100 lines
3.9 KiB
Java
100 lines
3.9 KiB
Java
/*******************************************************************************
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* Copyright (c) 2008 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.analysis.reflection;
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import java.util.Collection;
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import com.ibm.wala.analysis.typeInference.PointType;
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import com.ibm.wala.classLoader.CallSiteReference;
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import com.ibm.wala.classLoader.IClass;
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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.propagation.ConstantKey;
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import com.ibm.wala.ipa.callgraph.propagation.InstanceKey;
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import com.ibm.wala.ipa.cha.IClassHierarchy;
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import com.ibm.wala.types.MethodReference;
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import com.ibm.wala.util.collections.HashSetFactory;
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import com.ibm.wala.util.intset.EmptyIntSet;
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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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/**
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* A {@link ContextSelector} to intercept calls to certain methods on java.lang.Class when the receiver is a type constant
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*
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* Currently supported methods:
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* <ul>
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* <li>getConstructor
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* <li>getConstructors
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* <li>getDeclaredMethod
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* <li>getMethods
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* </ul>
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*/
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class JavaLangClassContextSelector implements ContextSelector {
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public JavaLangClassContextSelector() {
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}
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/**
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* If the {@link CallSiteReference} invokes a method we understand and c is a type constant, return a {@link JavaTypeContext}
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* representing the type named by s, if we can resolve it in the {@link IClassHierarchy}.
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*/
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@Override
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public Context getCalleeTarget(CGNode caller, CallSiteReference site, IMethod callee, InstanceKey[] receiver) {
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if (receiver != null && receiver.length > 0 && mayUnderstand(caller, site, callee, receiver[0])) {
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return new JavaTypeContext(new PointType(getTypeConstant(receiver[0])));
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}
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return null;
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}
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private static IClass getTypeConstant(InstanceKey instance) {
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if (instance instanceof ConstantKey) {
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ConstantKey c = (ConstantKey) instance;
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if (c.getValue() instanceof IClass) {
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return (IClass) c.getValue();
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}
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}
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return null;
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}
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private static final Collection<MethodReference> UNDERSTOOD_METHOD_REFS = HashSetFactory.make();
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static {
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UNDERSTOOD_METHOD_REFS.add(JavaLangClassContextInterpreter.GET_CONSTRUCTOR);
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UNDERSTOOD_METHOD_REFS.add(JavaLangClassContextInterpreter.GET_CONSTRUCTORS);
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UNDERSTOOD_METHOD_REFS.add(JavaLangClassContextInterpreter.GET_METHOD);
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UNDERSTOOD_METHOD_REFS.add(JavaLangClassContextInterpreter.GET_METHODS);
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UNDERSTOOD_METHOD_REFS.add(JavaLangClassContextInterpreter.GET_DECLARED_CONSTRUCTOR);
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UNDERSTOOD_METHOD_REFS.add(JavaLangClassContextInterpreter.GET_DECLARED_CONSTRUCTORS);
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UNDERSTOOD_METHOD_REFS.add(JavaLangClassContextInterpreter.GET_DECLARED_METHOD);
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UNDERSTOOD_METHOD_REFS.add(JavaLangClassContextInterpreter.GET_DECLARED_METHODS);
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}
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/**
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* This object may understand a dispatch to Class.getContructor when the receiver is a type constant.
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*/
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private static boolean mayUnderstand(CGNode caller, CallSiteReference site, IMethod targetMethod, InstanceKey instance) {
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return UNDERSTOOD_METHOD_REFS.contains(targetMethod.getReference()) && getTypeConstant(instance) != null;
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}
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private static final IntSet thisParameter = IntSetUtil.make(new int[]{0});
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@Override
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public IntSet getRelevantParameters(CGNode caller, CallSiteReference site) {
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if (UNDERSTOOD_METHOD_REFS.contains(site.getDeclaredTarget())) {
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return thisParameter;
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} else {
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return EmptyIntSet.instance;
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}
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}
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}
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