83 lines
3.1 KiB
Java
Executable File
83 lines
3.1 KiB
Java
Executable File
/*******************************************************************************
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* Copyright (c) 2013 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.cast.js.ipa.callgraph;
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import java.util.HashMap;
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import com.ibm.wala.cast.ipa.callgraph.ArgumentInstanceContext;
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import com.ibm.wala.cast.ir.ssa.AstIRFactory;
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import com.ibm.wala.classLoader.CallSiteReference;
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import com.ibm.wala.classLoader.IMethod;
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import com.ibm.wala.ipa.callgraph.CGNode;
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import com.ibm.wala.ipa.callgraph.Context;
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import com.ibm.wala.ipa.callgraph.ContextSelector;
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import com.ibm.wala.ipa.callgraph.impl.Everywhere;
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import com.ibm.wala.ipa.callgraph.propagation.InstanceKey;
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import com.ibm.wala.ssa.IRFactory;
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import com.ibm.wala.ssa.SSAInstruction;
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import com.ibm.wala.ssa.SSAOptions;
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import com.ibm.wala.ssa.SSAReturnInstruction;
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import com.ibm.wala.types.MethodReference;
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import com.ibm.wala.util.collections.HashMapFactory;
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import com.ibm.wala.util.intset.IntSet;
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import com.ibm.wala.util.intset.IntSetUtil;
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public class ObjectSensitivityContextSelector implements ContextSelector {
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private final ContextSelector base;
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public ObjectSensitivityContextSelector(ContextSelector base) {
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this.base = base;
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}
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private final HashMap<MethodReference, Boolean> returnsThis_cache = HashMapFactory.make();
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private final IRFactory<IMethod> factory = AstIRFactory.makeDefaultFactory();
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// determine whether the method returns "this"
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private boolean returnsThis(IMethod method) {
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MethodReference mref = method.getReference();
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if(method.getNumberOfParameters() < 1)
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return false;
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Boolean b = returnsThis_cache.get(mref);
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if(b != null)
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return b;
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for(SSAInstruction inst : factory.makeIR(method, Everywhere.EVERYWHERE, SSAOptions.defaultOptions()).getInstructions()) {
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if(inst instanceof SSAReturnInstruction) {
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SSAReturnInstruction ret = (SSAReturnInstruction)inst;
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if(ret.getResult() == 2) {
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returnsThis_cache.put(mref, true);
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return true;
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}
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}
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}
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returnsThis_cache.put(mref, false);
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return false;
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}
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public Context getCalleeTarget(CGNode caller, CallSiteReference site, IMethod callee, InstanceKey[] arguments) {
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Context baseContext = base.getCalleeTarget(caller, site, callee, arguments);
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if(returnsThis(callee)) {
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if(arguments.length > 1 && arguments[1] != null) {
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return new ArgumentInstanceContext(baseContext, 1, arguments[1]);
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}
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}
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return baseContext;
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}
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public IntSet getRelevantParameters(CGNode caller, CallSiteReference site) {
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if (caller.getIR().getCalls(site)[0].getNumberOfUses() > 1) {
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return IntSetUtil.make(new int[]{1}).union(base.getRelevantParameters(caller, site));
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} else {
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return base.getRelevantParameters(caller, site);
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}
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}
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} |