119 lines
2.9 KiB
Java
119 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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* A return instruction.
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*/
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public class SSAReturnInstruction extends SSAInstruction {
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/**
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* value number of the result. By convention result == -1 means returns void.
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*/
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private final int result;
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private final boolean isPrimitive;
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public SSAReturnInstruction(int index, int result, boolean isPrimitive) {
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super(index);
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this.result = result;
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this.isPrimitive = isPrimitive;
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}
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public SSAReturnInstruction(int index) {
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super(index);
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this.result = -1;
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this.isPrimitive = false;
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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 (result == -1)
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return insts.ReturnInstruction(iindex);
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else {
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if (uses != null && uses.length != 1) {
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throw new IllegalArgumentException("invalid uses. must have exactly one use.");
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}
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return insts.ReturnInstruction(iindex, uses == null ? result : uses[0], isPrimitive);
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}
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}
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@Override
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public String toString(SymbolTable table) {
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if (result == -1) {
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return "return";
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} else {
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return "return " + getValueString(table, result);
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}
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}
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/**
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* @see com.ibm.wala.ssa.SSAInstruction#visit(IVisitor)
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* @throws IllegalArgumentException if v is null
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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.visitReturn(this);
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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 (result == -1) ? 0 : 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("illegal j: " + j);
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}
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return result;
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}
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/**
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* @return true iff this return instruction returns a primitive value
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*/
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public boolean returnsPrimitiveType() {
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return isPrimitive;
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}
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public int getResult() {
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return result;
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}
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public boolean returnsVoid() {
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return result == -1;
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}
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@Override
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public int hashCode() {
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return result * 8933;
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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 false;
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}
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}
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