1.84 + InstanceKlass* ik = InstanceKlass::cast(h_exception->klass());
1.85 + assert(ik->is_initialized(),
1.86 + "need to increase min_stack_allowed calculation");
1.87 + }
1.88 +#endif // ASSERT
1.89 +
1.90 + if (thread->is_VM_thread()
1.91 + || thread->is_Compiler_thread() ) {
1.92 + // We do not care what kind of exception we get for the vm-thread or a thread which
1.93 + // is compiling. We just install a dummy exception object
1.94 + thread->set_pending_exception(Universe::vm_exception(), file, line);
1.95 + return true;
1.96 + }
1.97 +
1.98 + return false;
1.99 +}
1.100 +
1.101 +bool Exceptions::special_exception(Thread* thread, const char* file, int line, Symbol* h_name, const char* message) {
1.102 + // bootstrapping check
1.103 + if (!Universe::is_fully_initialized()) {
1.104 + if (h_name == NULL) {
1.105 + // atleast an informative message.
1.106 + vm_exit_during_initialization("Exception", message);
1.107 + } else {
1.108 + vm_exit_during_initialization(h_name, message);
1.109 + }
1.110 + ShouldNotReachHere();
1.111 + }
1.112 +
1.113 + if (thread->is_VM_thread()
1.114 + || thread->is_Compiler_thread() ) {
1.115 + // We do not care what kind of exception we get for the vm-thread or a thread which
1.116 + // is compiling. We just install a dummy exception object
1.117 + thread->set_pending_exception(Universe::vm_exception(), file, line);
1.118 + return true;
1.119 + }
1.120 + return false;
1.121 +}
1.122 +
1.123 +// This method should only be called from generated code,
1.124 +// therefore the exception oop should be in the oopmap.
1.125 +void Exceptions::_throw_oop(Thread* thread, const char* file, int line, oop exception) {
1.126 + assert(exception != NULL, "exception should not be NULL");
1.127 + Handle h_exception = Handle(thread, exception);
1.128 + _throw(thread, file, line, h_exception);
1.129 +}
1.130 +
1.131 +void Exceptions::_throw(Thread* thread, const char* file, int line, Handle h_exception, const char* message) {
1.132 + ResourceMark rm;
1.133 + assert(h_exception() != NULL, "exception should not be NULL");
1.134 +
1.135 + // tracing (do this up front - so it works during boot strapping)
1.136 + if (TraceExceptions) {
1.137 + ttyLocker ttyl;
1.138 + tty->print_cr("Exception <%s%s%s> (" INTPTR_FORMAT ") \n"
1.139 + "thrown [%s, line %d]\nfor thread " INTPTR_FORMAT,
1.140 + h_exception->print_value_string(),
1.141 + message ? ": " : "", message ? message : "",
1.142 + (address)h_exception(), file, line, thread);
1.143 + }
1.144 + // for AbortVMOnException flag
1.145 + NOT_PRODUCT(Exceptions::debug_check_abort(h_exception, message));
1.146 +
1.147 + // Check for special boot-strapping/vm-thread handling
1.148 + if (special_exception(thread, file, line, h_exception)) {
1.149 + return;
1.150 + }
1.151 +
1.152 + assert(h_exception->is_a(SystemDictionary::Throwable_klass()), "exception is not a subclass of java/lang/Throwable");
1.153 +
1.154 + // set the pending exception
1.155 + thread->set_pending_exception(h_exception(), file, line);
1.156 +
1.157 + // vm log
1.158 + Events::log_exception(thread, "Exception <%s%s%s> (" INTPTR_FORMAT ") thrown at [%s, line %d]",
1.159 + h_exception->print_value_string(), message ? ": " : "", message ? message : "",
1.160 + (address)h_exception(), file, line);
1.161 +}
1.162 +
1.163 +
1.164 +void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message,
1.165 + Handle h_loader, Handle h_protection_domain) {
1.166 + // Check for special boot-strapping/vm-thread handling
1.167 + if (special_exception(thread, file, line, name, message)) return;
1.168 + // Create and throw exception
1.169 + Handle h_cause(thread, NULL);
1.170 + Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain);
1.171 + _throw(thread, file, line, h_exception, message);
1.172 +}
1.173 +
1.174 +void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause,
1.175 + Handle h_loader, Handle h_protection_domain) {
1.176 + // Check for special boot-strapping/vm-thread handling
1.177 + if (special_exception(thread, file, line, name, message)) return;
1.178 + // Create and throw exception and init cause
1.179 + Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain);
1.180 + _throw(thread, file, line, h_exception, message);
1.181 +}
1.182 +
1.183 +void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause,
1.184 + Handle h_loader, Handle h_protection_domain) {
1.185 + // Check for special boot-strapping/vm-thread handling
1.186 + if (special_exception(thread, file, line, h_cause)) return;
1.187 + // Create and throw exception
1.188 + Handle h_exception = new_exception(thread, name, h_cause, h_loader, h_protection_domain);
1.189 + _throw(thread, file, line, h_exception, NULL);
1.190 +}
1.191 +
1.192 +void Exceptions::_throw_args(Thread* thread, const char* file, int line, Symbol* name, Symbol* signature, JavaCallArguments *args) {
1.193 + // Check for special boot-strapping/vm-thread handling
1.194 + if (special_exception(thread, file, line, name, NULL)) return;
1.195 + // Create and throw exception
1.196 + Handle h_loader(thread, NULL);
1.197 + Handle h_prot(thread, NULL);
1.198 + Handle exception = new_exception(thread, name, signature, args, h_loader, h_prot);
1.199 + _throw(thread, file, line, exception);
1.200 +}
1.201 +
1.202 +
1.203 +// Methods for default parameters.
