90 lines
2.4 KiB
Java
90 lines
2.4 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.shrikeBT;
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/**
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* This instruction represents all return instructions.
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*/
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public final class ReturnInstruction extends Instruction {
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protected ReturnInstruction(short opcode) {
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this.opcode = opcode;
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}
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private static final ReturnInstruction[] preallocated = preallocate();
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private static final ReturnInstruction preallocatedVoid = new ReturnInstruction(OP_return);
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private static ReturnInstruction[] preallocate() {
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ReturnInstruction[] r = new ReturnInstruction[OP_areturn - OP_ireturn + 1];
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for (int i = 0; i < r.length; i++) {
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r[i] = new ReturnInstruction((short) (OP_ireturn + i));
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}
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return r;
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}
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public static ReturnInstruction make(String type) throws IllegalArgumentException {
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if (type == null) {
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throw new IllegalArgumentException("type is null");
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}
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if (type.equals(TYPE_void)) {
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return preallocatedVoid;
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} else {
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int t = Util.getTypeIndex(type);
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if (t < 0 || t > TYPE_Object_index) {
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throw new IllegalArgumentException("Cannot return type " + type);
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}
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return preallocated[t];
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}
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}
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@Override
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public boolean equals(Object o) {
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if (o instanceof ReturnInstruction) {
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ReturnInstruction i = (ReturnInstruction) o;
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return i.opcode == opcode;
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} else {
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return false;
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}
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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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@Override
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public int hashCode() {
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return opcode + 31111;
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}
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@Override
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public int getPoppedCount() {
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return opcode == OP_return ? 0 : 1;
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}
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public String getType() {
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return opcode == OP_return ? TYPE_void : indexedTypes[opcode - OP_ireturn];
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}
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@Override
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public void visit(Visitor v) throws NullPointerException {
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v.visitReturn(this);
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}
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@Override
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public String toString() {
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return "Return(" + getType() + ")";
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}
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public boolean isPEI() {
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return false;
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}
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} |