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

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Here is the source code for lucee.transformer.bytecode.op.OpNegate.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.runtime.exp.TemplateException;
import lucee.transformer.bytecode.BytecodeContext;
import lucee.transformer.bytecode.BytecodeException;
import lucee.transformer.bytecode.Literal;
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.expression.ExpressionBase;
import lucee.transformer.bytecode.literal.LitBoolean;
import lucee.transformer.bytecode.util.Methods;
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 OpNegate extends ExpressionBase implements ExprBoolean {

    private ExprBoolean expr;

    private OpNegate(Expression expr, Position start, Position end) {
        super(start, end);
        this.expr = CastBoolean.toExprBoolean(expr);
    }

    /**
     * Create a String expression from a Expression
     * @param left 
     * @param right 
     * 
     * @return String expression
     * @throws TemplateException 
     */
    public static ExprBoolean toExprBoolean(Expression expr, Position start, Position end) {
        if (expr instanceof Literal) {
            Boolean b = ((Literal) expr).getBoolean(null);
            if (b != null) {
                return new LitBoolean(!b.booleanValue(), start, end);
            }
        }
        return new OpNegate(expr, start, end);
    }

    /**
     *
     * @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();
        if (mode == MODE_REF) {
            _writeOut(bc, MODE_VALUE);
            adapter.invokeStatic(Types.CASTER, Methods.METHOD_TO_BOOLEAN_FROM_BOOLEAN);
            return Types.BOOLEAN;
        }

        Label l1 = new Label();
        Label l2 = new Label();

        expr.writeOut(bc, MODE_VALUE);
        adapter.ifZCmp(Opcodes.IFEQ, l1);

        adapter.visitInsn(Opcodes.ICONST_0);
        adapter.visitJumpInsn(Opcodes.GOTO, l2);
        adapter.visitLabel(l1);
        adapter.visitInsn(Opcodes.ICONST_1);
        adapter.visitLabel(l2);

        return Types.BOOLEAN_VALUE;

    }

    /*public int getType() {
       return Types._BOOLEAN;
    }*/

}