130 lines
3.2 KiB
Java
130 lines
3.2 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.ssa;
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import com.ibm.wala.shrikeBT.BinaryOpInstruction;
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import com.ibm.wala.shrikeBT.IBinaryOpInstruction;
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public abstract class SSABinaryOpInstruction extends SSAInstruction {
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private final int result;
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private final int val1;
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private final int val2;
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private final IBinaryOpInstruction.IOperator operator;
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/**
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* Might this instruction represent integer arithmetic?
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*/
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private final boolean mayBeInteger;
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protected SSABinaryOpInstruction(int index, IBinaryOpInstruction.IOperator operator, int result, int val1, int val2, boolean mayBeInteger) {
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super(index);
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this.result = result;
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this.val1 = val1;
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this.val2 = val2;
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this.operator = operator;
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this.mayBeInteger = mayBeInteger;
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if (val1 <= 0) {
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throw new IllegalArgumentException("illegal val1: " + val1);
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}
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if (val2 <= 0) {
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throw new IllegalArgumentException("illegal val2: " + val2);
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}
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}
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@Override
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public String toString(SymbolTable symbolTable) {
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return getValueString(symbolTable, result) + " = binaryop(" + operator + ") " + getValueString(symbolTable, val1) + " , "
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+ getValueString(symbolTable, val2);
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}
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/**
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* @see com.ibm.wala.ssa.SSAInstruction#visit(IVisitor)
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*/
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@Override
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public void visit(IVisitor v) throws NullPointerException {
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v.visitBinaryOp(this);
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}
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/**
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* Ugh. clean up shrike operator stuff.
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*/
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public IBinaryOpInstruction.IOperator getOperator() {
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return operator;
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}
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@Override
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public boolean hasDef() {
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return true;
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}
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@Override
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public int getDef() {
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return result;
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}
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@Override
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public int getDef(int i) {
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assert i == 0;
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return result;
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}
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/**
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* @see com.ibm.wala.ssa.SSAInstruction#getNumberOfUses()
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*/
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@Override
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public int getNumberOfDefs() {
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return 1;
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}
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@Override
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public int getNumberOfUses() {
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return 2;
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}
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/**
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* @see com.ibm.wala.ssa.SSAInstruction#getUse(int)
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*/
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@Override
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public int getUse(int j) {
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assert j <= 1;
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return (j == 0) ? val1 : val2;
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}
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@Override
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public int hashCode() {
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return 6311 * result ^ 2371 * val1 + val2;
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}
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/*
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* @see com.ibm.wala.ssa.Instruction#isPEI()
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*/
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@Override
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public boolean isPEI() {
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return mayBeInteger && (operator == BinaryOpInstruction.Operator.DIV || operator == BinaryOpInstruction.Operator.REM);
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}
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/*
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* @see com.ibm.wala.ssa.Instruction#isFallThrough()
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*/
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@Override
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public boolean isFallThrough() {
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return true;
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}
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public boolean mayBeIntegerOp() {
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return mayBeInteger;
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}
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}
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