Subversion Repositories openrisc

/***

 * ASM: a very small and fast Java bytecode manipulation framework

 * Copyright (c) 2000-2005 INRIA, France Telecom

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the copyright holders nor the names of its

 *    contributors may be used to endorse or promote products derived from

 *    this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

 * THE POSSIBILITY OF SUCH DAMAGE.

 */

package org.objectweb.asm.tree.analysis;

import java.util.Set;

import org.objectweb.asm.tree.AbstractInsnNode;

/**

 * A {@link Value} that is represented by its type in a two types type system.

 * This type system distinguishes the ONEWORD and TWOWORDS types.

 *

 * @author Eric Bruneton

 */

public class DataflowValue implements Value {

    /**

     * The size of this value.

     */

    public final int size;

    /**

     * The instructions that can produce this value. For example, for the Java

     * code below, the instructions that can produce the value of <tt>i</tt>

     * at line 5 are the txo ISTORE instructions at line 1 and 3:

     *

     * <pre>

     * 1: i = 0;

     * 2: if (...) {

     * 3:   i = 1;

     * 4: }

     * 5: return i;

     * </pre>

     *

     * This field is a set of {@link AbstractInsnNode} objects.

     */

    public final Set insns;

    public DataflowValue(final int size) {

        this(size, SmallSet.EMPTY_SET);

    }

    public DataflowValue(final int size, final AbstractInsnNode insn) {

        this.size = size;

        this.insns = new SmallSet(insn, null);

    }

    public DataflowValue(final int size, final Set insns) {

        this.size = size;

        this.insns = insns;

    }

    public int getSize() {

        return size;

    }

    public boolean equals(final Object value) {

        DataflowValue v = (DataflowValue) value;

        return size == v.size && insns.equals(v.insns);

    }

    public int hashCode() {

        return insns.hashCode();

    }

}