106 lines
2.8 KiB
Java
106 lines
2.8 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 local variable load instructions.
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*/
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public final class LoadInstruction extends Instruction {
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private int index;
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protected LoadInstruction(short opcode, int index) {
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this.index = index;
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this.opcode = opcode;
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}
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private final static LoadInstruction[] preallocated = preallocate();
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private static LoadInstruction[] preallocate() {
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LoadInstruction[] r = new LoadInstruction[5 * 16];
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for (int p = 0; p < 5; p++) {
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for (int i = 0; i < 4; i++) {
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r[p * 16 + i] = new LoadInstruction((short) (OP_iload_0 + i + p * 4), i);
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}
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for (int i = 4; i < 16; i++) {
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r[p * 16 + i] = new LoadInstruction((short) (OP_iload + p), i);
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}
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}
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return r;
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}
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public static LoadInstruction make(String type, int index) throws IllegalArgumentException {
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int t = Util.getTypeIndex(type);
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if (t < 0 || t > TYPE_Object_index) {
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throw new IllegalArgumentException("Cannot load local of type " + type);
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}
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if (index < 16) {
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return preallocated[t * 16 + index];
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} else {
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return new LoadInstruction((short) (OP_iload + t), index);
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}
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}
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/**
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* @return the index of the local variable loaded
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*/
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public int getVarIndex() {
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return index;
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}
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public String getType() {
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if (opcode < OP_iload_0) {
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return indexedTypes[opcode - OP_iload];
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} else {
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return indexedTypes[(opcode - OP_iload_0) / 4];
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}
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}
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@Override
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public String getPushedType(String[] types) {
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return getType();
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}
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@Override
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public byte getPushedWordSize() {
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return Util.getWordSize(getType());
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}
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@Override
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public void visit(Visitor v) throws NullPointerException {
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v.visitLocalLoad(this);
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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 LoadInstruction) {
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LoadInstruction i = (LoadInstruction) o;
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return i.index == index && i.opcode == opcode;
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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 opcode + index * 19801901;
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}
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@Override
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public String toString() {
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return "LocalLoad(" + getType() + "," + index + ")";
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}
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/* (non-Javadoc)
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* @see com.ibm.domo.cfg.IInstruction#isPEI()
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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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} |