96 lines
4.2 KiB
Java
96 lines
4.2 KiB
Java
/******************************************************************************
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* Copyright (c) 2002 - 2014 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.cfg.exc;
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import com.ibm.wala.cfg.exc.inter.InterprocNullPointerAnalysis;
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import com.ibm.wala.cfg.exc.intra.ExplodedCFGNullPointerAnalysis;
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import com.ibm.wala.cfg.exc.intra.MethodState;
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import com.ibm.wala.cfg.exc.intra.ParameterState;
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import com.ibm.wala.cfg.exc.intra.SSACFGNullPointerAnalysis;
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import com.ibm.wala.ipa.callgraph.CallGraph;
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import com.ibm.wala.ssa.IR;
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import com.ibm.wala.ssa.ISSABasicBlock;
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import com.ibm.wala.ssa.SSAInstruction;
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import com.ibm.wala.ssa.analysis.IExplodedBasicBlock;
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import com.ibm.wala.types.TypeReference;
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import com.ibm.wala.util.CancelException;
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import com.ibm.wala.util.MonitorUtil.IProgressMonitor;
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import com.ibm.wala.util.WalaException;
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import com.ibm.wala.util.graph.GraphIntegrity.UnsoundGraphException;
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/**
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* Tries to detect impossible (or always appearing) NullPointerExceptions and removes impossible
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* control flow from the CFG.
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*
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* @author Juergen Graf <graf@kit.edu>
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*
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*/
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public final class NullPointerAnalysis {
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public static final TypeReference[] DEFAULT_IGNORE_EXCEPTIONS = {
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TypeReference.JavaLangOutOfMemoryError,
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TypeReference.JavaLangExceptionInInitializerError,
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TypeReference.JavaLangNegativeArraySizeException
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};
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private NullPointerAnalysis() {
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throw new IllegalStateException("No instances of this class allowed.");
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}
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public static ExceptionPruningAnalysis<SSAInstruction, IExplodedBasicBlock>
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createIntraproceduralExplodedCFGAnalysis(IR ir) {
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return createIntraproceduralExplodedCFGAnalysis(DEFAULT_IGNORE_EXCEPTIONS, ir, null, null);
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}
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public static ExceptionPruningAnalysis<SSAInstruction, IExplodedBasicBlock>
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createIntraproceduralExplodedCFGAnalysis(TypeReference[] ignoredExceptions, IR ir) {
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return createIntraproceduralExplodedCFGAnalysis(ignoredExceptions, ir, null, null);
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}
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public static ExceptionPruningAnalysis<SSAInstruction, IExplodedBasicBlock>
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createIntraproceduralExplodedCFGAnalysis(TypeReference[] ignoredExceptions, IR ir, ParameterState paramState, MethodState mState) {
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return new ExplodedCFGNullPointerAnalysis(ignoredExceptions, ir, paramState, mState);
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}
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public static ExceptionPruningAnalysis<SSAInstruction, ISSABasicBlock>
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createIntraproceduralSSACFGAnalyis(IR ir) {
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return createIntraproceduralSSACFGAnalyis(DEFAULT_IGNORE_EXCEPTIONS, ir, null, null);
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}
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public static ExceptionPruningAnalysis<SSAInstruction, ISSABasicBlock>
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createIntraproceduralSSACFGAnalyis(TypeReference[] ignoredExceptions, IR ir) {
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return createIntraproceduralSSACFGAnalyis(ignoredExceptions, ir, null, null);
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}
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public static ExceptionPruningAnalysis<SSAInstruction, ISSABasicBlock>
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createIntraproceduralSSACFGAnalyis(TypeReference[] ignoredExceptions, IR ir, ParameterState paramState, MethodState mState) {
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return new SSACFGNullPointerAnalysis(ignoredExceptions, ir, paramState, mState);
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}
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public static InterprocAnalysisResult<SSAInstruction, IExplodedBasicBlock>
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computeInterprocAnalysis(final CallGraph cg, final IProgressMonitor progress)
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throws WalaException, UnsoundGraphException, CancelException {
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return computeInterprocAnalysis(DEFAULT_IGNORE_EXCEPTIONS, cg, null, progress);
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}
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public static InterprocAnalysisResult<SSAInstruction, IExplodedBasicBlock>
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computeInterprocAnalysis(final TypeReference[] ignoredExceptions, final CallGraph cg,
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final MethodState defaultExceptionMethodState, final IProgressMonitor progress)
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throws WalaException, UnsoundGraphException, CancelException {
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final InterprocNullPointerAnalysis inpa = InterprocNullPointerAnalysis.compute(ignoredExceptions, cg,
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defaultExceptionMethodState, progress);
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return inpa.getResult();
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}
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}
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