91 lines
3.0 KiB
Java
91 lines
3.0 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.inter;
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import java.util.HashSet;
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import java.util.Set;
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import com.ibm.wala.cfg.ControlFlowGraph;
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import com.ibm.wala.ipa.callgraph.CGNode;
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import com.ibm.wala.ipa.callgraph.impl.FakeRootMethod;
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import com.ibm.wala.ssa.SSAAbstractInvokeInstruction;
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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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/**
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* Utility class for the exception pruning analysis.
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*
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* This class has been developed as part of a student project "Studienarbeit" by Markus Herhoffer.
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* It has been adapted and integrated into the WALA project by Juergen Graf.
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*
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* @author Markus Herhoffer <markus.herhoffer@student.kit.edu>
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* @author Juergen Graf <graf@kit.edu>
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*/
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public final class AnalysisUtil {
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private AnalysisUtil() {
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throw new IllegalStateException("No instances of this class allowed.");
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}
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/**
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* Checks if a node is FakeRoot
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*
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* @param node
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* the node to check
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* @return true if node is FakeRoot
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*/
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public static boolean isFakeRoot(CGNode node) {
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return (node.getMethod().getName().equals(FakeRootMethod.rootMethod.getName()));
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}
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/**
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* Returns an array of <code>int</code> with the parameter's var nums of the
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* invoked method in <code>invokeInstruction</code>.
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*
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* @param invokeInstruction
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* The instruction that invokes the method.
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* @return an array of <code>int</code> with all parameter's var nums
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* including the this pointer.
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*/
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public static int[] getParameterNumbers(SSAAbstractInvokeInstruction invokeInstruction) {
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final int number = invokeInstruction.getNumberOfParameters();
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final int[] parameterNumbers = new int[number];
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assert (parameterNumbers.length == invokeInstruction.getNumberOfUses());
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for (int i = 0; i < parameterNumbers.length; i++) {
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parameterNumbers[i] = invokeInstruction.getUse(i);
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}
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return parameterNumbers;
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}
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/**
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* Returns a Set of all blocks that invoke another method.
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*
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* @param cfg
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* The Control Flow Graph to analyze
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* @return a Set of all blocks that contain an invoke
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*/
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public static Set<IExplodedBasicBlock> extractInvokeBlocks(final ControlFlowGraph<SSAInstruction, IExplodedBasicBlock> cfg) {
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final HashSet<IExplodedBasicBlock> invokeBlocks = new HashSet<IExplodedBasicBlock>();
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for (final IExplodedBasicBlock block : cfg) {
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if (block.getInstruction() instanceof SSAAbstractInvokeInstruction) {
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invokeBlocks.add(block);
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}
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}
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return invokeBlocks;
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}
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}
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