128 lines
3.4 KiB
Java
128 lines
3.4 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 class represents instructions that convert from one primitive type to
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* another.
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*/
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public final class ConversionInstruction extends Instruction {
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private String fromType;
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private String toType;
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protected ConversionInstruction(short opcode) {
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this.opcode = opcode;
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if (opcode < OP_i2b) {
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int k = opcode - OP_i2l;
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toType = indexedTypes[skip(k % 3, k / 3)];
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} else {
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toType = indexedTypes[(opcode - OP_i2b) + TYPE_byte_index];
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}
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if (opcode < OP_i2b) {
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fromType = indexedTypes[(opcode - OP_i2l) / 3];
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} else {
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fromType = TYPE_int;
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}
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}
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private final static ConversionInstruction[] preallocated = preallocate();
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private static ConversionInstruction[] preallocate() {
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ConversionInstruction[] r = new ConversionInstruction[OP_i2s - OP_i2l + 1];
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for (short i = OP_i2l; i <= OP_i2s; i++) {
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r[i - OP_i2l] = new ConversionInstruction(i);
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}
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return r;
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}
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public static ConversionInstruction make(String fromType, String toType) throws IllegalArgumentException {
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int from = Util.getTypeIndex(fromType);
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int to = Util.getTypeIndex(toType);
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if (from < 0 || from > TYPE_double_index) {
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throw new IllegalArgumentException("Cannot convert from type " + fromType);
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}
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if (from == TYPE_int_index && (to >= TYPE_byte_index && to <= TYPE_short_index)) {
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return preallocated[(OP_i2b - OP_i2l) + (to - TYPE_byte_index)];
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} else {
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if (to < 0 || to > TYPE_double_index) {
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throw new IllegalArgumentException("Cannot convert from type " + fromType + " to type " + toType);
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}
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if (to == from) {
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throw new IllegalArgumentException("Cannot convert from type " + fromType + " to same type");
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}
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return preallocated[from * 3 + (to > from ? to - 1 : to)];
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}
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}
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@Override
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public int getPoppedCount() {
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return 1;
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}
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public String getFromType() {
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return fromType;
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}
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private static int skip(int a, int b) {
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return a < b ? a : a + 1;
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}
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public String getToType() {
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return toType;
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}
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@Override
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public String getPushedType(String[] types) {
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return getToType();
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}
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@Override
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public byte getPushedWordSize() {
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return Util.getWordSize(getToType());
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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 ConversionInstruction) {
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ConversionInstruction i = (ConversionInstruction) 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 int hashCode() {
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return opcode * 143111;
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}
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@Override
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public String toString() {
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return "Conversion(" + getFromType() + "," + getToType() + ")";
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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.visitConversion(this);
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}
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/*
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* (non-Javadoc)
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*
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* @see com.ibm.domo.cfg.IInstruction#isPEI()
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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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} |