org.evosuite.instrumentation.MethodEntryAdapter.java Source code

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Here is the source code for org.evosuite.instrumentation.MethodEntryAdapter.java

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/**
 * Copyright (C) 2010-2016 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite 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 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite 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 Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see <http://www.gnu.org/licenses/>.
 */
package org.evosuite.instrumentation;

import org.evosuite.PackageInfo;
import org.evosuite.testcase.execution.ExecutionTrace;
import org.evosuite.testcase.execution.ExecutionTracer;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.commons.AdviceAdapter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Instrument classes to keep track of method entry and exit
 *
 * @author Gordon Fraser
 */
public class MethodEntryAdapter extends AdviceAdapter {

    @SuppressWarnings("unused")
    private static Logger logger = LoggerFactory.getLogger(MethodEntryAdapter.class);

    String className;
    String methodName;
    String fullMethodName;
    int access;

    /**
     * <p>Constructor for MethodEntryAdapter.</p>
     *
     * @param mv a {@link org.objectweb.asm.MethodVisitor} object.
     * @param access a int.
     * @param className a {@link java.lang.String} object.
     * @param methodName a {@link java.lang.String} object.
     * @param desc a {@link java.lang.String} object.
     */
    public MethodEntryAdapter(MethodVisitor mv, int access, String className, String methodName, String desc) {
        super(Opcodes.ASM5, mv, access, methodName, desc);
        this.className = className;
        this.methodName = methodName;
        this.fullMethodName = methodName + desc;
        this.access = access;
    }

    /** {@inheritDoc} */
    @Override
    public void onMethodEnter() {

        if (methodName.equals("<clinit>"))
            return; // FIXXME: Should we call super.onMethodEnter() here?

        mv.visitLdcInsn(className);
        mv.visitLdcInsn(fullMethodName);
        if ((access & Opcodes.ACC_STATIC) > 0) {
            mv.visitInsn(Opcodes.ACONST_NULL);
        } else {
            mv.visitVarInsn(Opcodes.ALOAD, 0);
        }
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, PackageInfo.getNameWithSlash(ExecutionTracer.class),
                "enteredMethod", "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/Object;)V", false);

        super.onMethodEnter();
    }

    /** {@inheritDoc} */
    @Override
    public void onMethodExit(int opcode) {
        // TODO: Check for <clinit>

        if (opcode != Opcodes.ATHROW) {

            mv.visitLdcInsn(className);
            mv.visitLdcInsn(fullMethodName);
            mv.visitMethodInsn(Opcodes.INVOKESTATIC,
                    PackageInfo.getNameWithSlash(org.evosuite.testcase.execution.ExecutionTracer.class),
                    "leftMethod", "(Ljava/lang/String;Ljava/lang/String;)V", false);
        }
        super.onMethodExit(opcode);
    }

    /* (non-Javadoc)
     * @see org.objectweb.asm.commons.LocalVariablesSorter#visitMaxs(int, int)
     */
    /** {@inheritDoc} */
    @Override
    public void visitMaxs(int maxStack, int maxLocals) {
        int maxNum = 3;
        super.visitMaxs(Math.max(maxNum, maxStack), maxLocals);
    }
}