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116 lines
3.4 KiB
116 lines
3.4 KiB
/* CompareUnaryOperator Copyright (C) 1998-2002 Jochen Hoenicke.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; see the file COPYING.LESSER. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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*/
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package net.sf.jode.expr;
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import net.sf.jode.type.Type;
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import net.sf.jode.decompiler.TabbedPrintWriter;
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public class CompareUnaryOperator extends Operator {
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boolean objectType;
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Type compareType;
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public CompareUnaryOperator(Type type, int op) {
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super(Type.tBoolean, op);
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compareType = type;
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objectType = (type.isOfType(Type.tUObject));
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initOperands(1);
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}
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public int getPriority() {
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switch (getOperatorIndex()) {
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case 26:
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case 27:
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return 500;
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case 28:
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case 29:
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case 30:
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case 31:
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return 550;
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}
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throw new RuntimeException("Illegal operator");
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}
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public Type getCompareType() {
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return compareType;
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}
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public void updateSubTypes() {
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subExpressions[0].setType(Type.tSubType(compareType));
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}
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public void updateType() {
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}
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public Expression simplify() {
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if (subExpressions[0] instanceof CompareToIntOperator) {
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CompareToIntOperator cmpOp
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= (CompareToIntOperator) subExpressions[0];
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boolean negated = false;
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int opIndex = getOperatorIndex();
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if (cmpOp.allowsNaN && getOperatorIndex() > NOTEQUALS_OP) {
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if (cmpOp.greaterOnNaN ==
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(opIndex == GREATEREQ_OP || opIndex == GREATER_OP)) {
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negated = true;
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opIndex ^= 1;
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}
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}
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Expression newOp = new CompareBinaryOperator
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(cmpOp.compareType, opIndex, cmpOp.allowsNaN)
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.addOperand(cmpOp.subExpressions[1])
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.addOperand(cmpOp.subExpressions[0]);
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if (negated)
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return newOp.negate().simplify();
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return newOp.simplify();
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}
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if (subExpressions[0].getType().isOfType(Type.tBoolean)) {
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/* xx == false */
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if (getOperatorIndex() == EQUALS_OP)
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return subExpressions[0].negate().simplify();
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/* xx != false */
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if (getOperatorIndex() == NOTEQUALS_OP)
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return subExpressions[0].simplify();
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}
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return super.simplify();
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}
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public Expression negate() {
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if ((getType() != Type.tFloat && getType() != Type.tDouble)
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|| getOperatorIndex() <= NOTEQUALS_OP) {
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setOperatorIndex(getOperatorIndex() ^ 1);
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return this;
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}
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return super.negate();
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}
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public boolean opEquals(Operator o) {
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return (o instanceof CompareUnaryOperator)
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&& o.getOperatorIndex() == getOperatorIndex();
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}
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public void dumpExpression(TabbedPrintWriter writer)
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throws java.io.IOException {
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subExpressions[0].dumpExpression(writer, getPriority()+1);
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writer.breakOp();
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writer.print(getOperatorString());
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writer.print(objectType?"null":"0");
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}
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}
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