lucee.transformer.bytecode.visitor.WhileVisitor.java Source code

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Here is the source code for lucee.transformer.bytecode.visitor.WhileVisitor.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.visitor;

import lucee.transformer.bytecode.BytecodeContext;
import lucee.transformer.bytecode.Position;
import lucee.transformer.bytecode.util.ExpressionUtil;

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

public final class WhileVisitor implements LoopVisitor {

    private Label begin;
    private Label end;

    public void visitBeforeExpression(BytecodeContext bc) {
        begin = new Label();
        end = new Label();
        bc.getAdapter().visitLabel(begin);
    }

    public void visitAfterExpressionBeforeBody(BytecodeContext bc) {
        bc.getAdapter().ifZCmp(Opcodes.IFEQ, end);
    }

    public void visitAfterBody(BytecodeContext bc, Position endline) {
        bc.getAdapter().visitJumpInsn(Opcodes.GOTO, begin);
        bc.getAdapter().visitLabel(end);
        ExpressionUtil.visitLine(bc, endline);
    }

    /**
     *
     * @see lucee.transformer.bytecode.visitor.LoopVisitor#visitContinue(org.objectweb.asm.commons.GeneratorAdapter)
     */
    public void visitContinue(BytecodeContext bc) {
        bc.getAdapter().visitJumpInsn(Opcodes.GOTO, begin);
    }

    /**
     *
     * @see lucee.transformer.bytecode.visitor.LoopVisitor#visitBreak(org.objectweb.asm.commons.GeneratorAdapter)
     */
    public void visitBreak(BytecodeContext bc) {
        bc.getAdapter().visitJumpInsn(Opcodes.GOTO, end);
    }

    /**
     *
     * @see lucee.transformer.bytecode.visitor.LoopVisitor#getContinueLabel()
     */
    public Label getContinueLabel() {
        return begin;
    }

    /**
     *
     * @see lucee.transformer.bytecode.visitor.LoopVisitor#getBreakLabel()
     */
    public Label getBreakLabel() {
        return end;
    }

}