96 lines
2.5 KiB
Java
96 lines
2.5 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.java.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.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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* The CAst source language front end for Java has explicit support for lexically-enclosing objects, rather than compiling them
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* away into extra fields and access-control thwarting accessor methods as is done in bytecode. This instruction represents a read
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* of the object of the given type that lexically encloses its use value.
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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 EnclosingObjectReference extends SSAInstruction {
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private final TypeReference type;
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private final int lval;
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public EnclosingObjectReference(int iindex, int lval, TypeReference type) {
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super(iindex);
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this.lval = lval;
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this.type = type;
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}
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@Override
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public boolean hasDef() {
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return true;
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}
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@Override
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public int getDef() {
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return lval;
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}
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@Override
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public int getDef(int i) {
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assert i == 0;
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return lval;
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}
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@Override
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public int getNumberOfDefs() {
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return 1;
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}
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public TypeReference getEnclosingType() {
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return type;
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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 ((AstJavaInstructionFactory) insts).EnclosingObjectReference(iindex, defs == null ? lval : defs[0], type);
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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, lval) + " = enclosing " + type.getName();
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}
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@Override
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public void visit(IVisitor v) {
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((AstJavaInstructionVisitor) v).visitEnclosingObjectReference(this);
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}
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@Override
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public int hashCode() {
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return lval * type.hashCode();
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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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