1.204 +// NOTE: These must be here (and not in the header file) because of include circularities.
1.205 +void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause) {
1.206 + _throw_msg_cause(thread, file, line, name, message, h_cause, Handle(thread, NULL), Handle(thread, NULL));
1.207 +}
1.208 +void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message) {
1.209 + _throw_msg(thread, file, line, name, message, Handle(thread, NULL), Handle(thread, NULL));
1.210 +}
1.211 +void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause) {
1.212 + _throw_cause(thread, file, line, name, h_cause, Handle(thread, NULL), Handle(thread, NULL));
1.213 +}
1.214 +
1.215 +
1.216 +void Exceptions::throw_stack_overflow_exception(Thread* THREAD, const char* file, int line, methodHandle method) {
1.217 + Handle exception;
1.218 + if (!THREAD->has_pending_exception()) {
1.219 + Klass* k = SystemDictionary::StackOverflowError_klass();
1.220 + oop e = InstanceKlass::cast(k)->allocate_instance(CHECK);
1.221 + exception = Handle(THREAD, e); // fill_in_stack trace does gc
1.222 + assert(InstanceKlass::cast(k)->is_initialized(), "need to increase min_stack_allowed calculation");
1.223 + if (StackTraceInThrowable) {
1.224 + java_lang_Throwable::fill_in_stack_trace(exception, method());
1.225 + }
1.226 + } else {
1.227 + // if prior exception, throw that one instead
1.228 + exception = Handle(THREAD, THREAD->pending_exception());
1.229 + }
1.230 + _throw(THREAD, file, line, exception);
1.231 +}
1.232 +
1.233 +void Exceptions::fthrow(Thread* thread, const char* file, int line, Symbol* h_name, const char* format, ...) {
1.234 + const int max_msg_size = 1024;
1.235 + va_list ap;
1.236 + va_start(ap, format);
1.237 + char msg[max_msg_size];
1.238 + vsnprintf(msg, max_msg_size, format, ap);
1.239 + msg[max_msg_size-1] = '\0';
1.240 + va_end(ap);
1.241 + _throw_msg(thread, file, line, h_name, msg);
1.242 +}
1.243 +
1.244 +
1.245 +// Creates an exception oop, calls the <init> method with the given signature.
1.246 +// and returns a Handle
1.247 +Handle Exceptions::new_exception(Thread *thread, Symbol* name,
1.248 + Symbol* signature, JavaCallArguments *args,
1.249 + Handle h_loader, Handle h_protection_domain) {
1.250 + assert(Universe::is_fully_initialized(),
1.251 + "cannot be called during initialization");
1.252 + assert(thread->is_Java_thread(), "can only be called by a Java thread");
1.253 + assert(!thread->has_pending_exception(), "already has exception");
1.254 +
1.255 + Handle h_exception;
1.256 +
1.257 + // Resolve exception klass
1.258 + Klass* ik = SystemDictionary::resolve_or_fail(name, h_loader, h_protection_domain, true, thread);
1.259 + instanceKlassHandle klass(thread, ik);
1.260 +
1.261 + if (!thread->has_pending_exception()) {
1.262 + assert(klass.not_null(), "klass must exist");
1.263 + // We are about to create an instance - so make sure that klass is initialized
1.264 + klass->initialize(thread);
1.265 + if (!thread->has_pending_exception()) {
1.266 + // Allocate new exception
1.267 + h_exception = klass->allocate_instance_handle(thread);
1.268 + if (!thread->has_pending_exception()) {
1.269 + JavaValue result(T_VOID);
1.270 + args->set_receiver(h_exception);
1.271 + // Call constructor
1.272 + JavaCalls::call_special(&result, klass,
1.273 + vmSymbols::object_initializer_name(),
1.274 + signature,
1.275 + args,
1.276 + thread);
1.277 + }
1.278 + }
1.279 + }
1.280 +
1.281 + // Check if another exception was thrown in the process, if so rethrow that one
1.282 + if (thread->has_pending_exception()) {
1.283 + h_exception = Handle(thread, thread->pending_exception());
1.284 + thread->clear_pending_exception();
1.285 + }
1.286 + return h_exception;
1.287 +}
1.288 +
1.289 +// Creates an exception oop, calls the <init> method with the given signature.
