133 lines
3.6 KiB
Java
133 lines
3.6 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 comparisons between floats, longs and doubles.
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*/
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final public class ComparisonInstruction extends Instruction implements IComparisonInstruction {
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protected ComparisonInstruction(short opcode) {
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super(opcode);
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}
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private final static ComparisonInstruction preallocatedLCMP = new ComparisonInstruction(OP_lcmp);
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private final static ComparisonInstruction[] preallocatedFloatingCompares = preallocateFloatingCompares();
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private static ComparisonInstruction[] preallocateFloatingCompares() {
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ComparisonInstruction[] r = new ComparisonInstruction[OP_dcmpg - OP_fcmpl + 1];
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for (short i = OP_fcmpl; i <= OP_dcmpg; i++) {
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r[i - OP_fcmpl] = new ComparisonInstruction(i);
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}
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return r;
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}
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public static ComparisonInstruction make(String type, Operator operator) throws IllegalArgumentException {
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int t = Util.getTypeIndex(type);
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switch (t) {
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case TYPE_long_index:
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if (operator != Operator.CMP) {
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throw new IllegalArgumentException("Operator " + operator + " is not a valid comparison operator for longs");
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} else {
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return preallocatedLCMP;
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}
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case TYPE_float_index:
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case TYPE_double_index:
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if (operator == Operator.CMP) {
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throw new IllegalArgumentException("Operator " + operator + " is not a valid comparison operator for floating point values");
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} else {
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return preallocatedFloatingCompares[(operator.ordinal() - Operator.CMPL.ordinal()) + (t - TYPE_float_index) * 2];
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}
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default:
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throw new IllegalArgumentException("Type " + type + " cannot be compared");
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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 ComparisonInstruction) {
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ComparisonInstruction i = (ComparisonInstruction) o;
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return 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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/**
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* @return OPR_cmp (for long), OPR_cmpl, or OPR_cmpg (for float and double)
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*/
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@Override
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public Operator getOperator() {
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switch (opcode) {
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case OP_lcmp:
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return Operator.CMP;
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case OP_fcmpl:
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case OP_dcmpl:
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return Operator.CMPL;
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case OP_dcmpg:
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case OP_fcmpg:
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return Operator.CMPG;
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default:
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throw new Error("Unknown opcode");
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}
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}
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@Override
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public String getType() {
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switch (opcode) {
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case OP_lcmp:
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return TYPE_long;
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case OP_fcmpg:
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case OP_fcmpl:
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return TYPE_float;
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case OP_dcmpl:
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case OP_dcmpg:
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return TYPE_double;
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default:
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throw new Error("Unknown opcode");
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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 + 1391901;
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}
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@Override
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public int getPoppedCount() {
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return 2;
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}
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@Override
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public String getPushedType(String[] types) {
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return Constants.TYPE_boolean;
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}
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@Override
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public byte getPushedWordSize() {
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return 1;
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}
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@Override
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public void visit(IInstruction.Visitor v) throws NullPointerException {
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v.visitComparison(this);
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}
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@Override
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public String toString() {
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return "Comparison(" + getType() + "," + getOperator() + ")";
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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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} |