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

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Here is the source code for lucee.transformer.bytecode.visitor.DoWhileVisitor.java

Source

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

// TODO testen wurde noch nicht getestet

public final class DoWhileVisitor implements LoopVisitor {

    private Label begin;
    private Label end;
    private Label beforeEnd;

    public void visitBeginBody(GeneratorAdapter mv) {
        end = new Label();
        beforeEnd = new Label();

        begin = new Label();
        mv.visitLabel(begin);
    }

    public void visitEndBodyBeginExpr(GeneratorAdapter mv) {
        mv.visitLabel(beforeEnd);
    }

    public void visitEndExpr(GeneratorAdapter mv) {
        mv.ifZCmp(Opcodes.IFNE, begin);
        mv.visitLabel(end);
    }

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

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

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

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

}