123 lines
2.9 KiB
Java
123 lines
2.9 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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/**
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* SSA instruction representing v_x := arraylength v_y
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*/
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public abstract class SSAArrayLengthInstruction extends SSAInstruction {
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private final int result;
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private final int arrayref;
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protected SSAArrayLengthInstruction(int index, int result, int arrayref) {
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super(index);
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this.result = result;
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this.arrayref = arrayref;
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}
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@Override
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public SSAInstruction copyForSSA(SSAInstructionFactory insts, int[] defs, int[] uses) throws IllegalArgumentException {
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if (defs != null && defs.length != 1) {
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throw new IllegalArgumentException();
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}
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if (uses != null && uses.length != 1) {
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throw new IllegalArgumentException();
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}
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return insts.ArrayLengthInstruction(iindex, defs == null ? result : defs[0], uses == null ? arrayref : uses[0]);
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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, result) + " = arraylength " + getValueString(symbolTable, arrayref);
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}
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/**
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* @see com.ibm.wala.ssa.SSAInstruction#visit(IVisitor)
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*/
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@Override
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public void visit(IVisitor v) throws NullPointerException {
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v.visitArrayLength(this);
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}
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/**
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* @see com.ibm.wala.ssa.SSAInstruction#getDef()
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*/
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@Override
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public int getDef() {
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return result;
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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(int i) {
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if (i != 0) {
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throw new IllegalArgumentException("invalid i " + i);
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}
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return result;
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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 int getArrayRef() {
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return arrayref;
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}
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/**
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* @see com.ibm.wala.ssa.SSAInstruction#getNumberOfUses()
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*/
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@Override
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public int getNumberOfUses() {
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return 1;
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}
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/**
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* @see com.ibm.wala.ssa.SSAInstruction#getUse(int)
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*/
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@Override
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public int getUse(int j) {
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if (j != 0) {
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throw new IllegalArgumentException("invalid j: " + j);
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}
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return arrayref;
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}
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@Override
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public int hashCode() {
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return arrayref * 7573 + result * 563;
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}
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/*
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* @see com.ibm.wala.ssa.Instruction#isPEI()
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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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/*
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* @see com.ibm.wala.ssa.Instruction#isFallThrough()
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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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