eu.activelogic.instrumentor.thread.vm.ThreadConstructorAdviceCreator.java Source code

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Here is the source code for eu.activelogic.instrumentor.thread.vm.ThreadConstructorAdviceCreator.java

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/*
 *    Copyright 2015 Aleksandr Panzin (alex@activelogic.eu)
 *
 *  Licensed 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 eu.activelogic.instrumentor.thread.vm;

import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.AdviceAdapter;

public class ThreadConstructorAdviceCreator extends AdviceAdapter {

    private static final String CREATE_THREAD_METHOD_SIG = "(Ljava/lang/Thread;Ljava/lang/Runnable;)V";
    private static final String CREATE_THREAD_METHOD = "createThread";
    private final int runnableIndex;

    public ThreadConstructorAdviceCreator(MethodVisitor mv, int access, String name, String desc,
            int runnableIndex) {
        super(Opcodes.ASM5, mv, access, name, desc);
        this.runnableIndex = runnableIndex;
    }

    @Override
    protected void onMethodEnter() {

    }

    @Override
    protected void onMethodExit(int opCode) {
        if (opCode == Opcodes.ATHROW)
            return;
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        if (runnableIndex < 0)
            mv.visitInsn(Opcodes.ACONST_NULL);
        else
            mv.visitVarInsn(Opcodes.ALOAD, runnableIndex);

        mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(ThreadInterceptor.class),
                CREATE_THREAD_METHOD, CREATE_THREAD_METHOD_SIG, false);
    }

    public int getRunnableIndex() {
        return runnableIndex;
    }

}