org.apache.drill.exec.compile.bytecode.TrackingInstructionList.java Source code

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Here is the source code for org.apache.drill.exec.compile.bytecode.TrackingInstructionList.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.drill.exec.compile.bytecode;

import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.analysis.Frame;

public class TrackingInstructionList extends InsnList {
    static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(TrackingInstructionList.class);

    Frame<?> currentFrame;
    Frame<?> nextFrame;
    Frame<?>[] frames;
    InsnList inner;
    int index = 0;

    public TrackingInstructionList(Frame<?>[] frames, InsnList inner) {
        super();

        this.frames = frames;
        this.inner = inner;
    }

    public InsnList getInner() {
        return inner;
    }

    @Override
    public void accept(MethodVisitor mv) {
        AbstractInsnNode insn = inner.getFirst();
        while (insn != null) {
            currentFrame = frames[index];
            nextFrame = index + 1 < frames.length ? frames[index + 1] : null;
            insn.accept(mv);

            insn = insn.getNext();
            index++;
        }
    }

    @Override
    public int size() {
        return inner.size();
    }

}