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ProGuard is a free shrinker, optimizer, obfuscator, and preverifier for Java bytecode

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/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program 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 for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.optimize.info;

import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.AttributeVisitor;

/**
 * This AttributeVisitor marks all methods that catch exceptions.
 *
 * @author Eric Lafortune
 */
public class CatchExceptionMarker
implements   AttributeVisitor
{
    // Implementations for AttributeVisitor.

    public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}


    public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
    {
        if (codeAttribute.u2exceptionTableLength > 0)
        {
            markCatchException(method);
        }
    }


    // Small utility methods.

    private static void markCatchException(Method method)
    {
        ProgramMethodOptimizationInfo.getProgramMethodOptimizationInfo(method).setCatchesExceptions();
    }


    public static boolean catchesExceptions(Method method)
    {
        return MethodOptimizationInfo.getMethodOptimizationInfo(method).catchesExceptions();
    }
}