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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu)
*
* 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.classfile.attribute.preverification;
import proguard.classfile.*;
import proguard.classfile.attribute.CodeAttribute;
import proguard.classfile.attribute.preverification.visitor.VerificationTypeVisitor;
/**
* This abstract class represents a verification type of a local variable or
* a stack element. Specific verification types are subclassed from it.
*
* @author Eric Lafortune
*/
public abstract class VerificationType implements VisitorAccepter
{
public static final int TOP_TYPE = 0;
public static final int INTEGER_TYPE = 1;
public static final int FLOAT_TYPE = 2;
public static final int DOUBLE_TYPE = 3;
public static final int LONG_TYPE = 4;
public static final int NULL_TYPE = 5;
public static final int UNINITIALIZED_THIS_TYPE = 6;
public static final int OBJECT_TYPE = 7;
public static final int UNINITIALIZED_TYPE = 8;
/**
* An extra field in which visitors can store information.
*/
public Object visitorInfo;
/**
* Returns the tag of the verification type.
*/
public abstract int getTag();
/**
* Accepts the given visitor in the context of a method's code, either on
* a stack or as a variable.
*/
public abstract void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int instructionOffset, VerificationTypeVisitor verificationTypeVisitor);
/**
* Accepts the given visitor in the context of a stack in a method's code .
*/
public abstract void stackAccept(Clazz clazz, Method method, CodeAttribute codeAttribute, int instructionOffset, int stackIndex, VerificationTypeVisitor verificationTypeVisitor);
/**
* Accepts the given visitor in the context of a variable in a method's code.
*/
public abstract void variablesAccept(Clazz clazz, Method method, CodeAttribute codeAttribute, int instructionOffset, int variableIndex, VerificationTypeVisitor verificationTypeVisitor);
// Implementations for VisitorAccepter.
public Object getVisitorInfo()
{
return visitorInfo;
}
public void setVisitorInfo(Object visitorInfo)
{
this.visitorInfo = visitorInfo;
}
// Implementations for Object.
public boolean equals(Object object)
{
return object != null &&
this.getClass() == object.getClass();
}
public int hashCode()
{
return this.getClass().hashCode();
}
}
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