72 lines
1.7 KiB
Java
72 lines
1.7 KiB
Java
/*******************************************************************************
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* Copyright (c) 2002,2006 IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.shrikeBT;
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/**
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* PopInstructions pop one or two elements off the working stack.
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*/
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public final class PopInstruction extends Instruction {
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final private byte size;
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protected PopInstruction(byte size) {
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super((short) -1);
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this.size = size;
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}
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/**
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* @param size 1 or 2, the number of elements to pop
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*/
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public static PopInstruction make(int size) {
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if (size < 0 || size > 2) {
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throw new IllegalArgumentException("Invalid pop size: " + size);
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} else {
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return new PopInstruction((byte) size);
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}
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}
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@Override
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public boolean equals(Object o) {
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if (o instanceof PopInstruction) {
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PopInstruction i = (PopInstruction) o;
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return i.size == size;
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} else {
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return false;
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}
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}
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@Override
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public int hashCode() {
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return size + 8431890;
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}
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@Override
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public int getPoppedCount() {
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return size;
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}
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@Override
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public void visit(IInstruction.Visitor v) throws IllegalArgumentException {
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if (v == null) {
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throw new IllegalArgumentException();
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}
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v.visitPop(this);
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}
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@Override
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public String toString() {
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return "Pop(" + size + ")";
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}
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@Override
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public boolean isPEI() {
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return false;
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}
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} |