org.evosuite.instrumentation.LineNumberMethodAdapter.java Source code

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Here is the source code for org.evosuite.instrumentation.LineNumberMethodAdapter.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.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;

/**
 * Instruments classes to call the tracer each time a new line of the source
 * code is passed.
 *
 * @author Gordon Fraser
 */
public class LineNumberMethodAdapter extends MethodVisitor {

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

    private final String fullMethodName;

    private final String methodName;

    private final String className;

    private boolean hadInvokeSpecial = false;

    private List<Integer> skippedLines = new ArrayList<>();

    int currentLine = 0;

    /**
     * <p>Constructor for LineNumberMethodAdapter.</p>
     *
     * @param mv a {@link org.objectweb.asm.MethodVisitor} object.
     * @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 LineNumberMethodAdapter(MethodVisitor mv, String className, String methodName, String desc) {
        super(Opcodes.ASM5, mv);
        fullMethodName = methodName + desc;
        this.className = className;
        this.methodName = methodName;
        if (!methodName.equals("<init>"))
            hadInvokeSpecial = true;
    }

    private void addLineNumberInstrumentation(int line) {
        LinePool.addLine(className, fullMethodName, line);
        this.visitLdcInsn(className);
        this.visitLdcInsn(fullMethodName);
        this.visitLdcInsn(line);
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, PackageInfo.getNameWithSlash(ExecutionTracer.class), "passedLine",
                "(Ljava/lang/String;Ljava/lang/String;I)V", false);
    }

    /** {@inheritDoc} */
    @Override
    public void visitLineNumber(int line, Label start) {
        super.visitLineNumber(line, start);
        currentLine = line;

        if (methodName.equals("<clinit>"))
            return;

        if (!hadInvokeSpecial) {
            skippedLines.add(line);
            return;
        }

        addLineNumberInstrumentation(line);
    }

    /* (non-Javadoc)
     * @see org.objectweb.asm.MethodAdapter#visitMethodInsn(int, java.lang.String, java.lang.String, java.lang.String)
     */
    /** {@inheritDoc} */
    @Override
    public void visitMethodInsn(int opcode, String owner, String name, String desc, boolean itf) {
        super.visitMethodInsn(opcode, owner, name, desc, itf);
        if (opcode == Opcodes.INVOKESPECIAL) {
            if (methodName.equals("<init>")) {
                hadInvokeSpecial = true;
                for (int line : skippedLines) {
                    addLineNumberInstrumentation(line);
                }
                skippedLines.clear();
            }
        }
    }

    /* (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);
    }
}