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