1.290 +// and returns a Handle
1.291 +// Initializes the cause if cause non-null
1.292 +Handle Exceptions::new_exception(Thread *thread, Symbol* name,
1.293 + Symbol* signature, JavaCallArguments *args,
1.294 + Handle h_cause,
1.295 + Handle h_loader, Handle h_protection_domain) {
1.296 + Handle h_exception = new_exception(thread, name, signature, args, h_loader, h_protection_domain);
1.297 +
1.298 + // Future: object initializer should take a cause argument
1.299 + if (h_cause.not_null()) {
1.300 + assert(h_cause->is_a(SystemDictionary::Throwable_klass()),
1.301 + "exception cause is not a subclass of java/lang/Throwable");
1.302 + JavaValue result1(T_OBJECT);
1.303 + JavaCallArguments args1;
1.304 + args1.set_receiver(h_exception);
1.305 + args1.push_oop(h_cause);
1.306 + JavaCalls::call_virtual(&result1, h_exception->klass(),
1.307 + vmSymbols::initCause_name(),
1.308 + vmSymbols::throwable_throwable_signature(),
1.309 + &args1,
1.310 + thread);
1.311 + }
1.312 +
1.313 + // Check if another exception was thrown in the process, if so rethrow that one
1.314 + if (thread->has_pending_exception()) {
1.315 + h_exception = Handle(thread, thread->pending_exception());
1.316 + thread->clear_pending_exception();
1.317 + }
1.318 + return h_exception;
1.319 +}
1.320 +
1.321 +// Convenience method. Calls either the <init>() or <init>(Throwable) method when
1.322 +// creating a new exception
1.323 +Handle Exceptions::new_exception(Thread* thread, Symbol* name,
1.324 + Handle h_cause,
1.325 + Handle h_loader, Handle h_protection_domain,
1.326 + ExceptionMsgToUtf8Mode to_utf8_safe) {
1.327 + JavaCallArguments args;
1.328 + Symbol* signature = NULL;
1.329 + if (h_cause.is_null()) {
1.330 + signature = vmSymbols::void_method_signature();
1.331 + } else {
1.332 + signature = vmSymbols::throwable_void_signature();
1.333 + args.push_oop(h_cause);
1.334 + }
1.335 + return new_exception(thread, name, signature, &args, h_loader, h_protection_domain);
1.336 +}
1.337 +
1.338 +// Convenience method. Calls either the <init>() or <init>(String) method when
1.339 +// creating a new exception
1.340 +Handle Exceptions::new_exception(Thread* thread, Symbol* name,
1.341 + const char* message, Handle h_cause,
1.342 + Handle h_loader, Handle h_protection_domain,
1.343 + ExceptionMsgToUtf8Mode to_utf8_safe) {
1.344 + JavaCallArguments args;
1.345 + Symbol* signature = NULL;
1.346 + if (message == NULL) {
1.347 + signature = vmSymbols::void_method_signature();
1.348 + } else {
1.349 + // We want to allocate storage, but we can't do that if there's
1.350 + // a pending exception, so we preserve any pending exception
1.351 + // around the allocation.
1.352 + // If we get an exception from the allocation, prefer that to
1.353 + // the exception we are trying to build, or the pending exception.
1.354 + // This is sort of like what PRESERVE_EXCEPTION_MARK does, except
1.355 + // for the preferencing and the early returns.
1.356 + Handle incoming_exception(thread, NULL);
1.357 + if (thread->has_pending_exception()) {
1.358 + incoming_exception = Handle(thread, thread->pending_exception());
1.359 + thread->clear_pending_exception();
1.360 + }
1.361 + Handle msg;
1.362 + if (to_utf8_safe == safe_to_utf8) {
1.363 + // Make a java UTF8 string.
