BreakStatement.java

/*
 * @(#) $(JCGO)/jtrsrc/com/ivmaisoft/jcgo/BreakStatement.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 the break statement.
 ** 
 * Format: BREAK [ID] SEMI
 */

class BreakStatement extends LexNode {

    private boolean analysisDone;

    BreakableStmt labelStmt;

    private TryStatement curTry;

    private TryStatement lastBreakableTry;

    BreakStatement(Term b) {
        super(b);
    }

    void processPass1(Context c) {
        if (!processPassOneCommon(c)) {
            if (labelStmt != null) {
                labelStmt.makeBreakLabel(c.currentMethod);
                c.hasBreakDeep = true;
            } else {
                c.hasBreakSimple = true;
            }
        }
    }

    final boolean processPassOneCommon(Context c) {
        if (analysisDone)
            return true;
        analysisDone = true;
        curTry = c.currentTry;
        if (terms[0].notEmpty()) {
            if (c.currentLabelStmt != null) {
                labelStmt = c.currentLabelStmt.find(terms[0].dottedName());
            }
            if (labelStmt == null) {
                fatalError(c, "Undefined label: " + terms[0].dottedName());
            }
        } else {
            lastBreakableTry = c.lastBreakableTry;
            if (c.currentLabelStmt != null) {
                if (c.breakableHidden) {
                    labelStmt = c.currentLabelStmt;
                }
            } else {
                fatalError(c, "No breakable statement found");
            }
        }
        return false;
    }

    final TryStatement curTry() {
        assertCond(analysisDone);
        return curTry;
    }

    final TryStatement lastBreakableTry() {
        return lastBreakableTry;
    }

    final boolean isReturnAtEnd(boolean allowBreakThrow) {
        return allowBreakThrow;
    }

    void processOutput(OutputContext oc) {
        assertCond(analysisDone);
        if (labelStmt != null) {
            labelStmt.writeGoto(oc, curTry, true);
        } else if (!terms[0].notEmpty()) {
            TryStatement.outputFinallyGroup(curTry, lastBreakableTry, oc,
                    "break");
        }
    }
}