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

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Here is the source code for lucee.transformer.bytecode.visitor.ForConditionIntVisitor.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 lucee.transformer.bytecode.util.Types;

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

/**
 * @deprecated replaced with ForIntVisitor
 */
public final class ForConditionIntVisitor implements Opcodes, LoopVisitor {

    private Label l0;
    private Label l1;
    private Label l2;
    private Label l3;
    private int i;
    private Label lend;
    private Label lbegin;

    public int visitBegin(GeneratorAdapter adapter, int start, boolean isLocal) {

        lend = new Label();
        lbegin = new Label();

        i = adapter.newLocal(Types.INT_VALUE);

        l0 = new Label();
        adapter.visitLabel(l0);
        if (isLocal)
            adapter.loadLocal(start, Types.INT_VALUE);
        else
            adapter.push(start);
        //mv.visitInsn(ICONST_1);
        adapter.visitVarInsn(ISTORE, i);
        l1 = new Label();
        adapter.visitLabel(l1);
        l2 = new Label();
        adapter.visitJumpInsn(GOTO, l2);
        l3 = new Label();
        adapter.visitLabel(l3);

        return i;
    }

    public void visitEndBeforeCondition(BytecodeContext bc, int step, boolean isLocal, Position startline) {
        GeneratorAdapter adapter = bc.getAdapter();

        adapter.visitLabel(lbegin);
        if (isLocal) {
            adapter.visitVarInsn(ILOAD, i);
            //adapter.loadLocal(i);
            adapter.loadLocal(step);
            adapter.visitInsn(IADD);
            //adapter.dup();
            adapter.visitVarInsn(ISTORE, i);

        } else
            adapter.visitIincInsn(i, step);
        ExpressionUtil.visitLine(bc, startline);
        adapter.visitLabel(l2);
    }

    public void visitEndAfterCondition(BytecodeContext bc) {
        GeneratorAdapter adapter = bc.getAdapter();

        adapter.ifZCmp(Opcodes.IFNE, l3);

        adapter.visitLabel(lend);

        adapter.visitLocalVariable("i", "I", null, l1, lend, i);

    }

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

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

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

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