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How to use ComputeClassWriter class of org.evomaster.client.java.instrumentation package

Best EvoMaster code snippet using org.evomaster.client.java.instrumentation.ComputeClassWriter

Source:Instrumentator.java

...40        if (!ClassesToExclude.checkIfCanInstrument(className)) {41            throw new IllegalArgumentException("Cannot instrument " + className);42        }43        int asmFlags = ClassWriter.COMPUTE_FRAMES;44        ClassWriter writer = new ComputeClassWriter(asmFlags);45        ClassVisitor cv = writer;46        //avoid reading frames, as we re-compute them47        int readFlags = ClassReader.SKIP_FRAMES;48        ClassNode cn = new ClassNode();49        reader.accept(cn, readFlags);50        if(canInstrumentForCoverage(className)){51            cv = new CoverageClassVisitor(cv, className);52        } else {53            cv = new ThirdPartyClassVisitor(cv, className);54        }55        cn.accept(cv);56        return writer.toByteArray();57    }58    private boolean canInstrumentForCoverage(ClassName className){...

ComputeClassWriter

Using AI Code Generation

1package org.evomaster.client.java.instrumentation.example;2import org.evomaster.client.java.instrumentation.AdditionalInfo;3import org.evomaster.client.java.instrumentation.ComputeClassWriter;4import java.io.FileOutputStream;5import java.io.IOException;6import java.io.OutputStream;7import java.lang.instrument.ClassFileTransformer;8import java.lang.instrument.IllegalClassFormatException;9import java.security.ProtectionDomain;10import java.util.ArrayList;11import java.util.List;12public class ExampleTransformer implements ClassFileTransformer {13    private final List<String> classesToInstrument = new ArrayList<>();14    public ExampleTransformer() {15        classesToInstrument.add("org/evomaster/client/java/instrumentation/example/Example");16        classesToInstrument.add("org/evomaster/client/java/instrumentation/example/Example2");17    }18    public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,19                            ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {20        if (className == null) {21            return null;22        }23        if (!classesToInstrument.contains(className)) {24            return null;25        }26        ComputeClassWriter cw = new ComputeClassWriter(0, null, null, true, true);27        try {28            AdditionalInfo info = new AdditionalInfo(className, loader);29            ExampleClassVisitor cv = new ExampleClassVisitor(cw, info);30            ClassReader cr = new ClassReader(classfileBuffer);31            cr.accept(cv, 0);32        } catch (Throwable t) {33            t.printStackTrace();34            throw t;35        }36        byte[] byteCode = cw.toByteArray();37        try (OutputStream os = new FileOutputStream(className + ".class")) {38            os.write(byteCode);39        } catch (IOException e) {40            e.printStackTrace();41        }42        return byteCode;43    }44}45public ClassWriter(int flags) {46    this(flags, null, null);47}48public ComputeClassWriter(int flags, ClassVisitor classVisitor, AdditionalInfo additionalInfo, boolean computeFrames, boolean computeMaxs) {49    super(flags);50    this.classVisitor = classVisitor;

ComputeClassWriter

Using AI Code Generation

1public class ComputeClassWriterTest {2    public static void main(String[] args) {3        String className = "com.foo.bar.TestMe";4        String methodName = "foo";5        String methodDesc = "(Ljava/lang/String;)I";6        String methodBody = "return 0;";7        String targetDir = "/tmp";8        String targetClass = "TestMe";9        ComputeClassWriter.computeClass(className, methodName, methodDesc, methodBody, targetDir, targetClass);10    }11}12package com.foo.bar;13import org.junit.jupiter.api.Test;14class TestMe {15    void test_0() {

ComputeClassWriter

Using AI Code Generation

1import org.evomaster.client.java.instrumentation.ComputeClassWriter;2class ComputeClassWriterExample {3    public static void main(String[] args) {4        String targetClass = "org.example.TargetClass";5        String targetMethod = "targetMethod";6        String targetMethodDescriptor = "(Ljava/lang/String;)I";7        String targetMethodReturnType = "I";8        String targetMethodParameters = "Ljava/lang/String;";9        String className = ComputeClassWriter.computeClassName(targetClass, targetMethod, targetMethodDescriptor);10        byte[] classBytes = ComputeClassWriter.computeClassBytes(targetClass, targetMethod, targetMethodDescriptor, targetMethodReturnType, targetMethodParameters);11        System.out.println("Class name: " + className);12        System.out.println("Class bytes: " + classBytes);13    }14}

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