/* * ExceptionEntry.java 1.4 99/04/06 SMI * * Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved. * * This software is the confidential and proprietary information of Sun * Microsystems, Inc. ("Confidential Information"). You shall not * disclose such Confidential Information and shall use it only in * accordance with the terms of the license agreement you entered into * with Sun. * * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING * THIS SOFTWARE OR ITS DERIVATIVES. * Use is subject to license terms. */ package components; import java.io.DataOutput; import java.io.IOException; import vm.Const; import util.DataFormatException; /* * An ExceptionEntry represents a range of Java bytecode PC values, * a Java exception type, and an action to take should that exception be * thrown in that range. * * Exception entries are read by components.MethodInfo, though perhaps * that code should be moved here. At least we know how to write ourselves * out. */ public class ExceptionEntry { public ClassConstant catchType; public int startPC, endPC; public int handlerPC; public static final int size = 8; // bytes in class files ExceptionEntry( int s, int e, int h, ClassConstant c ){ startPC = s; endPC = e; handlerPC= h; catchType = c; } public void write( DataOutput o ) throws IOException { o.writeShort( startPC ); o.writeShort( endPC ); o.writeShort( handlerPC ); o.writeShort( (catchType==null) ? 0 : catchType.index ); } /* * A class referenced from an ExceptionEntry * is in the local constant pool, not the shared one. * * Thus it must not be externalized, but must be counted. * These decisions could be exposed at a higher level, for some * savings in performance, and should be when I have the * courage of my convictions. */ public void externalize( ConstantPool p ){ // do nothing. } public void countConstantReferences( ){ if ( catchType != null ) catchType.incReference(); } }
