299 lines
12 KiB
Java
299 lines
12 KiB
Java
/*
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* 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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* This file is a derivative of code released under the terms listed below.
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*
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*/
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/*
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* Copyright (c) 2013,
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* Tobias Blaschke <code@tobiasblaschke.de>
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* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The names of the contributors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.ibm.wala.dalvik.ipa.callgraph.androidModel.parameters;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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import java.util.logging.Logger;
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import com.ibm.wala.classLoader.IField;
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import com.ibm.wala.dalvik.ipa.callgraph.androidModel.AndroidModelClass;
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import com.ibm.wala.dalvik.util.AndroidEntryPointManager;
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import com.ibm.wala.dalvik.util.AndroidTypes;
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import com.ibm.wala.ipa.callgraph.AnalysisScope;
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import com.ibm.wala.ipa.cha.IClassHierarchy;
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import com.ibm.wala.ipa.summaries.VolatileMethodSummary;
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import com.ibm.wala.ssa.ConstantValue;
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import com.ibm.wala.ssa.SSAInstruction;
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import com.ibm.wala.types.Descriptor;
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import com.ibm.wala.types.MethodReference;
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import com.ibm.wala.types.TypeName;
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import com.ibm.wala.types.TypeReference;
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import com.ibm.wala.util.ssa.IInstantiator;
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import com.ibm.wala.util.ssa.ParameterAccessor;
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import com.ibm.wala.util.ssa.SSAValue;
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import com.ibm.wala.util.ssa.SSAValue.UniqueKey;
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import com.ibm.wala.util.ssa.SSAValue.VariableKey;
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import com.ibm.wala.util.ssa.SSAValueManager;
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import com.ibm.wala.util.ssa.TypeSafeInstructionFactory;
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/**
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* Instantiates certain android-types differently.
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*
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* For example instantiating an android.content.Context would pull in all Android-components in
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* scope resulting in a massivly overapproximated model.
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*
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* @author Tobias Blaschke <code@tobiasblaschke.de>
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*/
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public class SpecializedInstantiator extends FlatInstantiator {
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final IInstantiator parent;
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public SpecializedInstantiator(final VolatileMethodSummary body, final TypeSafeInstructionFactory instructionFactory,
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final SSAValueManager pm, final IClassHierarchy cha, final MethodReference scope, final AnalysisScope analysisScope,
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final IInstantiator parent) {
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super(body, instructionFactory, pm, cha, scope, analysisScope, 100);
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this.parent = parent;
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}
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/**
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* Creates a new instance of type calling all that's necessary.
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*
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* If T is a class-type all its constructors are searched for the one found best suited (takes the least arguments, ...).
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* New instances are created for all parameters, then the constructor is called.
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*
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* If T represents multiple types (is an interface, abstract class, ...) _all_ implementors of that type are instantiated
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* After that they get Phi-ed together.
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*
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* If T is an array-type a new array of length 1 is generated.
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*
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* @todo Do we want to mix in REUSE-Parameters?
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*/
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public SSAValue createInstance(final TypeReference T, final boolean asManaged, VariableKey key, Set<? extends SSAValue> seen) {
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return createInstance(T, asManaged, key, seen, 0);
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}
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/* package private */ SSAValue createInstance(final TypeReference T, final boolean asManaged, VariableKey key, Set<? extends SSAValue> seen, int currentDepth) {
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if (seen == null) {
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seen = new HashSet<SSAValue>();
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}
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if (currentDepth > this.maxDepth) {
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final SSAValue instance = this.pm.getUnmanaged(T, key);
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instance.setAssigned();
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return instance;
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}
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// final IClass klass = this.cha.lookupClass(T);
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{ // fetch new value
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if (asManaged) {
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if (key == null) {
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throw new IllegalArgumentException("A managed variable needs a key - null given.");
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}
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} else {
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if (key == null) {
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key = new UniqueKey();
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}
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}
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}
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assert(understands(T));
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if (T.equals(AndroidTypes.Context)) {
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return createContext(T, asManaged, key, seen);
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}
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if (T.equals(AndroidTypes.ContextWrapper)) {
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return createContextWrapper(T, asManaged, key, seen);
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}
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return null;
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}
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private static final Set<TypeReference> understandTypes = new HashSet<TypeReference>();
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static {
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understandTypes.add(AndroidTypes.Context);
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understandTypes.add(AndroidTypes.ContextWrapper);
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}
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public boolean understands(TypeReference T) {
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return understandTypes.contains(T);
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}
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// Now for the specialized types...
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/**
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* Creates a new instance of android/content/Context.
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*/
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public SSAValue createContext(final TypeReference T, final boolean asManaged, VariableKey key, Set<? extends SSAValue> seen) {
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final List<SSAValue> appComponents = new ArrayList<SSAValue>();
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{
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// TODO: Can we create a tighter conterxt?
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// TODO: Force an Application-Context?
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if (AndroidEntryPointManager.MANAGER.doFlatComponents()) {
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final AndroidModelClass mClass = AndroidModelClass.getInstance(cha);
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// At a given time context is expected to be only of one component already seen.
