Examples with ComparisonTransformation org.evosuite.instrumentation.testability.ComparisonTransformation used on opensource projects

Example 1 with ComparisonTransformation

use of org.evosuite.instrumentation.testability.ComparisonTransformation in project evosuite by EvoSuite.

the class BytecodeInstrumentation method transformBytes.

/**
 * <p>
 * transformBytes
 * </p>
 *
 * @param className
 *            a {@link java.lang.String} object.
 * @param reader
 *            a {@link org.objectweb.asm.ClassReader} object.
 * @return an array of byte.
 */
public byte[] transformBytes(ClassLoader classLoader, String className, ClassReader reader) {
    int readFlags = ClassReader.SKIP_FRAMES;
    if (Properties.INSTRUMENTATION_SKIP_DEBUG)
        readFlags |= ClassReader.SKIP_DEBUG;
    String classNameWithDots = ResourceList.getClassNameFromResourcePath(className);
    if (!checkIfCanInstrument(classNameWithDots)) {
        throw new RuntimeException("Should not transform a shared class (" + classNameWithDots + ")! Load by parent (JVM) classloader.");
    }
    TransformationStatistics.reset();
    /*
		 * To use COMPUTE_FRAMES we need to remove JSR commands. Therefore, we
		 * have a JSRInlinerAdapter in NonTargetClassAdapter as well as
		 * CFGAdapter.
		 */
    int asmFlags = ClassWriter.COMPUTE_FRAMES;
    ClassWriter writer = new ComputeClassWriter(asmFlags);
    ClassVisitor cv = writer;
    if (logger.isDebugEnabled()) {
        cv = new TraceClassVisitor(cv, new PrintWriter(System.err));
    }
    if (Properties.RESET_STATIC_FIELDS) {
        cv = new StaticAccessClassAdapter(cv, className);
    }
    if (Properties.PURE_INSPECTORS) {
        CheapPurityAnalyzer purityAnalyzer = CheapPurityAnalyzer.getInstance();
        cv = new PurityAnalysisClassVisitor(cv, className, purityAnalyzer);
    }
    if (Properties.MAX_LOOP_ITERATIONS >= 0) {
        cv = new LoopCounterClassAdapter(cv);
    }
    // Apply transformations to class under test and its owned classes
    if (DependencyAnalysis.shouldAnalyze(classNameWithDots)) {
        logger.debug("Applying target transformation to class " + classNameWithDots);
        if (!Properties.TEST_CARVING && Properties.MAKE_ACCESSIBLE) {
            cv = new AccessibleClassAdapter(cv, className);
        }
        cv = new RemoveFinalClassAdapter(cv);
        cv = new ExecutionPathClassAdapter(cv, className);
        cv = new CFGClassAdapter(classLoader, cv, className);
        if (Properties.EXCEPTION_BRANCHES) {
            cv = new ExceptionTransformationClassAdapter(cv, className);
        }
        if (Properties.ERROR_BRANCHES) {
            cv = new ErrorConditionClassAdapter(cv, className);
        }
    } else {
        logger.debug("Not applying target transformation");
        cv = new NonTargetClassAdapter(cv, className);
        if (Properties.MAKE_ACCESSIBLE) {
            cv = new AccessibleClassAdapter(cv, className);
        }
        // to create the CFG first
        if (Properties.TT && classNameWithDots.startsWith(Properties.CLASS_PREFIX)) {
            cv = new CFGClassAdapter(classLoader, cv, className);
        }
    }
    // Collect constant values for the value pool
    cv = new PrimitiveClassAdapter(cv, className);
    if (Properties.RESET_STATIC_FIELDS) {
        cv = handleStaticReset(className, cv);
    }
    // Mock instrumentation (eg File and TCP).
    if (TestSuiteWriterUtils.needToUseAgent()) {
        cv = new MethodCallReplacementClassAdapter(cv, className);
        /*
			 * If the class is serializable, then doing any change (adding hashCode, static reset, etc)
			 * will change the serialVersionUID if it is not defined in the class.
			 * Hence, if it is not defined, we have to define it to
			 * avoid problems in serialising the class, as reading Master will not do instrumentation.
			 * The serialVersionUID HAS to be the same as the un-instrumented class
			 */
        if (RuntimeSettings.applyUIDTransformation)
            cv = new SerialVersionUIDAdder(cv);
    }
    // Testability Transformations
    if (classNameWithDots.startsWith(Properties.PROJECT_PREFIX) || (!Properties.TARGET_CLASS_PREFIX.isEmpty() && classNameWithDots.startsWith(Properties.TARGET_CLASS_PREFIX)) || shouldTransform(classNameWithDots)) {
        ClassNode cn = new AnnotatedClassNode();
        reader.accept(cn, readFlags);
        logger.info("Starting transformation of " + className);
        if (Properties.STRING_REPLACEMENT) {
            StringTransformation st = new StringTransformation(cn);
            if (isTargetClassName(classNameWithDots) || shouldTransform(classNameWithDots))
                cn = st.transform();
        }
        ComparisonTransformation cmp = new ComparisonTransformation(cn);
        if (isTargetClassName(classNameWithDots) || shouldTransform(classNameWithDots)) {
            cn = cmp.transform();
            ContainerTransformation ct = new ContainerTransformation(cn);
            cn = ct.transform();
        }
        if (shouldTransform(classNameWithDots)) {
            logger.info("Testability Transforming " + className);
            BooleanTestabilityTransformation tt = new BooleanTestabilityTransformation(cn, classLoader);
            try {
                cn = tt.transform();
            } catch (Throwable t) {
                throw new Error(t);
            }
            logger.info("Testability Transformation done: " + className);
        }
        // -----
        cn.accept(cv);
        if (Properties.TEST_CARVING && TransformerUtil.isClassConsideredForInstrumentation(className)) {
            return handleCarving(className, writer);
        }
    } else {
        reader.accept(cv, readFlags);
    }
    return writer.toByteArray();
}