100 lines
2.4 KiB
Java
100 lines
2.4 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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* This class represents goto and goto_w instructions.
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*/
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public final class GotoInstruction extends Instruction {
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private int[] label;
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protected GotoInstruction(int label) {
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int[] l = { label };
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this.label = l;
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this.opcode = OP_goto;
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}
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private final static GotoInstruction[] preallocated = preallocate();
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private static GotoInstruction[] preallocate() {
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GotoInstruction[] r = new GotoInstruction[256];
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for (int i = 0; i < r.length; i++) {
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r[i] = new GotoInstruction(i);
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}
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return r;
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}
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public static GotoInstruction make(int label) {
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if (0 <= label && label < preallocated.length) {
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return preallocated[label];
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} else {
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return new GotoInstruction(label);
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}
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}
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@Override
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public boolean isFallThrough() {
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return false;
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}
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@Override
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public int[] getBranchTargets() {
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return label;
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}
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public int getLabel() {
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return label[0];
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}
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@Override
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public Instruction redirectTargets(int[] targetMap) throws IllegalArgumentException {
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if (targetMap == null) {
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throw new IllegalArgumentException("targetMap is null");
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}
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try {
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return make(targetMap[label[0]]);
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} catch (ArrayIndexOutOfBoundsException e) {
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throw new IllegalArgumentException("Illegal target map", e);
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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 GotoInstruction) {
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GotoInstruction i = (GotoInstruction) o;
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return i.label == label;
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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 label[0] * 1348091 + 18301;
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}
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@Override
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public String toString() {
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return "Goto(" + getLabel() + ")";
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}
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@Override
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public void visit(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.visitGoto(this);
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}
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public boolean isPEI() {
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return false;
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}
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} |