/*
* Copyright (c) 1998, 1999, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jdi.event;
import com.sun.jdi.*;
/**
* Notification of an exception in the target VM. When an exception
* is thrown which satisfies a currently enabled
* {@link com.sun.jdi.request.ExceptionRequest exception request},
* an {@link EventSet event set}
* containing an instance of this class will be added
* to the VM's event queue.
* If the exception is thrown from a non-native method,
* the exception event is generated at the location where the
* exception is thrown.
* If the exception is thrown from a native method, the exception event
* is generated at the first non-native location reached after the exception
* is thrown.
*
* @author Robert Field
* @since 1.3
*/
public interface ExceptionEvent extends LocatableEvent {
/**
* Gets the thrown exception object. The exception object is
* an instance of {@link java.lang.Throwable} or a subclass in the
* target VM.
*
* @return an {@link ObjectReference} which mirrors the thrown object in
* the target VM.
*/
public ObjectReference exception();
/**
* Gets the location where the exception will be caught. An exception
* is considered to be caught if, at the point of the throw, the
* current location is dynamically enclosed in a try statement that
* handles the exception. (See the JVM specification for details).
* If there is such a try statement, the catch location is the
* first code index of the appropriate catch clause.
* <p>
* If there are native methods in the call stack at the time of the
* exception, there are important restrictions to note about the
* returned catch location. In such cases,
* it is not possible to predict whether an exception will be handled
* by some native method on the call stack.
* Thus, it is possible that exceptions considered uncaught
* here will, in fact, be handled by a native method and not cause
* termination of the target VM. Furthermore, it cannot be assumed that the
* catch location returned here will ever be reached by the throwing
* thread. If there is
* a native frame between the current location and the catch location,
* the exception might be handled and cleared in that native method
* instead.
* <p>
* Note that the compiler can generate try-catch blocks in some cases
* where they are not explicit in the source code; for example,
* the code generated for <code>synchronized</code> and
* <code>finally</code> blocks can contain implicit try-catch blocks.
* If such an implicitly generated try-catch is
* present on the call stack at the time of the throw, the exception
* will be considered caught even though it appears to be uncaught from
* examination of the source code.
*
* @return the {@link Location} where the exception will be caught or null if
* the exception is uncaught.
*/
public Location catchLocation();
}