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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2014 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 StackMapFrame represents a "same frame" or a "same frame extended".
*
* @author Eric Lafortune
* @noinspection PointlessArithmeticExpression
*/
public class SameZeroFrame extends StackMapFrame
{
/**
* Creates an uninitialized SameZeroFrame.
*/
public SameZeroFrame()
{
}
/**
* Creates a SameZeroFrame with the given tag.
*/
public SameZeroFrame(int tag)
{
u2offsetDelta = tag - SAME_ZERO_FRAME;
}
// Implementations for StackMapFrame.
public int getTag()
{
return u2offsetDelta < 64 ?
SAME_ZERO_FRAME + u2offsetDelta :
SAME_ZERO_FRAME_EXTENDED;
}
public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, StackMapFrameVisitor stackMapFrameVisitor)
{
stackMapFrameVisitor.visitSameZeroFrame(clazz, method, codeAttribute, offset, this);
}
// Implementations for Object.
public String toString()
{
return super.toString()+"Var: ..., Stack: (empty)";
}
}
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