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88 lines
2.5 KiB
88 lines
2.5 KiB
/* PrePostFixOperator Copyright (C) 1998-1999 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 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 General Public License
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* along with this program; see the file COPYING. 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 jode.expr;
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import jode.type.Type;
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import jode.decompiler.TabbedPrintWriter;
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public class PrePostFixOperator extends Operator {
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StoreInstruction store;
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boolean postfix;
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public PrePostFixOperator(Type type, int op,
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StoreInstruction store, boolean postfix) {
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super(type, op);
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this.store = store;
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this.postfix = postfix;
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}
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public int getPriority() {
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return postfix ? 800 : 700;
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}
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public Type getOperandType(int i) {
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return store.getLValueOperandType(i);
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}
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public int getOperandCount() {
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return store.getLValueOperandCount();
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}
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/**
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* Checks if the value of the given expression can change, due to
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* side effects in this expression. If this returns false, the
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* expression can safely be moved behind the current expresion.
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* @param expr the expression that should not change.
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*/
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public boolean hasSideEffects(Expression expr) {
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return store.hasSideEffects(expr);
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}
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/**
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* Sets the return type of this operator.
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*/
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public void setType(Type type) {
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store.setLValueType(type);
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super.setType(store.getLValueType());
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}
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public void setOperandType(Type[] inputTypes) {
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store.setLValueOperandType(inputTypes);
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}
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public void dumpExpression(TabbedPrintWriter writer,
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Expression[] operands)
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throws java.io.IOException {
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boolean needBrace = false;
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int priority = 700;
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if (postfix) {
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writer.print(getOperatorString());
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priority = 800;
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}
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if (store.getPriority() < priority) {
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needBrace = true;
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writer.print("(");
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}
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store.dumpLValue(writer, operands);
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if (needBrace)
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writer.print(")");
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if (!postfix)
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writer.print(getOperatorString());
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}
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}
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