@Test
public void testGenericMethodWithoutGenericExceptionTypes() throws Exception {
DynamicType.Unloaded<?> unloaded =
new ByteBuddy()
.redefine(GenericMethod.class)
.method(named(BAR))
.intercept(FixedValue.nullValue())
.make();
Class<?> type =
unloaded
.load(ClassLoadingStrategy.BOOTSTRAP_LOADER, ClassLoadingStrategy.Default.WRAPPER)
.getLoaded();
MethodDescription createdMethod =
new MethodDescription.ForLoadedMethod(type.getDeclaredMethod(BAR, Object.class));
MethodDescription originalMethod =
new MethodDescription.ForLoadedMethod(
GenericMethod.class.getDeclaredMethod(BAR, Object.class));
assertThat(createdMethod.getTypeVariables(), is(originalMethod.getTypeVariables()));
assertThat(createdMethod.getReturnType(), is(originalMethod.getReturnType()));
assertThat(
createdMethod.getParameters().getOnly().getType(),
is(originalMethod.getParameters().getOnly().getType()));
assertThat(
createdMethod.getExceptionTypes().getOnly(),
is(originalMethod.getExceptionTypes().getOnly()));
}
@Override
public Size apply(
MethodVisitor methodVisitor,
Context implementationContext,
MethodDescription instrumentedMethod) {
StackManipulation thisReference = MethodVariableAccess.REFERENCE.loadOffset(0);
FieldList<?> fieldList = instrumentedType.getDeclaredFields();
StackManipulation[] fieldLoading = new StackManipulation[fieldList.size()];
int index = 0;
for (FieldDescription fieldDescription : fieldList) {
fieldLoading[index] =
new StackManipulation.Compound(
thisReference,
MethodVariableAccess.forType(fieldDescription.getType().asErasure())
.loadOffset(instrumentedMethod.getParameters().get(index).getOffset()),
FieldAccess.forField(fieldDescription).putter());
index++;
}
StackManipulation.Size stackSize =
new StackManipulation.Compound(
thisReference,
MethodInvocation.invoke(ConstructorCall.INSTANCE.objectTypeDefaultConstructor),
new StackManipulation.Compound(fieldLoading),
MethodReturn.VOID)
.apply(methodVisitor, implementationContext);
return new Size(stackSize.getMaximalSize(), instrumentedMethod.getStackSize());
}
/**
* Creates a method handle representation of the given method.
*
* @param methodDescription The method ro represent.
* @return A method handle representing the given method.
*/
public static MethodHandle of(MethodDescription methodDescription) {
return new MethodHandle(
HandleType.of(methodDescription),
methodDescription.getDeclaringType().asRawType(),
methodDescription.getInternalName(),
methodDescription.getReturnType().asRawType(),
methodDescription.getParameters().asTypeList().asRawTypes());
}
@Override
public AnnotationAppender.Target make(
MethodVisitor methodVisitor, MethodDescription methodDescription) {
if (parameterIndex >= methodDescription.getParameters().size()) {
throw new IllegalArgumentException(
"Method " + methodDescription + " has less then " + parameterIndex + " parameters");
}
return new AnnotationAppender.Target.OnMethodParameter(methodVisitor, parameterIndex);
}
/**
* Creates a method attribute appender factory that writes all annotations of a given method,
* both the method annotations themselves and all annotations that are defined for every
* parameter.
*
* @param methodDescription The method from which to extract the annotations.
* @return A method attribute appender factory for an appender that writes all annotations of
* the supplied method.
*/
public static Factory of(MethodDescription methodDescription) {
ParameterList<?> parameters = methodDescription.getParameters();
List<MethodAttributeAppender.Factory> methodAttributeAppenders =
new ArrayList<MethodAttributeAppender.Factory>(parameters.size() + 1);
methodAttributeAppenders.add(new Explicit(methodDescription.getDeclaredAnnotations()));
for (ParameterDescription parameter : parameters) {
methodAttributeAppenders.add(
new Explicit(parameter.getIndex(), parameter.getDeclaredAnnotations()));
}
return new Factory.Compound(methodAttributeAppenders);
}
/**
* Creates a method handle representation of the given method for an explicit special method
* invocation of an otherwise virtual method.
*
* @param methodDescription The method ro represent.
* @param typeDescription The type on which the method is to be invoked on as a special method
* invocation.
* @return A method handle representing the given method as special method invocation.
