593 lines
21 KiB
Java
Executable File
593 lines
21 KiB
Java
Executable File
/******************************************************************************
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* Copyright (c) 2002 - 2006 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.net.URL;
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import java.util.Set;
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import com.ibm.wala.analysis.typeInference.TypeInference;
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import com.ibm.wala.cast.ipa.callgraph.AstSSAPropagationCallGraphBuilder;
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import com.ibm.wala.cast.ir.ssa.AstIsDefinedInstruction;
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import com.ibm.wala.cast.ir.ssa.EachElementHasNextInstruction;
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import com.ibm.wala.cast.js.analysis.typeInference.JSTypeInference;
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import com.ibm.wala.cast.js.ssa.InstructionVisitor;
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import com.ibm.wala.cast.js.ssa.JavaScriptCheckReference;
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import com.ibm.wala.cast.js.ssa.JavaScriptInstanceOf;
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import com.ibm.wala.cast.js.ssa.JavaScriptInvoke;
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import com.ibm.wala.cast.js.ssa.JavaScriptPropertyRead;
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import com.ibm.wala.cast.js.ssa.JavaScriptPropertyWrite;
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import com.ibm.wala.cast.js.ssa.JavaScriptTypeOfInstruction;
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import com.ibm.wala.cast.js.ssa.JavaScriptWithRegion;
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import com.ibm.wala.cast.js.types.JavaScriptTypes;
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import com.ibm.wala.classLoader.IClass;
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import com.ibm.wala.fixpoint.AbstractOperator;
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import com.ibm.wala.ipa.callgraph.AnalysisCache;
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import com.ibm.wala.ipa.callgraph.AnalysisOptions;
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import com.ibm.wala.ipa.callgraph.CGNode;
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import com.ibm.wala.ipa.callgraph.CallGraph;
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import com.ibm.wala.ipa.callgraph.impl.ExplicitCallGraph;
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import com.ibm.wala.ipa.callgraph.propagation.ConcreteTypeKey;
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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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import com.ibm.wala.ipa.callgraph.propagation.InstanceKey;
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import com.ibm.wala.ipa.callgraph.propagation.InstanceKeyFactory;
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import com.ibm.wala.ipa.callgraph.propagation.LocalPointerKey;
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import com.ibm.wala.ipa.callgraph.propagation.PointerAnalysis;
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import com.ibm.wala.ipa.callgraph.propagation.PointerKey;
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import com.ibm.wala.ipa.callgraph.propagation.PointerKeyFactory;
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import com.ibm.wala.ipa.callgraph.propagation.PointsToMap;
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import com.ibm.wala.ipa.callgraph.propagation.PointsToSetVariable;
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import com.ibm.wala.ipa.callgraph.propagation.PropagationCallGraphBuilder;
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import com.ibm.wala.ipa.callgraph.propagation.PropagationSystem;
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import com.ibm.wala.ipa.cha.IClassHierarchy;
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import com.ibm.wala.shrikeBT.BinaryOpInstruction;
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import com.ibm.wala.shrikeBT.IUnaryOpInstruction;
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import com.ibm.wala.ssa.DefUse;
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import com.ibm.wala.ssa.IR;
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import com.ibm.wala.ssa.SSAAbstractInvokeInstruction;
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import com.ibm.wala.ssa.SSABinaryOpInstruction;
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import com.ibm.wala.ssa.SSAUnaryOpInstruction;
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import com.ibm.wala.ssa.SymbolTable;
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import com.ibm.wala.util.collections.HashSetFactory;
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import com.ibm.wala.util.intset.IntSetAction;
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import com.ibm.wala.util.intset.MutableMapping;
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public class JSSSAPropagationCallGraphBuilder extends AstSSAPropagationCallGraphBuilder {
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public static final boolean DEBUG_LEXICAL = false;
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public static final boolean DEBUG_TYPE_INFERENCE = false;
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private URL scriptBaseURL;
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public URL getBaseURL() {
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return scriptBaseURL;
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}
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public void setBaseURL(URL url) {
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this.scriptBaseURL = url;
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}
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protected JSSSAPropagationCallGraphBuilder(IClassHierarchy cha, AnalysisOptions options, AnalysisCache cache,
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PointerKeyFactory pointerKeyFactory) {
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super(cha, options, cache, pointerKeyFactory);
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}
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protected boolean isConstantRef(SymbolTable symbolTable, int valueNumber) {
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if (valueNumber == -1) {
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return false;
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}
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return symbolTable.isConstant(valueNumber);
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}
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// ///////////////////////////////////////////////////////////////////////////
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//
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// language specialization interface
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//
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// ///////////////////////////////////////////////////////////////////////////
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protected boolean useObjectCatalog() {
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return true;
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}
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protected boolean isUncataloguedField(IClass type, String fieldName) {
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if (! type.getReference().equals(JavaScriptTypes.Object)) {
