PrefixOp.java

/*
 * @(#) $(JCGO)/jtrsrc/com/ivmaisoft/jcgo/PrefixOp.java --
 * a part of JCGO translator.
 **
 * Project: JCGO (http://www.ivmaisoft.com/jcgo/)
 * Copyright (C) 2001-2012 Ivan Maidanski <ivmai@mail.ru>
 * All rights reserved.
 */

/*
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 **
 * This software is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License (GPL) for more details.
 **
 * Linking this library statically or dynamically with other modules is
 * making a combined work based on this library. Thus, the terms and
 * conditions of the GNU General Public License cover the whole
 * combination.
 **
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent
 * modules, and to copy and distribute the resulting executable under
 * terms of your choice, provided that you also meet, for each linked
 * independent module, the terms and conditions of the license of that
 * module. An independent module is a module which is not derived from
 * or based on this library. If you modify this library, you may extend
 * this exception to your version of the library, but you are not
 * obligated to do so. If you do not wish to do so, delete this
 * exception statement from your version.
 */

package com.ivmaisoft.jcgo;

/**
 * Grammar production for prefix increment and decrement operations.
 ** 
 * Formats: INCREMENT UnaryExpression DECREMENT UnaryExpression
 */

final class PrefixOp extends LexNode {

    PrefixOp(Term a, Term b) {
        super(a, b);
    }

    void processPass1(Context c) {
        c.lvalue = true;
        terms[1].processPass1(c);
        c.lvalue = false;
        int s1 = terms[1].exprType().objectSize();
        if (s1 < Type.BYTE || s1 > Type.DOUBLE) {
            fatalError(c, "Inappropriate type in unary expression");
        }
    }

    ExpressionType exprType() {
        return terms[1].exprType();
    }

    void processOutput(OutputContext oc) {
        VariableDefinition v = terms[1].getVariable(true);
        if (v != null && v.isThreadVolatile()) {
            oc.cPrint(terms[0].getSym() == LexTerm.INCREMENT ? "JCGO_VLT_PREINC"
                    : "JCGO_VLT_PREDECR");
            oc.cPrint(Type.sig[terms[1].exprType().objectSize()]);
            oc.cPrint("(");
            terms[1].processOutput(oc);
            oc.cPrint(")");
        } else {
            terms[0].processOutput(oc);
            terms[1].processOutput(oc);
        }
    }
}