135 lines
3.9 KiB
Java
135 lines
3.9 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 binary operator instructions for which the operands and the result all have the same type.
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*/
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final public class BinaryOpInstruction extends Instruction implements IBinaryOpInstruction {
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protected BinaryOpInstruction(short opcode) {
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super(opcode);
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}
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private final static BinaryOpInstruction[] arithmeticOps = preallocateArithmeticOps();
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private final static BinaryOpInstruction[] logicalOps = preallocateLogicalOps();
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private static BinaryOpInstruction[] preallocateArithmeticOps() {
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BinaryOpInstruction[] r = new BinaryOpInstruction[OP_drem - OP_iadd + 1];
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for (short i = OP_iadd; i <= OP_drem; i++) {
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r[i - OP_iadd] = new BinaryOpInstruction(i);
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}
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return r;
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}
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private static BinaryOpInstruction[] preallocateLogicalOps() {
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BinaryOpInstruction[] r = new BinaryOpInstruction[OP_lxor - OP_iand + 1];
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for (short i = OP_iand; i <= OP_lxor; i++) {
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r[i - OP_iand] = new BinaryOpInstruction(i);
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}
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return r;
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}
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public static BinaryOpInstruction make(String type, Operator operator) throws IllegalArgumentException {
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if (operator == null) {
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throw new IllegalArgumentException("operator is null");
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}
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int t = Util.getTypeIndex(type);
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if (t < 0) {
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throw new IllegalArgumentException("Invalid type for BinaryOp: " + type);
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}
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if (operator.compareTo(Operator.REM) <= 0) {
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if (t > TYPE_double_index) {
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throw new IllegalArgumentException("Invalid type for BinaryOp: " + type);
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}
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return arithmeticOps[(operator.ordinal() - Operator.ADD.ordinal()) * 4 + t];
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} else {
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if (t > TYPE_long_index) {
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throw new IllegalArgumentException("Cannot use logical binaryOps on floating point type: " + type);
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}
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return logicalOps[(operator.ordinal() - Operator.AND.ordinal()) * 2 + t];
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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 BinaryOpInstruction) {
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BinaryOpInstruction i = (BinaryOpInstruction) 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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public Operator getOperator() {
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if (opcode < OP_iand) {
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// For these opcodes, there are 4 variants (i,l,f,d)
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return Operator.values()[(opcode - OP_iadd) / 4];
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} else {
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// For these opcodes there are 2 variants (i,l)
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// Note that AND is values()[5]
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return Operator.values()[5 + (opcode - OP_iand) / 2];
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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 + 13901901;
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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 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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public String getType() {
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int t;
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if (opcode < OP_iand) {
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t = (opcode - OP_iadd) & 3;
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} else {
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t = (opcode - OP_iand) & 1;
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}
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return indexedTypes[t];
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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.visitBinaryOp(this);
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}
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@Override
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public String toString() {
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return "BinaryOp(" + getType() + "," + getOperator() + ")";
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}
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public boolean isPEI() {
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return opcode == Constants.OP_idiv || opcode == Constants.OP_ldiv || opcode == Constants.OP_irem || opcode == Constants.OP_lrem;
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}
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public boolean throwsExceptionOnOverflow() {
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return false;
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}
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public boolean isUnsigned() {
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return false;
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}
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} |