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return true;
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}
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return "prototype".equals(fieldName) || "constructor".equals(fieldName) || "arguments".equals(fieldName) || "class".equals(fieldName) || "$value".equals(fieldName);
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}
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// ///////////////////////////////////////////////////////////////////////////
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//
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// top-level node constraint generation
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//
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// ///////////////////////////////////////////////////////////////////////////
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protected ExplicitCallGraph createEmptyCallGraph(IClassHierarchy cha, AnalysisOptions options) {
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return new JSCallGraph(cha, options, getAnalysisCache());
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}
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protected TypeInference makeTypeInference(IR ir, IClassHierarchy cha) {
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TypeInference ti = new JSTypeInference(ir, cha);
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if (DEBUG_TYPE_INFERENCE) {
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System.err.println(("IR of " + ir.getMethod()));
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System.err.println(ir);
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System.err.println(("TypeInference of " + ir.getMethod()));
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for (int i = 0; i <= ir.getSymbolTable().getMaxValueNumber(); i++) {
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if (ti.isUndefined(i)) {
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System.err.println((" value " + i + " is undefined"));
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} else {
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System.err.println((" value " + i + " has type " + ti.getType(i)));
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}
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}
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}
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return ti;
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}
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protected void addAssignmentsForCatchPointerKey(PointerKey exceptionVar, Set catchClasses, PointerKey e) {
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system.newConstraint(exceptionVar, assignOperator, e);
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}
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public static class JSInterestingVisitor extends AstInterestingVisitor implements com.ibm.wala.cast.js.ssa.InstructionVisitor {
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public JSInterestingVisitor(int vn) {
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super(vn);
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}
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public void visitBinaryOp(final SSABinaryOpInstruction instruction) {
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bingo = true;
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}
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public void visitJavaScriptInvoke(JavaScriptInvoke instruction) {
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bingo = true;
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}
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public void visitJavaScriptPropertyRead(JavaScriptPropertyRead instruction) {
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bingo = true;
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}
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public void visitJavaScriptPropertyWrite(JavaScriptPropertyWrite instruction) {
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bingo = true;
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}
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public void visitTypeOf(JavaScriptTypeOfInstruction inst) {
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bingo = true;
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}
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public void visitJavaScriptInstanceOf(JavaScriptInstanceOf instruction) {
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bingo = true;
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}
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public void visitCheckRef(JavaScriptCheckReference instruction) {
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}
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public void visitWithRegion(JavaScriptWithRegion instruction) {
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}
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}
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protected InterestingVisitor makeInterestingVisitor(CGNode node, int vn) {
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return new JSInterestingVisitor(vn);
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}
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// ///////////////////////////////////////////////////////////////////////////
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//
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// specialized pointer analysis
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//
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// ///////////////////////////////////////////////////////////////////////////
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public static class JSPointerAnalysisImpl extends AstPointerAnalysisImpl {
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JSPointerAnalysisImpl(PropagationCallGraphBuilder builder, CallGraph cg, PointsToMap pointsToMap,
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MutableMapping<InstanceKey> instanceKeys, PointerKeyFactory pointerKeys, InstanceKeyFactory iKeyFactory) {
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super(builder, cg, pointsToMap, instanceKeys, pointerKeys, iKeyFactory);
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}
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public static class JSImplicitPointsToSetVisitor extends AstImplicitPointsToSetVisitor implements
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com.ibm.wala.cast.js.ssa.InstructionVisitor {
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public JSImplicitPointsToSetVisitor(AstPointerAnalysisImpl analysis, LocalPointerKey lpk) {
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super(analysis, lpk);
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}
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public void visitJavaScriptInvoke(JavaScriptInvoke instruction) {
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}
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public void visitTypeOf(JavaScriptTypeOfInstruction instruction) {
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}
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public void visitJavaScriptPropertyRead(JavaScriptPropertyRead instruction) {
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}
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public void visitJavaScriptPropertyWrite(JavaScriptPropertyWrite instruction) {
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}
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public void visitJavaScriptInstanceOf(JavaScriptInstanceOf instruction) {
