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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2009 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.StackMapFrameVisitor;
/**
* This abstract class represents a stack map frame. Specific types
* of entries are subclassed from it.
*
* @author Eric Lafortune
*/
public abstract class StackMapFrame implements VisitorAccepter
{
public static final int SAME_ZERO_FRAME = 0;
public static final int SAME_ONE_FRAME = 64;
public static final int SAME_ONE_FRAME_EXTENDED = 247;
public static final int LESS_ZERO_FRAME = 248;
public static final int SAME_ZERO_FRAME_EXTENDED = 251;
public static final int MORE_ZERO_FRAME = 252;
public static final int FULL_FRAME = 255;
public int u2offsetDelta;
/**
* An extra field in which visitors can store information.
*/
public Object visitorInfo;
/**
* Returns the bytecode offset delta relative to the previous stack map
* frame.
*/
public int getOffsetDelta()
{
return u2offsetDelta;
}
// Abstract methods to be implemented by extensions.
/**
* Returns the stack map frame tag that specifies the entry type.
*/
public abstract int getTag();
/**
* Accepts the given visitor.
*/
public abstract void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, StackMapFrameVisitor stackMapFrameVisitor);
// Implementations for VisitorAccepter.
public Object getVisitorInfo()
{
return visitorInfo;
}
public void setVisitorInfo(Object visitorInfo)
{
this.visitorInfo = visitorInfo;
}
// Implementations for Object.
public boolean equals(Object object)
{
if (object == null ||
this.getClass() != object.getClass())
{
return false;
}
StackMapFrame other = (StackMapFrame)object;
return this.u2offsetDelta == other.u2offsetDelta;
}
public int hashCode()
{
return getClass().hashCode() ^
u2offsetDelta;
}
public String toString()
{
return "[" + u2offsetDelta + "] ";
}
}
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