451 lines
18 KiB
C++
451 lines
18 KiB
C++
/*
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* Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "compiler/compileBroker.hpp"
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#include "oops/oop.inline.hpp"
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#include "runtime/init.hpp"
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#include "runtime/java.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/thread.inline.hpp"
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#include "runtime/threadCritical.hpp"
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#include "utilities/events.hpp"
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#include "utilities/exceptions.hpp"
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// Implementation of ThreadShadow
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void check_ThreadShadow() {
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const ByteSize offset1 = byte_offset_of(ThreadShadow, _pending_exception);
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const ByteSize offset2 = Thread::pending_exception_offset();
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if (offset1 != offset2) fatal("ThreadShadow::_pending_exception is not positioned correctly");
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}
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void ThreadShadow::set_pending_exception(oop exception, const char* file, int line) {
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assert(exception != NULL && exception->is_oop(), "invalid exception oop");
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_pending_exception = exception;
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_exception_file = file;
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_exception_line = line;
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}
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void ThreadShadow::clear_pending_exception() {
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if (TraceClearedExceptions) {
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if (_pending_exception != NULL) {
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tty->print_cr("Thread::clear_pending_exception: cleared exception:");
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_pending_exception->print();
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}
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}
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_pending_exception = NULL;
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_exception_file = NULL;
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_exception_line = 0;
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}
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// Implementation of Exceptions
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bool Exceptions::special_exception(Thread* thread, const char* file, int line, Handle h_exception) {
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// bootstrapping check
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if (!Universe::is_fully_initialized()) {
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vm_exit_during_initialization(h_exception);
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ShouldNotReachHere();
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}
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#ifdef ASSERT
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// Check for trying to throw stack overflow before initialization is complete
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// to prevent infinite recursion trying to initialize stack overflow without
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// adequate stack space.
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// This can happen with stress testing a large value of StackShadowPages
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if (h_exception()->klass() == SystemDictionary::StackOverflowError_klass()) {
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InstanceKlass* ik = InstanceKlass::cast(h_exception->klass());
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assert(ik->is_initialized(),
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"need to increase min_stack_allowed calculation");
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}
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#endif // ASSERT
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if (thread->is_VM_thread()
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|| thread->is_Compiler_thread() ) {
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// We do not care what kind of exception we get for the vm-thread or a thread which
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// is compiling. We just install a dummy exception object
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thread->set_pending_exception(Universe::vm_exception(), file, line);
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return true;
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}
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return false;
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}
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bool Exceptions::special_exception(Thread* thread, const char* file, int line, Symbol* h_name, const char* message) {
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// bootstrapping check
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if (!Universe::is_fully_initialized()) {
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if (h_name == NULL) {
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// atleast an informative message.
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vm_exit_during_initialization("Exception", message);
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} else {
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vm_exit_during_initialization(h_name, message);
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}
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ShouldNotReachHere();
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}
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if (thread->is_VM_thread()
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|| thread->is_Compiler_thread() ) {
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// We do not care what kind of exception we get for the vm-thread or a thread which
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// is compiling. We just install a dummy exception object
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thread->set_pending_exception(Universe::vm_exception(), file, line);
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return true;
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}
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return false;
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}
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// This method should only be called from generated code,
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// therefore the exception oop should be in the oopmap.
