lucee.transformer.bytecode.statement.While.java Source code

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Here is the source code for lucee.transformer.bytecode.statement.While.java

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/**
 *
 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 **/
package lucee.transformer.bytecode.statement;

import lucee.transformer.bytecode.Body;
import lucee.transformer.bytecode.BytecodeContext;
import lucee.transformer.bytecode.BytecodeException;
import lucee.transformer.bytecode.Position;
import lucee.transformer.bytecode.cast.CastBoolean;
import lucee.transformer.bytecode.expression.ExprBoolean;
import lucee.transformer.bytecode.expression.Expression;
import lucee.transformer.bytecode.literal.LitBoolean;

import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.commons.GeneratorAdapter;

public final class While extends StatementBaseNoFinal implements FlowControlBreak, FlowControlContinue, HasBody {

    private ExprBoolean expr;
    private Body body;

    private Label begin = new Label();
    private Label end = new Label();
    private String label;

    /**
     * Constructor of the class
     * @param expr
     * @param body
     * @param line
     */
    public While(Expression expr, Body body, Position start, Position end, String label) {
        super(start, end);
        this.expr = CastBoolean.toExprBoolean(expr);
        this.body = body;
        body.setParent(this);
        this.label = label;
    }

    /**
     * Constructor of the class
     * @param b
     * @param body
     * @param line
     */
    public While(boolean b, Body body, Position start, Position end, String label) {
        this(LitBoolean.toExprBoolean(b), body, start, end, label);
    }

    @Override
    public void _writeOut(BytecodeContext bc) throws BytecodeException {
        GeneratorAdapter adapter = bc.getAdapter();
        adapter.visitLabel(begin);

        expr.writeOut(bc, Expression.MODE_VALUE);
        adapter.ifZCmp(Opcodes.IFEQ, end);

        body.writeOut(bc);
        adapter.visitJumpInsn(Opcodes.GOTO, begin);

        adapter.visitLabel(end);
    }

    @Override
    public Label getBreakLabel() {
        return end;
    }

    @Override
    public Label getContinueLabel() {
        return begin;
    }

    @Override
    public Body getBody() {
        return body;
    }

    @Override
    public String getLabel() {
        return label;
    }
}