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RoboVM fork of Soot - A Java optimization framework
There is a newer version: 2.5.0-9
/* Soot - a J*va Optimization Framework
 * Copyright (C) 2004 John Jorgensen
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

package soot.toolkits.exceptions;

import soot.AnySubType;
import soot.RefType;
import soot.Type;
import soot.Unit;
import soot.UnknownType;
import soot.NullType;
import soot.Value;
import soot.grimp.NewInvokeExpr;
import soot.jimple.ThrowStmt;

/**
 * Abstract class implementing parts of the {@link ThrowAnalysis}
 * interface which may be common to multiple concrete
 * ThrowAnalysis classes.
 * AbstractThrowAnalysis provides straightforward
 * implementations of {@link mightThrowExplicitly(ThrowInst)} and
 * {@link mightThrowExplicitly(ThrowStmt)}, since concrete
 * implementations of ThrowAnalysis seem likely to differ
 * mainly in their treatment of implicit exceptions.
 */
public abstract class AbstractThrowAnalysis implements ThrowAnalysis {

    abstract public ThrowableSet mightThrow(Unit u);




    public ThrowableSet mightThrowExplicitly(ThrowStmt t) {
	Value thrownExpression = t.getOp();
	Type thrownType = thrownExpression.getType();
	if (thrownType == null || thrownType instanceof UnknownType) {
	    // We can't identify the type of thrownExpression, so...
	    return ThrowableSet.Manager.v().ALL_THROWABLES;
        } else if (thrownType instanceof NullType) {
            ThrowableSet result = ThrowableSet.Manager.v().EMPTY;
            result = result.add(ThrowableSet.Manager.v().NULL_POINTER_EXCEPTION);
            return result;
	} else if (! (thrownType instanceof RefType)) {
	    throw new IllegalStateException("UnitThrowAnalysis StmtSwitch: type of throw argument is not a RefType!");
	} else {
	    ThrowableSet result = ThrowableSet.Manager.v().EMPTY;
	    if (thrownExpression instanceof NewInvokeExpr) {
		// In this case, we know the exact type of the 
		// argument exception.
		result = result.add((RefType) thrownType);
	    } else {
		result = result.add(AnySubType.v((RefType) thrownType));
	    }
	    return result;
	}
    }


	
    
    abstract public ThrowableSet mightThrowImplicitly(ThrowStmt t);
}