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void Exceptions::_throw_oop(Thread* thread, const char* file, int line, oop exception) {
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assert(exception != NULL, "exception should not be NULL");
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Handle h_exception = Handle(thread, exception);
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_throw(thread, file, line, h_exception);
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}
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void Exceptions::_throw(Thread* thread, const char* file, int line, Handle h_exception, const char* message) {
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ResourceMark rm;
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assert(h_exception() != NULL, "exception should not be NULL");
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// tracing (do this up front - so it works during boot strapping)
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if (TraceExceptions) {
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ttyLocker ttyl;
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tty->print_cr("Exception <%s%s%s> (" INTPTR_FORMAT ") \n"
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"thrown [%s, line %d]\nfor thread " INTPTR_FORMAT,
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h_exception->print_value_string(),
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message ? ": " : "", message ? message : "",
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(address)h_exception(), file, line, thread);
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}
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// for AbortVMOnException flag
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NOT_PRODUCT(Exceptions::debug_check_abort(h_exception, message));
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// Check for special boot-strapping/vm-thread handling
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if (special_exception(thread, file, line, h_exception)) {
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return;
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}
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assert(h_exception->is_a(SystemDictionary::Throwable_klass()), "exception is not a subclass of java/lang/Throwable");
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// set the pending exception
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thread->set_pending_exception(h_exception(), file, line);
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// vm log
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Events::log_exception(thread, "Exception <%s%s%s> (" INTPTR_FORMAT ") thrown at [%s, line %d]",
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h_exception->print_value_string(), message ? ": " : "", message ? message : "",
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(address)h_exception(), file, line);
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}
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void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message,
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Handle h_loader, Handle h_protection_domain) {
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// Check for special boot-strapping/vm-thread handling
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if (special_exception(thread, file, line, name, message)) return;
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// Create and throw exception
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Handle h_cause(thread, NULL);
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Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain);
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_throw(thread, file, line, h_exception, message);
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}
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void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause,
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Handle h_loader, Handle h_protection_domain) {
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// Check for special boot-strapping/vm-thread handling
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if (special_exception(thread, file, line, name, message)) return;
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// Create and throw exception and init cause
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Handle h_exception = new_exception(thread, name, message, h_cause, h_loader, h_protection_domain);
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_throw(thread, file, line, h_exception, message);
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}
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void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause,
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Handle h_loader, Handle h_protection_domain) {
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// Check for special boot-strapping/vm-thread handling
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if (special_exception(thread, file, line, h_cause)) return;
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// Create and throw exception
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Handle h_exception = new_exception(thread, name, h_cause, h_loader, h_protection_domain);
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_throw(thread, file, line, h_exception, NULL);
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}
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void Exceptions::_throw_args(Thread* thread, const char* file, int line, Symbol* name, Symbol* signature, JavaCallArguments *args) {
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// Check for special boot-strapping/vm-thread handling
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if (special_exception(thread, file, line, name, NULL)) return;
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// Create and throw exception
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Handle h_loader(thread, NULL);
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Handle h_prot(thread, NULL);
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Handle exception = new_exception(thread, name, signature, args, h_loader, h_prot);
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_throw(thread, file, line, exception);
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}
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// Methods for default parameters.
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// NOTE: These must be here (and not in the header file) because of include circularities.
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void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause) {
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_throw_msg_cause(thread, file, line, name, message, h_cause, Handle(thread, NULL), Handle(thread, NULL));
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}
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void Exceptions::_throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message) {
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_throw_msg(thread, file, line, name, message, Handle(thread, NULL), Handle(thread, NULL));
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}
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void Exceptions::_throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause) {
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_throw_cause(thread, file, line, name, h_cause, Handle(thread, NULL), Handle(thread, NULL));
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}
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void Exceptions::throw_stack_overflow_exception(Thread* THREAD, const char* file, int line, methodHandle method) {
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Handle exception;
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if (!THREAD->has_pending_exception()) {
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Klass* k = SystemDictionary::StackOverflowError_klass();
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oop e = InstanceKlass::cast(k)->allocate_instance(CHECK);
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exception = Handle(THREAD, e); // fill_in_stack trace does gc
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assert(InstanceKlass::cast(k)->is_initialized(), "need to increase min_stack_allowed calculation");
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if (StackTraceInThrowable) {
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java_lang_Throwable::fill_in_stack_trace(exception, method());
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}
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} else {
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// if prior exception, throw that one instead
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exception = Handle(THREAD, THREAD->pending_exception());
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}
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_throw(THREAD, file, line, exception);
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}
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void Exceptions::fthrow(Thread* thread, const char* file, int line, Symbol* h_name, const char* format, ...) {
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const int max_msg_size = 1024;
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va_list ap;
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va_start(ap, format);
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char msg[max_msg_size];
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vsnprintf(msg, max_msg_size, format, ap);
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msg[max_msg_size-1] = '\0';
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va_end(ap);
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_throw_msg(thread, file, line, h_name, msg);
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}
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// Creates an exception oop, calls the <init> method with the given signature.
