proguard.classfile.attribute.preverification.FullFrame Maven / Gradle / Ivy

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ProGuard is a free Java class file shrinker, optimizer, and obfuscator. It removes unused classes, fields, methods, and attributes. It then optimizes the bytecode. It then renames the remaining classes, fields, and methods using short meaningless names. Finally, it preverifies the processed code for Java 6 or for Java Micro Edition.
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/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2009 Eric Lafortune ([email protected])
 *
 * 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.*;

/**
 * This StackMapFrame represents a "full frame".
 *
 * @author Eric Lafortune
 */
public class FullFrame extends StackMapFrame
{
    public int                variablesCount;
    public VerificationType[] variables;
    public int                stackCount;
    public VerificationType[] stack;


    /**
     * Creates an uninitialized FullFrame.
     */
    public FullFrame()
    {
    }


    /**
     * Creates a FullFrame with the given variables and stack.
     */
    public FullFrame(int                offsetDelta,
                     VerificationType[] variables,
                     VerificationType[] stack)
    {
        this(offsetDelta,
             variables.length,
             variables,
             stack.length,
             stack);
    }


    /**
     * Creates a FullFrame with the given variables and stack.
     */
    public FullFrame(int                offsetDelta,
                     int                variablesCount,
                     VerificationType[] variables,
                     int                stackCount,
                     VerificationType[] stack)
    {
        this.u2offsetDelta  = offsetDelta;
        this.variablesCount = variablesCount;
        this.variables      = variables;
        this.stackCount     = stackCount;
        this.stack          = stack;
    }


    /**
     * Applies the given verification type visitor to all variables.
     */
    public void variablesAccept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, VerificationTypeVisitor verificationTypeVisitor)
    {
        for (int index = 0; index < variablesCount; index++)
        {
            variables[index].variablesAccept(clazz, method, codeAttribute, offset, index, verificationTypeVisitor);
        }
    }


    /**
     * Applies the given verification type visitor to all stack.
     */
    public void stackAccept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, VerificationTypeVisitor verificationTypeVisitor)
    {
        for (int index = 0; index < stackCount; index++)
        {
            stack[index].stackAccept(clazz, method, codeAttribute, offset, index, verificationTypeVisitor);
        }
    }


    // Implementations for StackMapFrame.

    public int getTag()
    {
        return FULL_FRAME;
    }


    public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, StackMapFrameVisitor stackMapFrameVisitor)
    {
        stackMapFrameVisitor.visitFullFrame(clazz, method, codeAttribute, offset, this);
    }


    // Implementations for Object.

    public boolean equals(Object object)
    {
        if (!super.equals(object))
        {
            return false;
        }

        FullFrame other = (FullFrame)object;

        if (this.u2offsetDelta  != other.u2offsetDelta  ||
            this.variablesCount != other.variablesCount ||
            this.stackCount     != other.stackCount)
        {
            return false;
        }

        for (int index = 0; index < variablesCount; index++)
        {
            VerificationType thisType  = this.variables[index];
            VerificationType otherType = other.variables[index];

            if (!thisType.equals(otherType))
            {
                return false;
            }
        }

        for (int index = 0; index < stackCount; index++)
        {
            VerificationType thisType  = this.stack[index];
            VerificationType otherType = other.stack[index];

            if (!thisType.equals(otherType))
            {
                return false;
            }
        }

        return true;
    }


    public int hashCode()
    {
        int hashCode = super.hashCode();

        for (int index = 0; index < variablesCount; index++)
        {
            hashCode ^= variables[index].hashCode();
        }

        for (int index = 0; index < stackCount; index++)
        {
            hashCode ^= stack[index].hashCode();
        }

        return hashCode;
    }


    public String toString()
    {
        StringBuffer buffer = new StringBuffer(super.toString()).append("Var: ");

        for (int index = 0; index < variablesCount; index++)
        {
            buffer = buffer.append('[')
                           .append(variables[index].toString())
                           .append(']');
        }

        buffer.append(", Stack: ");

        for (int index = 0; index < stackCount; index++)
        {
            buffer = buffer.append('[')
                           .append(stack[index].toString())
                           .append(']');
        }

        return buffer.toString();
    }
}