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}
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public void visitCheckRef(JavaScriptCheckReference instruction) {
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}
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public void visitWithRegion(JavaScriptWithRegion instruction) {
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}
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};
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protected ImplicitPointsToSetVisitor makeImplicitPointsToVisitor(LocalPointerKey lpk) {
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return new JSImplicitPointsToSetVisitor(this, lpk);
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}
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};
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protected PropagationSystem makeSystem(AnalysisOptions options) {
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return new PropagationSystem(callGraph, pointerKeyFactory, instanceKeyFactory) {
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public PointerAnalysis makePointerAnalysis(PropagationCallGraphBuilder builder) {
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return new JSPointerAnalysisImpl(builder, cg, pointsToMap, instanceKeys, pointerKeyFactory, instanceKeyFactory);
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}
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};
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}
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// ///////////////////////////////////////////////////////////////////////////
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//
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// IR visitor specialization for JavaScript
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//
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// ///////////////////////////////////////////////////////////////////////////
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protected JSConstraintVisitor makeVisitor(CGNode node) {
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return new JSConstraintVisitor(this, node);
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}
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public static class JSConstraintVisitor extends AstConstraintVisitor implements InstructionVisitor {
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public JSConstraintVisitor(AstSSAPropagationCallGraphBuilder builder, CGNode node) {
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super(builder, node);
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}
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public void visitUnaryOp(SSAUnaryOpInstruction inst) {
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if (inst.getOpcode() == IUnaryOpInstruction.Operator.NEG) {
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int lval = inst.getDef(0);
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PointerKey lk = getPointerKeyForLocal(lval);
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IClass bool = getClassHierarchy().lookupClass(JavaScriptTypes.Boolean);
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InstanceKey key = new ConcreteTypeKey(bool);
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system.newConstraint(lk, key);
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}
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}
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public void visitIsDefined(AstIsDefinedInstruction inst) {
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int lval = inst.getDef(0);
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PointerKey lk = getPointerKeyForLocal(lval);
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IClass bool = getClassHierarchy().lookupClass(JavaScriptTypes.Boolean);
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InstanceKey key = new ConcreteTypeKey(bool);
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system.newConstraint(lk, key);
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}
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public void visitJavaScriptInstanceOf(JavaScriptInstanceOf inst) {
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int lval = inst.getDef(0);
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PointerKey lk = getPointerKeyForLocal(lval);
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IClass bool = getClassHierarchy().lookupClass(JavaScriptTypes.Boolean);
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InstanceKey key = new ConcreteTypeKey(bool);
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system.newConstraint(lk, key);
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}
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public void visitEachElementHasNext(EachElementHasNextInstruction inst) {
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int lval = inst.getDef(0);
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PointerKey lk = getPointerKeyForLocal(lval);
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IClass bool = getClassHierarchy().lookupClass(JavaScriptTypes.Boolean);
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InstanceKey key = new ConcreteTypeKey(bool);
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system.newConstraint(lk, key);
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}
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public void visitTypeOf(JavaScriptTypeOfInstruction instruction) {
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int lval = instruction.getDef(0);
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PointerKey lk = getPointerKeyForLocal(lval);
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IClass string = getClassHierarchy().lookupClass(JavaScriptTypes.String);
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InstanceKey key = new ConcreteTypeKey(string);
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system.newConstraint(lk, key);
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}
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public void visitBinaryOp(final SSABinaryOpInstruction instruction) {
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handleBinaryOp(instruction, node, symbolTable, du);
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}
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public void visitJavaScriptPropertyRead(JavaScriptPropertyRead instruction) {
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newFieldRead(node, instruction.getUse(0), instruction.getUse(1), instruction.getDef(0));
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}
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public void visitJavaScriptPropertyWrite(JavaScriptPropertyWrite instruction) {
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newFieldWrite(node, instruction.getUse(0), instruction.getUse(1), instruction.getUse(2));
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}
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public void visitJavaScriptInvoke(JavaScriptInvoke instruction) {
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visitInvokeInternal(instruction);
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}
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// ///////////////////////////////////////////////////////////////////////////
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//
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// string manipulation handling for binary operators
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//
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// ///////////////////////////////////////////////////////////////////////////