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// and returns a Handle
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Handle Exceptions::new_exception(Thread *thread, Symbol* name,
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Symbol* signature, JavaCallArguments *args,
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Handle h_loader, Handle h_protection_domain) {
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assert(Universe::is_fully_initialized(),
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"cannot be called during initialization");
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assert(thread->is_Java_thread(), "can only be called by a Java thread");
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assert(!thread->has_pending_exception(), "already has exception");
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Handle h_exception;
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// Resolve exception klass
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Klass* ik = SystemDictionary::resolve_or_fail(name, h_loader, h_protection_domain, true, thread);
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instanceKlassHandle klass(thread, ik);
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if (!thread->has_pending_exception()) {
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assert(klass.not_null(), "klass must exist");
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// We are about to create an instance - so make sure that klass is initialized
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klass->initialize(thread);
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if (!thread->has_pending_exception()) {
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// Allocate new exception
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h_exception = klass->allocate_instance_handle(thread);
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if (!thread->has_pending_exception()) {
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JavaValue result(T_VOID);
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args->set_receiver(h_exception);
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// Call constructor
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JavaCalls::call_special(&result, klass,
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vmSymbols::object_initializer_name(),
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signature,
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args,
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thread);
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}
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}
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}
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// Check if another exception was thrown in the process, if so rethrow that one
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if (thread->has_pending_exception()) {
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h_exception = Handle(thread, thread->pending_exception());
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thread->clear_pending_exception();
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}
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return h_exception;
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}
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// Creates an exception oop, calls the <init> method with the given signature.
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// and returns a Handle
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// Initializes the cause if cause non-null
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Handle Exceptions::new_exception(Thread *thread, Symbol* name,
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Symbol* signature, JavaCallArguments *args,
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Handle h_cause,
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Handle h_loader, Handle h_protection_domain) {
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Handle h_exception = new_exception(thread, name, signature, args, h_loader, h_protection_domain);
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// Future: object initializer should take a cause argument
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if (h_cause.not_null()) {
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assert(h_cause->is_a(SystemDictionary::Throwable_klass()),
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"exception cause is not a subclass of java/lang/Throwable");
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JavaValue result1(T_OBJECT);
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JavaCallArguments args1;
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args1.set_receiver(h_exception);
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args1.push_oop(h_cause);
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JavaCalls::call_virtual(&result1, h_exception->klass(),
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vmSymbols::initCause_name(),
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vmSymbols::throwable_throwable_signature(),
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&args1,
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thread);
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}
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// Check if another exception was thrown in the process, if so rethrow that one
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if (thread->has_pending_exception()) {
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h_exception = Handle(thread, thread->pending_exception());
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thread->clear_pending_exception();
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}
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return h_exception;
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}
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// Convenience method. Calls either the <init>() or <init>(Throwable) method when
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// creating a new exception
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Handle Exceptions::new_exception(Thread* thread, Symbol* name,
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Handle h_cause,
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Handle h_loader, Handle h_protection_domain,
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ExceptionMsgToUtf8Mode to_utf8_safe) {
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JavaCallArguments args;
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Symbol* signature = NULL;
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if (h_cause.is_null()) {
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signature = vmSymbols::void_method_signature();
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} else {
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signature = vmSymbols::throwable_void_signature();
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args.push_oop(h_cause);
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}
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return new_exception(thread, name, signature, &args, h_loader, h_protection_domain);
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}
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// Convenience method. Calls either the <init>() or <init>(String) method when
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// creating a new exception
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Handle Exceptions::new_exception(Thread* thread, Symbol* name,
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const char* message, Handle h_cause,
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Handle h_loader, Handle h_protection_domain,
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ExceptionMsgToUtf8Mode to_utf8_safe) {
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JavaCallArguments args;
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Symbol* signature = NULL;
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if (message == NULL) {
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signature = vmSymbols::void_method_signature();
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} else {
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// We want to allocate storage, but we can't do that if there's
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// a pending exception, so we preserve any pending exception
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// around the allocation.
