124 lines
3.3 KiB
Java
124 lines
3.3 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.IConditionalBranchInstruction;
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import com.ibm.wala.shrikeBT.IConditionalBranchInstruction.IOperator;
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import com.ibm.wala.types.TypeReference;
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/**
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* A conditional branch instruction, which tests two values according to some {@link IOperator}.
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*/
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public class SSAConditionalBranchInstruction extends SSAInstruction {
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private final IConditionalBranchInstruction.IOperator operator;
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private final int val1;
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private final int val2;
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private final TypeReference type;
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final private int target;
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public SSAConditionalBranchInstruction(int iindex, IConditionalBranchInstruction.IOperator operator, TypeReference type, int val1, int val2, int target)
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throws IllegalArgumentException {
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super(iindex);
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this.target = target;
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this.operator = operator;
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this.val1 = val1;
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this.val2 = val2;
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this.type = type;
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if (val1 <= 0) {
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throw new IllegalArgumentException("Invalid val1: " + val1);
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}
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if (val2 <= 0) {
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throw new IllegalArgumentException("Invalid val2: " + val2);
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}
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}
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public int getTarget() {
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return target;
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}
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@Override
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public SSAInstruction copyForSSA(SSAInstructionFactory insts, int[] defs, int[] uses) throws IllegalArgumentException {
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if (uses != null && uses.length < 2) {
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throw new IllegalArgumentException("(uses != null) and (uses.length < 2)");
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}
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return insts.ConditionalBranchInstruction(iindex, operator, type, uses == null ? val1 : uses[0], uses == null ? val2 : uses[1], target);
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}
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public IConditionalBranchInstruction.IOperator getOperator() {
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return operator;
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}
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@Override
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public String toString(SymbolTable symbolTable) {
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return "conditional branch(" + operator + ", to iindex=" + target + ") " + getValueString(symbolTable, val1) + "," + 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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* @throws IllegalArgumentException if v is null
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*/
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@Override
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public void visit(IVisitor v) {
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if (v == null) {
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throw new IllegalArgumentException("v is null");
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}
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v.visitConditionalBranch(this);
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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 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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public TypeReference getType() {
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return type;
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}
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public boolean isObjectComparison() {
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return type.isReferenceType();
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}
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public boolean isIntegerComparison() {
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return type == TypeReference.Int;
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}
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@Override
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public int hashCode() {
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return 7151 * val1 + val2;
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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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}
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