63 lines
2.3 KiB
Java
63 lines
2.3 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.cast.ir.ssa;
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import java.util.Collection;
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import java.util.Collections;
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import com.ibm.wala.ssa.SSAAbstractBinaryInstruction;
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import com.ibm.wala.ssa.SSAInstruction;
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import com.ibm.wala.ssa.SSAInstructionFactory;
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import com.ibm.wala.ssa.SymbolTable;
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import com.ibm.wala.types.TypeReference;
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/**
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* This instruction represents iterating through the properties of its receiver object. The use represents an object,
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* and the l-value represents one of a sequence of property names, suitable for use with the appropriate
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* AbstractReflectiveGet sub-class.
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*
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* Iterating across the fields or properties of a given object is a common idiom in scripting languages, which is why
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* the IR has first-class support for it.
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*
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* @author Julian Dolby (dolby@us.ibm.com)
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*/
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public class EachElementGetInstruction extends SSAAbstractBinaryInstruction {
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public EachElementGetInstruction(int iindex, int lValue, int objectRef, int previousProp) {
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super(iindex, lValue, objectRef, previousProp);
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}
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@Override
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public SSAInstruction copyForSSA(SSAInstructionFactory insts, int[] defs, int[] uses) {
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return ((AstInstructionFactory)insts).EachElementGetInstruction(iindex, (defs == null) ? getDef(0) : defs[0], (uses == null) ? getUse(0) : uses[0], (uses == null) ? getUse(1) : uses[1]);
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}
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@Override
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public String toString(SymbolTable symbolTable) {
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return getValueString(symbolTable, getDef(0)) + " = a property name of " + getValueString(symbolTable, getUse(0));
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}
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@Override
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public void visit(IVisitor v) {
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((AstInstructionVisitor) v).visitEachElementGet(this);
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}
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@Override
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public Collection<TypeReference> getExceptionTypes() {
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return Collections.emptySet();
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}
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@Override
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public boolean isFallThrough() {
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return true;
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}
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}
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