108 lines
2.8 KiB
Java
108 lines
2.8 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.ssa;
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import com.ibm.wala.types.TypeReference;
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/**
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* An instruction that represents a reflective or meta-programming operation, like loadClass in Java
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*/
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public abstract class SSALoadMetadataInstruction extends SSAInstruction {
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private final int lval;
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/**
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* A representation of the meta-data itself. For a loadClass operation, this would be a {@link TypeReference} representing the
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* class object being manipulated
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*/
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private final Object token;
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/**
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* The type of the thing that this meta-data represents. For a loadClass instruction, entityType is java.lang.Class
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*/
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private final TypeReference entityType;
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protected SSALoadMetadataInstruction(int index, int lval, TypeReference entityType, Object token) {
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super(index);
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this.lval = lval;
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this.token = token;
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this.entityType = entityType;
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if (token == null) {
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throw new IllegalArgumentException("null typeRef");
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}
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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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if (defs != null && defs.length == 0) {
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throw new IllegalArgumentException("(defs != null) and (defs.length == 0)");
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}
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return insts.LoadMetadataInstruction(iindex, defs == null ? lval : defs[0], entityType, token);
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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) + " = load_metadata: " + token + ", " + entityType;
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}
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@Override
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public void visit(IVisitor v) {
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if (v == null) {
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throw new IllegalArgumentException("v is null");
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}
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v.visitLoadMetadata(this);
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}
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@Override
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public int hashCode() {
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return token.hashCode() * lval;
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}
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@Override
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public boolean isPEI() {
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return true;
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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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@Override
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public boolean isFallThrough() {
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return true;
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}
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public Object getToken() {
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return token;
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}
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public TypeReference getType() {
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return entityType;
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}
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}
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