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

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Here is the source code for org.apache.drill.exec.compile.bytecode.ValueHolderReplacementVisitor.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 java.io.PrintWriter;

import org.apache.commons.io.output.StringBuilderWriter;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.util.Textifier;
import org.objectweb.asm.util.TraceMethodVisitor;

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

    public ValueHolderReplacementVisitor(ClassVisitor cw) {
        super(Opcodes.ASM4, cw);
    }

    @Override
    public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
        MethodVisitor innerVisitor = super.visitMethod(access, name, desc, signature, exceptions);
        //     innerVisitor = new Debugger(access, name, desc, signature, exceptions, innerVisitor);
        return new ScalarReplacementNode(access, name, desc, signature, exceptions, innerVisitor);
    }

    private static class Debugger extends MethodNode {

        MethodVisitor inner;

        public Debugger(int access, String name, String desc, String signature, String[] exceptions,
                MethodVisitor inner) {
            super(access, name, desc, signature, exceptions);
            this.inner = inner;

        }

        @Override
        public void visitEnd() {
            try {
                accept(inner);
            } catch (Exception e) {
                Textifier t = new Textifier();
                accept(new TraceMethodVisitor(t));
                StringBuilderWriter sw = new StringBuilderWriter();
                PrintWriter pw = new PrintWriter(sw);
                t.print(pw);
                pw.flush();
                String bytecode = sw.getBuilder().toString();
                logger.error(String.format("Failure while rendering method %s, %s, %s.  ByteCode:\n %s", name, desc,
                        signature, bytecode), e);
                throw new RuntimeException(
                        String.format("Failure while rendering method %s, %s, %s.  ByteCode:\n %s", name, desc,
                                signature, bytecode),
                        e);
            }

        }

    }
}