150 lines
4.2 KiB
Java
150 lines
4.2 KiB
Java
/*******************************************************************************
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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.analysis.reflection;
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import com.ibm.wala.analysis.typeInference.PointType;
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import com.ibm.wala.analysis.typeInference.TypeAbstraction;
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import com.ibm.wala.classLoader.IClass;
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import com.ibm.wala.ipa.callgraph.Context;
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import com.ibm.wala.ipa.callgraph.ContextItem;
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import com.ibm.wala.ipa.callgraph.ContextKey;
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import com.ibm.wala.ipa.callgraph.propagation.ConstantKey;
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import com.ibm.wala.ipa.callgraph.propagation.FilteredPointerKey;
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/**
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* A context which may be used if
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* <ul>
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* <li>the method to be interpreted is either
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* {@link java.lang.Class#getMethod(String, Class...)} or
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* {@link java.lang.Class#getDeclaredMethod(String, Class...)},</li>
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* <li>the type of the "this" argument is known and</li>
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* <li>the value of the first argument (the method name) is a constant.</li>
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* </ul>
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*
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* In the special case described above,
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* {@link GetMethodContextInterpreter}
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* and
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* {@link GetMethodContextSelector}
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* should be preferred over
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* {@link JavaLangClassContextInterpreter}
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* and
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* {@link JavaLangClassContextSelector},
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* as
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* {@link GetMethodContextInterpreter}
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* and
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* {@link GetMethodContextSelector}
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* drastically reduce the number of methods returned increasing the precision of the analysis.
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* Thus,
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* {@link GetMethodContextInterpreter}
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* and
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* {@link GetMethodContextSelector}
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* should be placed in be placed in front of
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* {@link JavaLangClassContextInterpreter}
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* and
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* {@link JavaLangClassContextSelector}
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* .
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* @author Michael Heilmann
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* @see com.ibm.wala.analysis.reflection.GetMethodContextInterpreter
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* @see com.ibm.wala.analysis.reflection.GetMethodContextSelector
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* TODO Do the same for {@link Class#getField(String)} and {@link Class#getDeclaredField(String)}.
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*/
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public class GetMethodContext implements Context {
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/**
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* The type abstraction.
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*/
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private final TypeAbstraction type;
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/**
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* The method name.
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*/
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private final ConstantKey name;
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/**
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* Construct this GetMethodContext.
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* @param type the type
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* @param name the name of the method
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*/
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public GetMethodContext(TypeAbstraction type,ConstantKey name) {
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if (type == null) {
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throw new IllegalArgumentException("null == type");
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}
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this.type = type;
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if (name == null) {
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throw new IllegalArgumentException("null == name");
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}
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this.name = name;
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}
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class NameItem implements ContextItem {
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String name() { return getName(); }
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};
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@Override
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public ContextItem get(ContextKey name) {
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if (name == ContextKey.RECEIVER) {
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return type;
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} else if (name == ContextKey.NAME) {
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return new NameItem();
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} else if (name == ContextKey.PARAMETERS[0]) {
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if (type instanceof PointType) {
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IClass cls = ((PointType) type).getIClass();
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return new FilteredPointerKey.SingleClassFilter(cls);
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} else {
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return null;
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}
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} else if (name == ContextKey.PARAMETERS[1]) {
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return new FilteredPointerKey.SingleClassFilter(this.name.getConcreteType());
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} else {
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return null;
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}
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}
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@Override
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public String toString() {
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return "GetMethodContext<" + type + ", " + name + ">";
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}
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@Override
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public int hashCode() {
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return 6367 * type.hashCode() * name.hashCode();
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}
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@Override
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public boolean equals(Object obj) {
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if (obj == null) {
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return false;
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}
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if (getClass().equals(obj.getClass())) {
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GetMethodContext other = (GetMethodContext) obj;
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return type.equals(other.type) && name.equals(other.name);
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} else {
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return false;
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}
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}
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/**
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* Get the type.
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* @return the type
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*/
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public TypeAbstraction getType() {
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return type;
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}
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/**
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* Get the name.
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* @return the name
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*/
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public String getName() {
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return (String)name.getValue();
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}
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}
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