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

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Here is the source code for lucee.transformer.bytecode.statement.Return.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 java.util.Stack;

import lucee.transformer.bytecode.BytecodeContext;
import lucee.transformer.bytecode.BytecodeException;
import lucee.transformer.bytecode.Position;
import lucee.transformer.bytecode.Statement;
import lucee.transformer.bytecode.expression.Expression;
import lucee.transformer.bytecode.util.ASMConstants;
import lucee.transformer.bytecode.util.Types;
import lucee.transformer.bytecode.visitor.OnFinally;

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

/**
 * Return Statement
 */
public final class Return extends StatementBaseNoFinal {

    Expression expr;

    /**
     * Constructor of the class
     * @param line
     */
    public Return(Position start, Position end) {
        super(start, end);
        setHasFlowController(true);
        //expr=LitString.toExprString("", line);
    }

    /**
     * Constructor of the class
     * @param expr
     * @param line
     */
    public Return(Expression expr, Position start, Position end) {
        super(start, end);
        this.expr = expr;
        setHasFlowController(true);
        //if(expr==null)expr=LitString.toExprString("", line);
    }

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

        if (expr == null)
            ASMConstants.NULL(adapter);
        else
            expr.writeOut(bc, Expression.MODE_REF);

        // call finallies
        Stack<OnFinally> finallies = bc.getOnFinallyStack();
        int len = finallies.size();
        OnFinally onFinally;
        if (len > 0) {
            int rtn = adapter.newLocal(Types.OBJECT);
            adapter.storeLocal(rtn, Types.OBJECT);
            for (int i = len - 1; i >= 0; i--) {
                onFinally = finallies.get(i);
                if (!bc.insideFinally(onFinally))
                    onFinally.writeOut(bc);
            }
            adapter.loadLocal(rtn, Types.OBJECT);
        }

        if (bc.getMethod().getReturnType().equals(Types.VOID)) {
            adapter.pop();
            adapter.visitInsn(Opcodes.RETURN);
        } else
            adapter.visitInsn(Opcodes.ARETURN);
    }

    /**
     *
     * @see lucee.transformer.bytecode.statement.StatementBase#setParent(lucee.transformer.bytecode.Statement)
     */
    public void setParent(Statement parent) {
        super.setParent(parent);
        parent.setHasFlowController(true);
    }
}