145 lines
5.2 KiB
Java
145 lines
5.2 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.cast.js.ipa.callgraph;
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import com.ibm.wala.cast.js.types.JavaScriptTypes;
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import com.ibm.wala.cast.types.AstMethodReference;
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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.ContextItem;
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import com.ibm.wala.ipa.callgraph.ContextKey;
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import com.ibm.wala.ipa.callgraph.ContextSelector;
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import com.ibm.wala.ipa.callgraph.propagation.InstanceKey;
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import com.ibm.wala.ipa.callgraph.propagation.cfa.OneLevelSiteContextSelector;
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import com.ibm.wala.types.TypeName;
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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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*
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* @see <a
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* href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/Apply">MDN
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* Function.prototype.apply() docs</a>
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*/
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public class JavaScriptFunctionApplyContextSelector implements ContextSelector {
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/* whether to use a one-level callstring context in addition to the apply context */
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private static final boolean USE_ONE_LEVEL = true;
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private static final TypeName APPLY_TYPE_NAME = TypeName.findOrCreate("Lprologue.js/Function_prototype_apply");
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private static final TypeName CALL_TYPE_NAME = TypeName.findOrCreate("Lprologue.js/Function_prototype_call");
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public static final ContextKey APPLY_NON_NULL_ARGS = new ContextKey() {
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};
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private final ContextSelector base;
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private ContextSelector oneLevel;
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public JavaScriptFunctionApplyContextSelector(ContextSelector base) {
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this.base = base;
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// this.oneLevel = new nCFAContextSelector(1, base);
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this.oneLevel = new OneLevelSiteContextSelector(base);
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}
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public IntSet getRelevantParameters(CGNode caller, CallSiteReference site) {
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// 0 for function (synthetic apply), 1 for this (function being invoked), 2
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// for this arg of function being invoked,
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// 3 for arguments array
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if (caller.getIR().getCalls(site)[0].getNumberOfUses() >= 4) {
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return IntSetUtil.make(new int[] { 3 }).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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public static class ApplyContext implements Context {
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private final Context delegate;
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/**
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* was the argsList argument a non-null Array?
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*/
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private final ContextItem.Value<Boolean> isNonNullArray;
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@SuppressWarnings("unchecked")
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ApplyContext(Context delegate, boolean isNonNullArray) {
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this.delegate = delegate;
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this.isNonNullArray = ContextItem.Value.make(isNonNullArray);
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}
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public ContextItem get(ContextKey name) {
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if (APPLY_NON_NULL_ARGS.equals(name)) {
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return isNonNullArray;
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} else {
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return delegate.get(name);
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}
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + delegate.hashCode();
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result = prime * result + isNonNullArray.hashCode();
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (obj == null)
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return false;
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if (getClass() != obj.getClass())
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return false;
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ApplyContext other = (ApplyContext) obj;
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if (!delegate.equals(other.delegate))
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return false;
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if (!isNonNullArray.equals(other.isNonNullArray))
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return false;
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return true;
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}
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@Override
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public String toString() {
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return "ApplyContext [delegate=" + delegate + ", isNonNullArray=" + isNonNullArray + "]";
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}
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}
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public Context getCalleeTarget(CGNode caller, CallSiteReference site, IMethod callee, InstanceKey[] receiver) {
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IClass declaringClass = callee.getDeclaringClass();
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IMethod method = declaringClass.getMethod(AstMethodReference.fnSelector);
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Context baseCtxt = base.getCalleeTarget(caller, site, callee, receiver);
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if (method != null) {
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TypeName tn = method.getReference().getDeclaringClass().getName();
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if (tn.equals(APPLY_TYPE_NAME)) {
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boolean isNonNullArray = false;
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if (receiver.length >= 4) {
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InstanceKey argsList = receiver[3];
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if (argsList != null && argsList.getConcreteType().equals(caller.getClassHierarchy().lookupClass(JavaScriptTypes.Array))) {
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isNonNullArray = true;
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}
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}
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if (USE_ONE_LEVEL)
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baseCtxt = oneLevel.getCalleeTarget(caller, site, callee, receiver);
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return new ApplyContext(baseCtxt, isNonNullArray);
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} else if (USE_ONE_LEVEL && tn.equals(CALL_TYPE_NAME)) {
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return oneLevel.getCalleeTarget(caller, site, callee, receiver);
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}
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}
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return baseCtxt;
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}
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}
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