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// If we get an exception from the allocation, prefer that to
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// the exception we are trying to build, or the pending exception.
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// This is sort of like what PRESERVE_EXCEPTION_MARK does, except
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// for the preferencing and the early returns.
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Handle incoming_exception(thread, NULL);
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if (thread->has_pending_exception()) {
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incoming_exception = Handle(thread, thread->pending_exception());
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thread->clear_pending_exception();
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}
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Handle msg;
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if (to_utf8_safe == safe_to_utf8) {
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// Make a java UTF8 string.
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msg = java_lang_String::create_from_str(message, thread);
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} else {
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// Make a java string keeping the encoding scheme of the original string.
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msg = java_lang_String::create_from_platform_dependent_str(message, thread);
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}
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if (thread->has_pending_exception()) {
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Handle exception(thread, thread->pending_exception());
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thread->clear_pending_exception();
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return exception;
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}
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if (incoming_exception.not_null()) {
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return incoming_exception;
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}
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args.push_oop(msg);
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signature = vmSymbols::string_void_signature();
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}
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return new_exception(thread, name, signature, &args, h_cause, h_loader, h_protection_domain);
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}
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// Another convenience method that creates handles for null class loaders and
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// protection domains and null causes.
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// If the last parameter 'to_utf8_mode' is safe_to_utf8,
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// it means we can safely ignore the encoding scheme of the message string and
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// convert it directly to a java UTF8 string. Otherwise, we need to take the
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// encoding scheme of the string into account. One thing we should do at some
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// point is to push this flag down to class java_lang_String since other
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// classes may need similar functionalities.
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Handle Exceptions::new_exception(Thread* thread, Symbol* name,
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const char* message,
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ExceptionMsgToUtf8Mode to_utf8_safe) {
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Handle h_loader(thread, NULL);
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Handle h_prot(thread, NULL);
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Handle h_cause(thread, NULL);
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return Exceptions::new_exception(thread, name, message, h_cause, h_loader,
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h_prot, to_utf8_safe);
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}
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// Implementation of ExceptionMark
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ExceptionMark::ExceptionMark(Thread*& thread) {
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thread = Thread::current();
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_thread = thread;
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if (_thread->has_pending_exception()) {
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oop exception = _thread->pending_exception();
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_thread->clear_pending_exception(); // Needed to avoid infinite recursion
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exception->print();
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fatal("ExceptionMark constructor expects no pending exceptions");
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}
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}
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ExceptionMark::~ExceptionMark() {
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if (_thread->has_pending_exception()) {
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Handle exception(_thread, _thread->pending_exception());
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_thread->clear_pending_exception(); // Needed to avoid infinite recursion
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if (is_init_completed()) {
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exception->print();
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fatal("ExceptionMark destructor expects no pending exceptions");
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} else {
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vm_exit_during_initialization(exception);
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}
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}
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}
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// ----------------------------------------------------------------------------------------
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#ifndef PRODUCT
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// caller frees value_string if necessary
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void Exceptions::debug_check_abort(const char *value_string, const char* message) {
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if (AbortVMOnException != NULL && value_string != NULL &&
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strstr(value_string, AbortVMOnException)) {
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if (AbortVMOnExceptionMessage == NULL || message == NULL ||
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strcmp(message, AbortVMOnExceptionMessage) == 0) {
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fatal(err_msg("Saw %s, aborting", value_string));
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}
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}
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}
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void Exceptions::debug_check_abort(Handle exception, const char* message) {
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if (AbortVMOnException != NULL) {
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ResourceMark rm;
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if (message == NULL && exception->is_a(SystemDictionary::Throwable_klass())) {
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oop msg = java_lang_Throwable::message(exception);
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if (msg != NULL) {
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message = java_lang_String::as_utf8_string(msg);
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}
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}
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debug_check_abort(InstanceKlass::cast(exception()->klass())->external_name(), message);
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}
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}
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#endif
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