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private void handleBinaryOp(final SSABinaryOpInstruction instruction, final CGNode node, final SymbolTable symbolTable,
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final DefUse du) {
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int lval = instruction.getDef(0);
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PointerKey lk = getPointerKeyForLocal(lval);
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final PointsToSetVariable lv = system.findOrCreatePointsToSet(lk);
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final int arg1 = instruction.getUse(0);
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final int arg2 = instruction.getUse(1);
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class BinaryOperator extends AbstractOperator<PointsToSetVariable> {
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private CGNode getNode() {
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return node;
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}
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private SSABinaryOpInstruction getInstruction() {
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return instruction;
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}
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public String toString() {
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return "BinOp: " + getInstruction();
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}
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public int hashCode() {
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return 17 * getInstruction().getUse(0) * getInstruction().getUse(1);
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}
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public boolean equals(Object o) {
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if (o instanceof BinaryOperator) {
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BinaryOperator op = (BinaryOperator) o;
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return op.getNode().equals(getNode()) && op.getInstruction().getUse(0) == getInstruction().getUse(0)
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&& op.getInstruction().getUse(1) == getInstruction().getUse(1)
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&& op.getInstruction().getDef(0) == getInstruction().getDef(0);
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} else {
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return false;
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}
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}
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private InstanceKey[] getInstancesArray(int vn) {
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if (contentsAreInvariant(symbolTable, du, vn)) {
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return getInvariantContents(vn);
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} else {
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PointsToSetVariable v = system.findOrCreatePointsToSet(getPointerKeyForLocal(vn));
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if (v.getValue() == null || v.size() == 0) {
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return new InstanceKey[0];
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} else {
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final Set<InstanceKey> temp = HashSetFactory.make();
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v.getValue().foreach(new IntSetAction() {
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public void act(int keyIndex) {
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temp.add(system.getInstanceKey(keyIndex));
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}
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});
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return temp.toArray(new InstanceKey[temp.size()]);
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}
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}
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}
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private boolean isStringConstant(InstanceKey k) {
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return (k instanceof ConstantKey) && k.getConcreteType().getReference().equals(JavaScriptTypes.String);
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}
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private boolean addKey(InstanceKey k) {
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int n = system.findOrCreateIndexForInstanceKey(k);
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if (!lv.contains(n)) {
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lv.add(n);
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return true;
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} else {
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return false;
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}
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}
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public byte evaluate(PointsToSetVariable lhs, final PointsToSetVariable[] rhs) {
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boolean doDefault = false;
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byte changed = NOT_CHANGED;
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InstanceKey[] iks1 = getInstancesArray(arg1);
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InstanceKey[] iks2 = getInstancesArray(arg2);
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if ((instruction.getOperator() == BinaryOpInstruction.Operator.ADD) && (getOptions().getTraceStringConstants())) {
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for (int i = 0; i < iks1.length; i++) {
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if (isStringConstant(iks1[i])) {
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for (int j = 0; j < iks2.length; j++) {
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if (isStringConstant(iks2[j])) {
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String v1 = (String) ((ConstantKey) iks1[i]).getValue();
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String v2 = (String) ((ConstantKey) iks2[j]).getValue();
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if (v1.indexOf(v2) == -1 && v2.indexOf(v1) == -1) {
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InstanceKey lvalKey = getInstanceKeyForConstant(v1 + v2);
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if (addKey(lvalKey)) {
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changed = CHANGED;
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}
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} else {
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doDefault = true;
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}
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} else {
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doDefault = true;
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}
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}
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} else {
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doDefault = true;
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}
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}
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} else {
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doDefault = true;
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}
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if (doDefault) {
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for (int i = 0; i < iks1.length; i++) {
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if (addKey(new ConcreteTypeKey(iks1[i].getConcreteType()))) {