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// If it's seen there is a field in AndroidModelClass.
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for (final IField f : mClass.getAllFields()) {
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assert(f.isStatic()) : "All fields of AndroidModelClass are expected to be static! " + f + " is not.";
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final TypeReference fdType = f.getReference().getFieldType();
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{ // Test assignable
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if (! ParameterAccessor.isAssignable(fdType, T, cha) ) {
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assert(false) : "Unexpected but not fatal - remove assertion if this happens";
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continue;
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}
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}
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final VariableKey iKey = new SSAValue.TypeKey(fdType.getName());
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final SSAValue instance;
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if (this.pm.isSeen(iKey)) {
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instance = this.pm.getCurrent(iKey);
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} else {
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final int pc = this.body.getNextProgramCounter();
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final VariableKey subKey = new SSAValue.WeaklyNamedKey(fdType.getName(), "ctx" + fdType.getName().getClassName().toString());
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instance = this.pm.getUnallocated(fdType, subKey);
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final SSAInstruction getInst = instructionFactory.GetInstruction(pc, instance, f.getReference());
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this.body.addStatement(getInst);
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this.pm.setAllocation(instance, getInst);
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}
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appComponents.add(instance);
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}
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} else {
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for (TypeReference component : AndroidEntryPointManager.MANAGER.getComponents()) {
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final VariableKey iKey = new SSAValue.TypeKey(component.getName());
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if (this.pm.isSeen(iKey)) {
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final SSAValue instance;
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instance = this.pm.getCurrent(iKey);
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assert (instance.getNumber() > 0);
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appComponents.add(instance);
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}
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}
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}
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}
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final SSAValue instance;
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if ( appComponents.size() == 1) {
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instance = appComponents.get(0);
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} else if ( appComponents.size() > 0) {
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{ // Phi them together
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final int pc = this.body.getNextProgramCounter();
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instance = this.pm.getFree(T, key);
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assert (pc > 0);
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assert (instance.getNumber() > 0);
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final SSAInstruction phi = instructionFactory.PhiInstruction(pc, instance, appComponents);
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this.body.addStatement(phi);
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this.pm.setPhi(instance, phi);
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}
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} else {
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instance = this.pm.getUnmanaged(T, key);
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this.body.addConstant(instance.getNumber(), new ConstantValue(null));
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instance.setAssigned();
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}
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return instance;
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}
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public SSAValue createContextWrapper(final TypeReference T, final boolean asManaged, VariableKey key, Set<? extends SSAValue> seen) {
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final VariableKey contextKey = new SSAValue.TypeKey(AndroidTypes.ContextName);
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final SSAValue context;
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{
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if (this.pm.isSeen(contextKey)) {
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context = this.pm.getCurrent(contextKey);
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} else {
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context = createContext(AndroidTypes.Context, true, contextKey, seen);
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}
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}
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final SSAValue instance = this.pm.getUnallocated(T, key);
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{
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// call: ContextWrapper(Context base)
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final MethodReference ctor = MethodReference.findOrCreate(T, MethodReference.initAtom,
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Descriptor.findOrCreate(new TypeName[] { AndroidTypes.ContextName }, TypeReference.VoidName));
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final List<SSAValue> params = new ArrayList<SSAValue>();
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params.add(context);
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addCallCtor(instance, ctor, params);
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}
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return instance;
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}
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/**
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* Satisfy the interface.
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*/
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public int createInstance(TypeReference type, Object... instantiatorArgs) {
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// public SSAValue createInstance(final TypeReference T, final boolean asManaged, VariableKey key, Set<SSAValue> seen) {
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if (! (instantiatorArgs[0] instanceof Boolean)) {
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throw new IllegalArgumentException("Argument 0 to createInstance has to be boolean.");
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}
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if (! ((instantiatorArgs[1] == null) || (instantiatorArgs[1] instanceof VariableKey))) {
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throw new IllegalArgumentException("Argument 1 to createInstance has to be null or an instance of VariableKey");
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}
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if (! ((instantiatorArgs[2] == null) || (instantiatorArgs[2] instanceof Set))) {
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throw new IllegalArgumentException("Argument 2 to createInstance has to be null or an instance of Set<? extends SSAValue>, " +
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"got: " + instantiatorArgs[2].getClass());
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}
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final int currentDepth;
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{
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if (instantiatorArgs.length == 4) {
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currentDepth = (Integer) instantiatorArgs[3];
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} else {
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currentDepth = 0;
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}
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}
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if (instantiatorArgs[2] != null) {
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final Set seen = (Set) instantiatorArgs[2];
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if (! seen.isEmpty()) {
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final Object o = seen.iterator().next();
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if (! (o instanceof SSAValue)) {
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throw new IllegalArgumentException("Argument 2 to createInstance has to be null or an instance of Set<? extends SSAValue>, " +
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"got Set<" + o.getClass() + ">");
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}
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}
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}
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return createInstance(type, (Boolean) instantiatorArgs[0], (VariableKey) instantiatorArgs[1], (Set<? extends SSAValue>)
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instantiatorArgs[2], currentDepth).getNumber();
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}
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}
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