1.364 + msg = java_lang_String::create_from_str(message, thread);
1.365 + } else {
1.366 + // Make a java string keeping the encoding scheme of the original string.
1.367 + msg = java_lang_String::create_from_platform_dependent_str(message, thread);
1.368 + }
1.369 + if (thread->has_pending_exception()) {
1.370 + Handle exception(thread, thread->pending_exception());
1.371 + thread->clear_pending_exception();
1.372 + return exception;
1.373 + }
1.374 + if (incoming_exception.not_null()) {
1.375 + return incoming_exception;
1.376 + }
1.377 + args.push_oop(msg);
1.378 + signature = vmSymbols::string_void_signature();
1.379 + }
1.380 + return new_exception(thread, name, signature, &args, h_cause, h_loader, h_protection_domain);
1.381 +}
1.382 +
1.383 +// Another convenience method that creates handles for null class loaders and
1.384 +// protection domains and null causes.
1.385 +// If the last parameter 'to_utf8_mode' is safe_to_utf8,
1.386 +// it means we can safely ignore the encoding scheme of the message string and
1.387 +// convert it directly to a java UTF8 string. Otherwise, we need to take the
1.388 +// encoding scheme of the string into account. One thing we should do at some
1.389 +// point is to push this flag down to class java_lang_String since other
1.390 +// classes may need similar functionalities.
1.391 +Handle Exceptions::new_exception(Thread* thread, Symbol* name,
1.392 + const char* message,
1.393 + ExceptionMsgToUtf8Mode to_utf8_safe) {
1.394 +
1.395 + Handle h_loader(thread, NULL);
1.396 + Handle h_prot(thread, NULL);
1.397 + Handle h_cause(thread, NULL);
1.398 + return Exceptions::new_exception(thread, name, message, h_cause, h_loader,
1.399 + h_prot, to_utf8_safe);
1.400 +}
1.401 +
1.402 +// Implementation of ExceptionMark
1.403 +
1.404 +ExceptionMark::ExceptionMark(Thread*& thread) {
1.405 + thread = Thread::current();
1.406 + _thread = thread;
1.407 + if (_thread->has_pending_exception()) {
1.408 + oop exception = _thread->pending_exception();
1.409 + _thread->clear_pending_exception(); // Needed to avoid infinite recursion
1.410 + exception->print();
1.411 + fatal("ExceptionMark constructor expects no pending exceptions");
1.412 + }
1.413 +}
1.414 +
1.415 +
1.416 +ExceptionMark::~ExceptionMark() {
1.417 + if (_thread->has_pending_exception()) {
1.418 + Handle exception(_thread, _thread->pending_exception());
1.419 + _thread->clear_pending_exception(); // Needed to avoid infinite recursion
1.420 + if (is_init_completed()) {
1.421 + exception->print();
1.422 + fatal("ExceptionMark destructor expects no pending exceptions");
1.423 + } else {
1.424 + vm_exit_during_initialization(exception);
1.425 + }
1.426 + }
1.427 +}
1.428 +
1.429 +// ----------------------------------------------------------------------------------------
1.430 +
1.431 +#ifndef PRODUCT
1.432 +// caller frees value_string if necessary
1.433 +void Exceptions::debug_check_abort(const char *value_string, const char* message) {
1.434 + if (AbortVMOnException != NULL && value_string != NULL &&
1.435 + strstr(value_string, AbortVMOnException)) {
1.436 + if (AbortVMOnExceptionMessage == NULL || message == NULL ||
1.437 + strcmp(message, AbortVMOnExceptionMessage) == 0) {
1.438 + fatal(err_msg("Saw %s, aborting", value_string));
1.439 + }
1.440 + }
1.441 +}
1.442 +
1.443 +void Exceptions::debug_check_abort(Handle exception, const char* message) {
1.444 + if (AbortVMOnException != NULL) {
1.445 + ResourceMark rm;
1.446 + if (message == NULL && exception->is_a(SystemDictionary::Throwable_klass())) {
1.447 + oop msg = java_lang_Throwable::message(exception);
1.448 + if (msg != NULL) {
1.449 + message = java_lang_String::as_utf8_string(msg);
1.450 + }
1.451 + }
1.452 + debug_check_abort(InstanceKlass::cast(exception()->klass())->external_name(), message);
1.453 + }
1.454 +}
1.455 +#endif
