313 lines
7.1 KiB
Java
313 lines
7.1 KiB
Java
package com.ibm.wala.analysis.nullpointer;
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import com.ibm.wala.ssa.SSAArrayLengthInstruction;
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import com.ibm.wala.ssa.SSAArrayLoadInstruction;
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import com.ibm.wala.ssa.SSAArrayStoreInstruction;
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import com.ibm.wala.ssa.SSABinaryOpInstruction;
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import com.ibm.wala.ssa.SSACheckCastInstruction;
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import com.ibm.wala.ssa.SSAComparisonInstruction;
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import com.ibm.wala.ssa.SSAConditionalBranchInstruction;
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import com.ibm.wala.ssa.SSAConversionInstruction;
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import com.ibm.wala.ssa.SSAGetCaughtExceptionInstruction;
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import com.ibm.wala.ssa.SSAGetInstruction;
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import com.ibm.wala.ssa.SSAGotoInstruction;
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import com.ibm.wala.ssa.SSAInstanceofInstruction;
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import com.ibm.wala.ssa.SSAInstruction;
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import com.ibm.wala.ssa.SSAInstruction.IVisitor;
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import com.ibm.wala.ssa.SSAInvokeInstruction;
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import com.ibm.wala.ssa.SSALoadMetadataInstruction;
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import com.ibm.wala.ssa.SSAMonitorInstruction;
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import com.ibm.wala.ssa.SSANewInstruction;
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import com.ibm.wala.ssa.SSAPhiInstruction;
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import com.ibm.wala.ssa.SSAPiInstruction;
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import com.ibm.wala.ssa.SSAPutInstruction;
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import com.ibm.wala.ssa.SSAReturnInstruction;
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import com.ibm.wala.ssa.SSASwitchInstruction;
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import com.ibm.wala.ssa.SSAThrowInstruction;
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import com.ibm.wala.ssa.SSAUnaryOpInstruction;
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/**
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* Helper class to find the variable that may be null.
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*
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* @author Stephan Gocht {@code <stephan@gobro.de>}
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*
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*/
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public class RelevantVariableFinder implements IVisitor {
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private int varNumNew;
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private final int varNum;
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public RelevantVariableFinder(SSAInstruction instrcution) {
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this.varNumNew = -1;
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instrcution.visit(this);
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this.varNum = this.varNumNew;
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}
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public int getVarNum() {
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return this.varNum;
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitArrayLength(com.ibm.wala
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* .ssa.SSAArrayLengthInstruction)
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*/
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@Override
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public void visitArrayLength(SSAArrayLengthInstruction instruction) {
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this.varNumNew = instruction.getArrayRef();
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitArrayLoad(com.ibm.wala.
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* ssa.SSAArrayLoadInstruction)
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*/
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@Override
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public void visitArrayLoad(SSAArrayLoadInstruction instruction) {
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this.varNumNew = instruction.getArrayRef();
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitArrayStore(com.ibm.wala
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* .ssa.SSAArrayStoreInstruction)
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*/
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@Override
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public void visitArrayStore(SSAArrayStoreInstruction instruction) {
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this.varNumNew = instruction.getArrayRef();
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitBinaryOp(com.ibm.wala.ssa
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* .SSABinaryOpInstruction)
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*/
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@Override
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public void visitBinaryOp(SSABinaryOpInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitCheckCast(com.ibm.wala.
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* ssa.SSACheckCastInstruction)
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*/
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@Override
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public void visitCheckCast(SSACheckCastInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitComparison(com.ibm.wala
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* .ssa.SSAComparisonInstruction)
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*/
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@Override
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public void visitComparison(SSAComparisonInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitConditionalBranch(com.ibm
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* .wala.ssa.SSAConditionalBranchInstruction)
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*/
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@Override
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public void visitConditionalBranch(
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SSAConditionalBranchInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitConversion(com.ibm.wala
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* .ssa.SSAConversionInstruction)
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*/
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@Override
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public void visitConversion(SSAConversionInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see com.ibm.wala.ssa.SSAInstruction.IVisitor#visitGet(com.ibm.wala.ssa.
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* SSAGetInstruction)
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*/
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@Override
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public void visitGet(SSAGetInstruction instruction) {
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if (!instruction.isStatic()) {
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this.varNumNew = instruction.getRef();
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}
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitGetCaughtException(com.
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* ibm.wala.ssa.SSAGetCaughtExceptionInstruction)
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*/
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@Override
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public void visitGetCaughtException(
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SSAGetCaughtExceptionInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see com.ibm.wala.ssa.SSAInstruction.IVisitor#visitGoto(com.ibm.wala.ssa.
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* SSAGotoInstruction)
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*/
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@Override
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public void visitGoto(SSAGotoInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitInstanceof(com.ibm.wala
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* .ssa.SSAInstanceofInstruction)
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*/
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@Override
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public void visitInstanceof(SSAInstanceofInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitInvoke(com.ibm.wala.ssa
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* .SSAInvokeInstruction)
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*/
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@Override
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public void visitInvoke(SSAInvokeInstruction instruction) {
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if (!instruction.isStatic()) {
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this.varNumNew = instruction.getReceiver();
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}
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitLoadMetadata(com.ibm.wala
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* .ssa.SSALoadMetadataInstruction)
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*/
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@Override
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public void visitLoadMetadata(SSALoadMetadataInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitMonitor(com.ibm.wala.ssa
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* .SSAMonitorInstruction)
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*/
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@Override
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public void visitMonitor(SSAMonitorInstruction instruction) {
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this.varNumNew = instruction.getRef();
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}
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/*
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* (non-Javadoc)
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*
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* @see com.ibm.wala.ssa.SSAInstruction.IVisitor#visitNew(com.ibm.wala.ssa.
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* SSANewInstruction)
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*/
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@Override
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public void visitNew(SSANewInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see com.ibm.wala.ssa.SSAInstruction.IVisitor#visitPhi(com.ibm.wala.ssa.
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* SSAPhiInstruction)
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*/
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@Override
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public void visitPhi(SSAPhiInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see com.ibm.wala.ssa.SSAInstruction.IVisitor#visitPi(com.ibm.wala.ssa.
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* SSAPiInstruction)
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*/
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@Override
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public void visitPi(SSAPiInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see com.ibm.wala.ssa.SSAInstruction.IVisitor#visitPut(com.ibm.wala.ssa.
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* SSAPutInstruction)
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*/
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@Override
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public void visitPut(SSAPutInstruction instruction) {
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if (!instruction.isStatic()) {
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this.varNumNew = instruction.getRef();
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}
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitReturn(com.ibm.wala.ssa
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* .SSAReturnInstruction)
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*/
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@Override
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public void visitReturn(SSAReturnInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitSwitch(com.ibm.wala.ssa
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* .SSASwitchInstruction)
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*/
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@Override
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public void visitSwitch(SSASwitchInstruction instruction) {
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitThrow(com.ibm.wala.ssa.
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* SSAThrowInstruction)
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*/
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@Override
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public void visitThrow(SSAThrowInstruction instruction) {
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this.varNumNew = instruction.getException();
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}
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/*
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* (non-Javadoc)
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*
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* @see
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* com.ibm.wala.ssa.SSAInstruction.IVisitor#visitUnaryOp(com.ibm.wala.ssa
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* .SSAUnaryOpInstruction)
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*/
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@Override
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public void visitUnaryOp(SSAUnaryOpInstruction instruction) {
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}
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}
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