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136 lines
4.7 KiB
136 lines
4.7 KiB
/* IfThenElseOperator 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.bytecode.ClassPath;
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import net.sf.jode.decompiler.FieldAnalyzer;
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import net.sf.jode.decompiler.TabbedPrintWriter;
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public class IfThenElseOperator extends Operator {
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public IfThenElseOperator(Type type) {
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super(type, 0);
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initOperands(3);
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}
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public int getPriority() {
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return 200;
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}
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public void updateSubTypes() {
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subExpressions[0].setType(Type.tBoolean);
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subExpressions[1].setType(Type.tSubType(type));
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subExpressions[2].setType(Type.tSubType(type));
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}
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public void updateType() {
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Type commonType = Type.tSuperType(subExpressions[1].getType())
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.intersection(Type.tSuperType(subExpressions[2].getType()));
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updateParentType(commonType);
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}
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public Expression simplify() {
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if (getType().isOfType(Type.tBoolean)) {
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if (subExpressions[1] instanceof ConstOperator
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&& subExpressions[2] instanceof ConstOperator) {
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ConstOperator c1 = (ConstOperator) subExpressions[1];
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ConstOperator c2 = (ConstOperator) subExpressions[2];
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if (c1.getValue().equals(new Integer(1)) &&
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c2.getValue().equals(new Integer(0)))
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return subExpressions[0].simplify();
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if (c2.getValue().equals(new Integer(1)) &&
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c1.getValue().equals(new Integer(0)))
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return subExpressions[0].negate().simplify();
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}
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}
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if (subExpressions[0] instanceof CompareUnaryOperator
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&& ((((CompareUnaryOperator) subExpressions[0])
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.getOperatorIndex() & ~1) == Operator.COMPARE_OP)) {
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CompareUnaryOperator cmp
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= (CompareUnaryOperator) subExpressions[0];
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int cmpType = cmp.getOperatorIndex() & 1;
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if ((subExpressions[2 - cmpType] instanceof GetFieldOperator)
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&& (subExpressions[1 + cmpType] instanceof StoreInstruction)) {
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// Check for
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// class$classname != null ? class$classname :
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// (class$classname = class$("classname"))
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// and replace with
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// classname.class
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GetFieldOperator get
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= (GetFieldOperator) subExpressions[2 - cmpType];
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StoreInstruction put
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= (StoreInstruction) subExpressions[1 + cmpType];
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FieldAnalyzer field;
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if (put.getLValue() instanceof PutFieldOperator
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&& ((field = ((PutFieldOperator)put.getLValue())
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.getField()) != null) && field.isSynthetic()
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&& put.lvalueMatches(get)
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&& (cmp.subExpressions[0] instanceof GetFieldOperator)
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&& put.lvalueMatches((GetFieldOperator)
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cmp.subExpressions[0])
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&& put.subExpressions[1] instanceof InvokeOperator) {
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InvokeOperator invoke = (InvokeOperator)
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put.subExpressions[1];
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if (invoke.isGetClass()
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&& invoke.subExpressions[0] instanceof ConstOperator
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&& (invoke.subExpressions[0].getType()
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.equals(Type.tString))) {
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String clazz = (String)
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((ConstOperator)invoke.subExpressions[0])
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.getValue();
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ClassPath cp = field.getClassAnalyzer().getClassPath();
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if (field.setClassConstant(clazz))
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return new ClassFieldOperator
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(clazz.charAt(0) == '['
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? Type.tType(cp, clazz)
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: Type.tClass(cp, clazz));
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}
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}
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}
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}
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return super.simplify();
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}
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public boolean opEquals(Operator o) {
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return (o instanceof IfThenElseOperator);
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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, 201);
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writer.breakOp();
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writer.print(" ? ");
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int subPriority = 0;
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if (!subExpressions[1].getType().getHint().isOfType
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(subExpressions[2].getType())) {
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writer.startOp(TabbedPrintWriter.IMPL_PAREN, 2);
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/* We need a cast here */
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writer.print("(");
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writer.printType(getType().getHint());
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writer.print(") ");
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subPriority = 700;
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}
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subExpressions[1].dumpExpression(writer, subPriority);
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if (subPriority == 700)
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writer.endOp();
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writer.breakOp();
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writer.print(" : ");
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subExpressions[2].dumpExpression(writer, 200);
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}
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}
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