140 lines
4.7 KiB
Java
140 lines
4.7 KiB
Java
/*******************************************************************************
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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.ipa.callgraph.propagation;
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import com.ibm.wala.classLoader.ArrayClass;
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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.classLoader.NewSiteReference;
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import com.ibm.wala.classLoader.ProgramCounter;
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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.propagation.cfa.CallerContext;
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import com.ibm.wala.ipa.callgraph.propagation.cfa.ContainerContextSelector;
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import com.ibm.wala.ipa.cha.IClassHierarchy;
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import com.ibm.wala.ssa.IR;
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import com.ibm.wala.ssa.SSANewInstruction;
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import com.ibm.wala.types.TypeReference;
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/**
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* A factory which tries by default to create {@link InstanceKey}s which are
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* {@link AllocationSiteInNode}s.
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*
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* Notes:
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* <ul>
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* <li>This class checks to avoid creating recursive contexts when
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* {@link CGNode}s are based on {@link ReceiverInstanceContext}, as in
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* object-sensitivity.
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* <li>Up till recursion, this class will happily create unlimited object
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* sensitivity, so be careful.
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* <li>This class resorts to {@link ClassBasedInstanceKeys} for exceptions from
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* PEIs and class objects.
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* <li>This class consults the {@link AnalysisOptions} to determine whether to
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* disambiguate individual constants.
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* </ul>
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*/
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public class AllocationSiteInNodeFactory implements InstanceKeyFactory {
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/**
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* Governing call graph construction options
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*/
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private final AnalysisOptions options;
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/**
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* Governing class hierarchy
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*/
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private final IClassHierarchy cha;
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private final ClassBasedInstanceKeys classBased;
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/**
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* @param options
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* Governing call graph construction options
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*/
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public AllocationSiteInNodeFactory(AnalysisOptions options, IClassHierarchy cha) {
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this.options = options;
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this.cha = cha;
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this.classBased = new ClassBasedInstanceKeys(options, cha);
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}
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@Override
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public InstanceKey getInstanceKeyForAllocation(CGNode node, NewSiteReference allocation) {
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IClass type = options.getClassTargetSelector().getAllocatedTarget(node, allocation);
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if (type == null) {
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return null;
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}
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CGNode nodeToUse = node;
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// disallow recursion in contexts.
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if (node.getContext().isA(ReceiverInstanceContext.class) ||
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node.getContext().isA(CallerContext.class)) {
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IMethod m = node.getMethod();
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CGNode n = ContainerContextSelector.findNodeRecursiveMatchingContext(m, node.getContext());
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if (n != null) {
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nodeToUse = n;
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}
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}
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if (type.isArrayClass()) {
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// special case for arrays with zero length in their first dimension
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IR ir = node.getIR();
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SSANewInstruction newInstruction = ir.getNew(allocation);
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int lengthVN = newInstruction.getUse(0);
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if (ir.getSymbolTable().isIntegerConstant(lengthVN)) {
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Integer c = (Integer) ir.getSymbolTable().getConstantValue(lengthVN);
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if (c.intValue() == 0) {
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if (options.getHandleZeroLengthArray()) {
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return new ZeroLengthArrayInNode(nodeToUse, allocation, type);
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} else {
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return new NormalAllocationInNode(nodeToUse, allocation, type);
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}
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}
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}
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}
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InstanceKey key = new NormalAllocationInNode(nodeToUse, allocation, type);
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return key;
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}
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@Override
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public InstanceKey getInstanceKeyForMultiNewArray(CGNode node, NewSiteReference allocation, int dim) {
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ArrayClass type = (ArrayClass) options.getClassTargetSelector().getAllocatedTarget(node, allocation);
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if (type == null) {
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return null;
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}
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InstanceKey key = new MultiNewArrayInNode(node, allocation, type, dim);
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return key;
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}
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@Override
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public <T> InstanceKey getInstanceKeyForConstant(TypeReference type, T S) {
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if (options.getUseConstantSpecificKeys()) {
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return new ConstantKey<>(S, cha.lookupClass(type));
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} else {
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return new ConcreteTypeKey(cha.lookupClass(type));
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}
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}
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@Override
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public InstanceKey getInstanceKeyForPEI(CGNode node, ProgramCounter pei, TypeReference type) {
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return classBased.getInstanceKeyForPEI(node, pei, type);
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}
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@Override
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public InstanceKey getInstanceKeyForMetadataObject(Object obj, TypeReference objType) {
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return classBased.getInstanceKeyForMetadataObject(obj, objType);
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}
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}
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