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changed = CHANGED;
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}
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}
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for (int i = 0; i < iks2.length; i++) {
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if (addKey(new ConcreteTypeKey(iks2[i].getConcreteType()))) {
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changed = CHANGED;
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}
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}
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}
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return changed;
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}
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}
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BinaryOperator B = new BinaryOperator();
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if (contentsAreInvariant(symbolTable, du, arg1)) {
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if (contentsAreInvariant(symbolTable, du, arg2)) {
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B.evaluate(null, null);
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} else {
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system.newConstraint(lk, B, getPointerKeyForLocal(arg2));
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}
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} else {
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PointerKey k1 = getPointerKeyForLocal(arg1);
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if (contentsAreInvariant(symbolTable, du, arg2)) {
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system.newConstraint(lk, B, k1);
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} else {
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system.newConstraint(lk, B, k1, getPointerKeyForLocal(arg2));
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}
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}
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}
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public void visitCheckRef(JavaScriptCheckReference instruction) {
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// TODO Auto-generated method stub
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}
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public void visitWithRegion(JavaScriptWithRegion instruction) {
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// TODO Auto-generated method stub
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}
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}
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/////////////////////////////////////////////////////////////////////////////
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//
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// function call handling
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//
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////////////////////////////////////////////////////////////////////////////
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@Override
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protected void processCallingConstraints(CGNode caller, SSAAbstractInvokeInstruction instruction, CGNode target,
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InstanceKey[][] constParams, PointerKey uniqueCatchKey) {
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IR sourceIR = getCFAContextInterpreter().getIR(caller);
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SymbolTable sourceST = sourceIR.getSymbolTable();
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IR targetIR = getCFAContextInterpreter().getIR(target);
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SymbolTable targetST = targetIR.getSymbolTable();
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JSConstraintVisitor targetVisitor = null;
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int av = -1;
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for (int v = 0; v <= targetST.getMaxValueNumber(); v++) {
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String[] vns = targetIR.getLocalNames(1, v);
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for (int n = 0; vns != null && n < vns.length; n++) {
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if ("arguments".equals(vns[n])) {
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av = v;
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targetVisitor = makeVisitor(target);
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break;
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}
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}
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}
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int paramCount = targetST.getParameterValueNumbers().length;
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int argCount = instruction.getNumberOfParameters();
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// pass actual arguments to formals in the normal way
|
|
for (int i = 0; i < Math.min(paramCount, argCount); i++) {
|
|
int fn = targetST.getConstant(i);
|
|
PointerKey F = getTargetPointerKey(target, i);
|
|
|
|
if (constParams != null && constParams[i] != null) {
|
|
for (int j = 0; j < constParams[i].length; j++) {
|
|
system.newConstraint(F, constParams[i][j]);
|
|
}
|
|
|
|
if (av != -1)
|
|
targetVisitor.newFieldWrite(target, av, fn, constParams[i]);
|
|
|
|
} else {
|
|
PointerKey A = getPointerKeyForLocal(caller, instruction.getUse(i));
|
|
system.newConstraint(F, (F instanceof FilteredPointerKey) ? filterOperator : assignOperator, A);
|
|
|
|
if (av != -1)
|
|
targetVisitor.newFieldWrite(target, av, fn, F);
|
|
}
|
|
}
|
|
|
|
// extra actual arguments get assigned into the ``arguments'' object
|
|
if (paramCount < argCount) {
|
|
if (av != -1) {
|
|
for (int i = paramCount; i < argCount; i++) {
|
|
int fn = targetST.getConstant(i);
|
|
if (constParams != null && constParams[i] != null) {
|
|
targetVisitor.newFieldWrite(target, av, fn, constParams[i]);
|
|
} else {
|
|
PointerKey A = getPointerKeyForLocal(caller, instruction.getUse(i));
|
|
targetVisitor.newFieldWrite(target, av, fn, A);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// extra formal parameters get null (extra args are ignored here)
|
|
else if (argCount < paramCount) {
|
|
int nullvn = sourceST.getNullConstant();
|
|
DefUse sourceDU = getCFAContextInterpreter().getDU(caller);
|
|
InstanceKey[] nullkeys = getInvariantContents(sourceST, sourceDU, caller, nullvn, this);
|
|
for (int i = argCount; i < paramCount; i++) {
|
|
PointerKey F = getPointerKeyForLocal(target, targetST.getParameter(i));
|
|
for (int k = 0; k < nullkeys.length; k++) {
|
|
system.newConstraint(F, nullkeys[k]);
|
|
}
|
|
}
|
|
}
|
|
|
|
// write `length' in argument objects
|
|
if (av != -1) {
|
|
int svn = targetST.getConstant(argCount);
|
|
int lnv = targetST.getConstant("length");
|
|
targetVisitor.newFieldWrite(target, av, lnv, svn);
|
|
}
|
|
|
|
// return values
|
|
if (instruction.getDef(0) != -1) {
|
|
PointerKey RF = getPointerKeyForReturnValue(target);
|
|
PointerKey RA = getPointerKeyForLocal(caller, instruction.getDef(0));
|
|
system.newConstraint(RA, assignOperator, RF);
|
|
}
|
|
|
|
PointerKey EF = getPointerKeyForExceptionalReturnValue(target);
|
|
if (SHORT_CIRCUIT_SINGLE_USES && uniqueCatchKey != null) {
|
|
// e has exactly one use. so, represent e implicitly
|
|
system.newConstraint(uniqueCatchKey, assignOperator, EF);
|
|
} else {
|
|
PointerKey EA = getPointerKeyForLocal(caller, instruction.getDef(1));
|
|
system.newConstraint(EA, assignOperator, EF);
|
|
}
|
|
}
|
|
|
|
|
|
}
|