*/
public static MethodHandle ofSpecial(
MethodDescription methodDescription, TypeDescription typeDescription) {
if (!methodDescription.isSpecializableFor(typeDescription)) {
throw new IllegalArgumentException(
"Cannot specialize " + methodDescription + " for " + typeDescription);
}
return new MethodHandle(
HandleType.ofSpecial(methodDescription),
typeDescription,
methodDescription.getInternalName(),
methodDescription.getReturnType().asRawType(),
methodDescription.getParameters().asTypeList().asRawTypes());
}
@Override
@Before
public void setUp() throws Exception {
when(parameterList.asTypeList()).thenReturn(parameterTypes);
when(instrumentedType.getSupertype()).thenReturn(superType);
when(superType.getDeclaredMethods())
.thenReturn(new MethodList.Explicit(Collections.singletonList(superMethodConstructor)));
when(superType.getInternalName()).thenReturn(BAR);
when(superMethod.getDeclaringType()).thenReturn(superType);
when(superType.getStackSize()).thenReturn(StackSize.ZERO);
when(superMethod.getReturnType()).thenReturn(returnType);
when(superMethod.getInternalName()).thenReturn(BAZ);
when(superMethod.getDescriptor()).thenReturn(FOOBAR);
when(superMethod.getParameters()).thenReturn(parameterList);
when(superMethodConstructor.isConstructor()).thenReturn(true);
when(superMethodConstructor.getParameters()).thenReturn(parameterList);
when(superMethodConstructor.getReturnType()).thenReturn(returnType);
when(superMethodConstructor.isSpecializableFor(superType)).thenReturn(true);
when(superMethodConstructor.getInternalName()).thenReturn(QUXBAZ);
when(superMethodConstructor.getDescriptor()).thenReturn(BAZBAR);
super.setUp();
}
@Before
public void setUp() throws Exception {
when(methodDescription.getDeclaringType()).thenReturn(typeDescription);
when(methodDescription.getReturnType()).thenReturn(returnType);
when(methodDescription.getInternalName()).thenReturn(FOO);
when(methodDescription.getDescriptor()).thenReturn(BAZ);
when(typeDescription.getInternalName()).thenReturn(BAR);
when(typeDescription.getDescriptor()).thenReturn(BAR);
when(methodNameTransformer.transform(methodDescription)).thenReturn(QUX);
when(otherMethodNameTransformer.transform(methodDescription)).thenReturn(FOO + BAR);
when(parameterType.getStackSize()).thenReturn(StackSize.ZERO);
ParameterList parameterList =
ParameterList.Explicit.latent(methodDescription, Collections.singletonList(parameterType));
when(methodDescription.getParameters()).thenReturn(parameterList);
}
/**
* Creates a linked hash map of field names to their types where each field represents a parameter
* of the method.
*
* @param methodDescription The method to extract into fields.
* @return A map of fields in the order they need to be loaded onto the operand stack for invoking
* the original method, including a reference to the instance of the instrumented type that is
* invoked if applicable.
*/
private static LinkedHashMap<String, TypeDescription> extractFields(
MethodDescription methodDescription) {
ParameterList<?> parameters = methodDescription.getParameters();
LinkedHashMap<String, TypeDescription> typeDescriptions =
new LinkedHashMap<String, TypeDescription>(
(methodDescription.isStatic() ? 0 : 1) + parameters.size());
int currentIndex = 0;
if (!methodDescription.isStatic()) {
typeDescriptions.put(
fieldName(currentIndex++), methodDescription.getDeclaringType().asErasure());
}
for (ParameterDescription parameterDescription : parameters) {
typeDescriptions.put(fieldName(currentIndex++), parameterDescription.getType().asErasure());
}
return typeDescriptions;
}
@Override
public void apply(
MethodVisitor methodVisitor,
MethodDescription methodDescription,
AnnotationValueFilter annotationValueFilter) {
AnnotationAppender annotationAppender =
new AnnotationAppender.Default(new AnnotationAppender.Target.OnMethod(methodVisitor));
annotationAppender =
methodDescription
.getReturnType()
.accept(
AnnotationAppender.ForTypeAnnotations.ofMethodReturnType(
annotationAppender, annotationValueFilter));
annotationAppender =
AnnotationAppender.ForTypeAnnotations.ofTypeVariable(
annotationAppender,
annotationValueFilter,
AnnotationAppender.ForTypeAnnotations.VARIABLE_ON_INVOKEABLE,
methodDescription.getTypeVariables());
for (AnnotationDescription annotation : methodDescription.getDeclaredAnnotations()) {
annotationAppender = annotationAppender.append(annotation, annotationValueFilter);
}
for (ParameterDescription parameterDescription : methodDescription.getParameters()) {
AnnotationAppender parameterAppender =
new AnnotationAppender.Default(
new AnnotationAppender.Target.OnMethodParameter(
methodVisitor, parameterDescription.getIndex()));
parameterAppender =
parameterDescription
.getType()
.accept(
AnnotationAppender.ForTypeAnnotations.ofMethodParameterType(
parameterAppender, annotationValueFilter, parameterDescription.getIndex()));
for (AnnotationDescription annotation : parameterDescription.getDeclaredAnnotations()) {
parameterAppender = parameterAppender.append(annotation, annotationValueFilter);
}
}
int exceptionTypeIndex = 0;
for (TypeDescription.Generic exceptionType : methodDescription.getExceptionTypes()) {
annotationAppender =
exceptionType.accept(
AnnotationAppender.ForTypeAnnotations.ofExceptionType(
annotationAppender, annotationValueFilter, exceptionTypeIndex++));
}
}
private void checkMethodSignature(MethodDescription instrumentedMethod) {
final String errMessage = "%s must have signature `void copy(java.lang.Object, long)`";
Preconditions.checkArgument(
instrumentedMethod.getReturnType().represents(void.class), errMessage, instrumentedMethod);
ParameterList parameters = instrumentedMethod.getParameters();
Preconditions.checkArgument(parameters.size() == 2, errMessage, instrumentedMethod);
Preconditions.checkArgument(
parameters.get(0).getTypeDescription().represents(Object.class),
errMessage,
instrumentedMethod);
Preconditions.checkArgument(
parameters.get(1).getTypeDescription().represents(long.class),
errMessage,
instrumentedMethod);
}
/**
* Returns a method type description of the given method.
*
* @param methodDescription The method to extract the method type from.
* @return The method type of the given method.
*/
public static MethodType of(MethodDescription methodDescription) {
return new MethodType(
methodDescription.getReturnType().asRawType(),
methodDescription.getParameters().asTypeList().asRawTypes());
}