lucee.transformer.bytecode.op.OpContional.java Source code

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Here is the source code for lucee.transformer.bytecode.op.OpContional.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.op;

import lucee.transformer.bytecode.BytecodeContext;
import lucee.transformer.bytecode.BytecodeException;
import lucee.transformer.bytecode.cast.CastBoolean;
import lucee.transformer.bytecode.expression.ExprBoolean;
import lucee.transformer.bytecode.expression.Expression;
import lucee.transformer.bytecode.expression.ExpressionBase;
import lucee.transformer.bytecode.util.ExpressionUtil;
import lucee.transformer.bytecode.util.Types;

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

public final class OpContional extends ExpressionBase {

    private ExprBoolean cont;
    private Expression left;
    private Expression right;

    /**
     *
     * @see lucee.transformer.bytecode.expression.ExpressionBase#_writeOut(org.objectweb.asm.commons.GeneratorAdapter, int)
     */
    public Type _writeOut(BytecodeContext bc, int mode) throws BytecodeException {
        GeneratorAdapter adapter = bc.getAdapter();

        Label yes = new Label();
        Label end = new Label();

        // cont
        ExpressionUtil.visitLine(bc, cont.getStart());
        cont.writeOut(bc, MODE_VALUE);
        ExpressionUtil.visitLine(bc, cont.getEnd());
        adapter.visitJumpInsn(Opcodes.IFEQ, yes);

        // left
        ExpressionUtil.visitLine(bc, left.getStart());
        left.writeOut(bc, MODE_REF);
        ExpressionUtil.visitLine(bc, left.getEnd());
        adapter.visitJumpInsn(Opcodes.GOTO, end);

        // right
        ExpressionUtil.visitLine(bc, right.getStart());
        adapter.visitLabel(yes);
        right.writeOut(bc, MODE_REF);
        ExpressionUtil.visitLine(bc, right.getEnd());
        adapter.visitLabel(end);

        return Types.OBJECT;

    }

    private OpContional(Expression cont, Expression left, Expression right) {
        super(left.getStart(), right.getEnd());
        this.cont = CastBoolean.toExprBoolean(cont);
        this.left = left;
        this.right = right;
    }

    public static Expression toExpr(Expression cont, Expression left, Expression right) {
        return new OpContional(cont, left, right);
    }

    /* *
     * @see lucee.transformer.bytecode.expression.Expression#getType()
     * /
    public int getType() {
    return Types._BOOLEAN;
    }*/
}