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ImplicitExceptionDispatch.java
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ImplicitExceptionDispatch.java
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/*
* Copyright (c) 2020, 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 jdk.vm.ci.code.site;
import jdk.vm.ci.code.DebugInfo;
/**
* Represents an implicit exception dispatch in the code. Implicit exception dispatch is a
* platform-specific optimization that makes use of an operating system's trap mechanism, to turn
* specific branches into sequential code with implicit traps. Information contained in this class
* will be used by the runtime to register implicit exception dispatch, i.e., a mapping from an
* exceptional PC offset to a continuation PC offset.
*/
public final class ImplicitExceptionDispatch extends Infopoint {
public final int dispatchOffset;
/**
* Construct an implicit exception dispatch.
*
* @param pcOffset the exceptional PC offset
* @param dispatchOffset the continuation PC offset
* @param debugInfo debugging information at the exceptional PC
*/
public ImplicitExceptionDispatch(int pcOffset, int dispatchOffset, DebugInfo debugInfo) {
super(pcOffset, debugInfo, InfopointReason.IMPLICIT_EXCEPTION);
this.dispatchOffset = dispatchOffset;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof ImplicitExceptionDispatch && super.equals(obj)) {
ImplicitExceptionDispatch that = (ImplicitExceptionDispatch) obj;
if (this.dispatchOffset == that.dispatchOffset) {
return true;
}
}
return false;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(pcOffset);
sb.append("->");
sb.append(dispatchOffset);
if (debugInfo != null) {
appendDebugInfo(sb, debugInfo);
}
return sb.toString();
}
}