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

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Here is the source code for org.apache.drill.exec.compile.bytecode.ReplaceMethodInvoke.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.File;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.URL;

import org.apache.drill.common.config.DrillConfig;
import org.apache.drill.exec.compile.DrillCheckClassAdapter;
import org.apache.drill.exec.compile.QueryClassLoader;
import org.apache.drill.exec.server.options.SystemOptionManager;
import org.apache.drill.exec.store.sys.local.LocalPStoreProvider;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.util.Textifier;
import org.objectweb.asm.util.TraceClassVisitor;

import com.google.common.io.Files;
import com.google.common.io.Resources;

public class ReplaceMethodInvoke {
    // private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ReplaceMethodInvoke.class);

    public static void main(String[] args) throws Exception {
        final String k2 = "org/apache/drill/Pickle.class";
        final URL url = Resources.getResource(k2);
        final byte[] clazz = Resources.toByteArray(url);
        final ClassReader cr = new ClassReader(clazz);

        final ClassWriter cw = writer();
        final TraceClassVisitor visitor = new TraceClassVisitor(cw, new Textifier(), new PrintWriter(System.out));
        final ValueHolderReplacementVisitor v2 = new ValueHolderReplacementVisitor(visitor, true);
        cr.accept(v2, ClassReader.EXPAND_FRAMES);//| ClassReader.SKIP_DEBUG);

        final byte[] output = cw.toByteArray();
        Files.write(output, new File("/src/scratch/bytes/S.class"));
        check(output);

        final DrillConfig c = DrillConfig.forClient();
        final SystemOptionManager m = new SystemOptionManager(c, new LocalPStoreProvider(c));
        m.init();
        try (QueryClassLoader ql = new QueryClassLoader(DrillConfig.create(), m)) {
            ql.injectByteCode("org.apache.drill.Pickle$OutgoingBatch", output);
            Class<?> clz = ql.loadClass("org.apache.drill.Pickle$OutgoingBatch");
            clz.getMethod("x").invoke(null);
        }
    }

    private static final void check(final byte[] b) {
        final ClassReader cr = new ClassReader(b);
        final ClassWriter cw = writer();
        final ClassVisitor cv = new DrillCheckClassAdapter(cw);
        cr.accept(cv, 0);

        final StringWriter sw = new StringWriter();
        final PrintWriter pw = new PrintWriter(sw);
        DrillCheckClassAdapter.verify(new ClassReader(cw.toByteArray()), false, pw);

        final String checkString = sw.toString();
        if (!checkString.isEmpty()) {
            throw new IllegalStateException(checkString);
        }
    }

    private static ClassWriter writer() {
        final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
        return cw;
    }
}