import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Override
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext,
                MethodDescription instrumentedMethod) {
    switch (returnType) {
        case REFERENCE:
            return new Size(MethodReturn.REFERENCE.apply(methodVisitor, implementationContext).getMaximalSize(),
                            instrumentedMethod.getStackSize());
        case VOID:
            return new Size(MethodReturn.VOID.apply(methodVisitor, implementationContext).getMaximalSize(),
                            instrumentedMethod.getStackSize());
        case INT:
            return new Size(MethodReturn.INTEGER.apply(methodVisitor, implementationContext).getMaximalSize(),
                            instrumentedMethod.getStackSize());
        default:
            throw new IllegalStateException("Illegal opType");
    }

}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Test
public void inPlaceSet() throws Exception {
    DynamicType.Unloaded<SetValueInPlace> val =
                    new ByteBuddy().subclass(SetValueInPlace.class)
                                    .method(ElementMatchers.isDeclaredBy(SetValueInPlace.class))
                                    .intercept(new StackManipulationImplementation(new StackManipulation.Compound(
                                                    MethodVariableAccess.REFERENCE.loadOffset(1),
                                                    MethodVariableAccess.INTEGER.loadOffset(2),
                                                    MethodVariableAccess.INTEGER.loadOffset(3),
                                                    ArrayStackManipulation.store(), MethodReturn.VOID)))
                                    .make();

    val.saveIn(new File("target"));
    SetValueInPlace dv = val.load(getClass().getClassLoader(), ClassLoadingStrategy.Default.WRAPPER).getLoaded()
                    .newInstance();
    int[] ret = {2, 4};
    int[] assertion = {1, 4};
    dv.update(ret, 0, 1);
    assertArrayEquals(assertion, ret);
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Test
public void inPlaceDivide() throws Exception {
    DynamicType.Unloaded<SetValueInPlace> val = new ByteBuddy().subclass(SetValueInPlace.class)
                    .method(ElementMatchers.isDeclaredBy(SetValueInPlace.class))
                    .intercept(new StackManipulationImplementation(new StackManipulation.Compound(
                                    MethodVariableAccess.REFERENCE.loadOffset(1),
                                    MethodVariableAccess.INTEGER.loadOffset(2), Duplication.DOUBLE,
                                    ArrayStackManipulation.load(), MethodVariableAccess.INTEGER.loadOffset(3),
                                    OpStackManipulation.div(), ArrayStackManipulation.store(), MethodReturn.VOID)))
                    .make();

    val.saveIn(new File("target"));
    SetValueInPlace dv = val.load(getClass().getClassLoader(), ClassLoadingStrategy.Default.WRAPPER).getLoaded()
                    .newInstance();
    int[] ret = {2, 4};
    int[] assertion = {1, 4};
    dv.update(ret, 0, 2);
    assertArrayEquals(assertion, ret);
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
/**
 * Applies an implementation that delegates to a invocation handler.
 *
 * @param methodVisitor         The method visitor for writing the byte code to.
 * @param implementationContext The implementation context for the current implementation.
 * @param instrumentedMethod    The method that is instrumented.
 * @param preparingManipulation A stack manipulation that applies any preparation to the operand stack.
 * @param fieldDescription      The field that contains the value for the invocation handler.
 * @return The size of the applied assignment.
 */
protected ByteCodeAppender.Size apply(MethodVisitor methodVisitor,
                                      Context implementationContext,
                                      MethodDescription instrumentedMethod,
                                      StackManipulation preparingManipulation,
                                      FieldDescription fieldDescription) {
    if (instrumentedMethod.isStatic()) {
        throw new IllegalStateException("It is not possible to apply an invocation handler onto the static method " + instrumentedMethod);
    }
    StackManipulation.Size stackSize = new StackManipulation.Compound(
            preparingManipulation,
            FieldAccess.forField(fieldDescription).read(),
            MethodVariableAccess.loadThis(),
            cacheMethods
                    ? MethodConstant.forMethod(instrumentedMethod.asDefined()).cached()
                    : MethodConstant.forMethod(instrumentedMethod.asDefined()),
            ArrayFactory.forType(TypeDescription.Generic.OBJECT).withValues(argumentValuesOf(instrumentedMethod)),
            MethodInvocation.invoke(INVOCATION_HANDLER_TYPE.getDeclaredMethods().getOnly()),
            assigner.assign(TypeDescription.Generic.OBJECT, instrumentedMethod.getReturnType(), Assigner.Typing.DYNAMIC),
            MethodReturn.of(instrumentedMethod.getReturnType())
    ).apply(methodVisitor, implementationContext);
    return new ByteCodeAppender.Size(stackSize.getMaximalSize(), instrumentedMethod.getStackSize());
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Override
public Size apply(MethodVisitor methodVisitor, Context implementationContext, MethodDescription instrumentedMethod) {
    FieldList<?> fieldList = instrumentedType.getDeclaredFields();
    StackManipulation[] fieldLoading = new StackManipulation[fieldList.size()];
    int index = 0;
    for (FieldDescription fieldDescription : fieldList) {
        fieldLoading[index] = new StackManipulation.Compound(
                MethodVariableAccess.loadThis(),
                MethodVariableAccess.load(instrumentedMethod.getParameters().get(index)),
                FieldAccess.forField(fieldDescription).write()
        );
        index++;
    }
    StackManipulation.Size stackSize = new StackManipulation.Compound(
            MethodVariableAccess.loadThis(),
            MethodInvocation.invoke(ConstructorCall.INSTANCE.objectTypeDefaultConstructor),
            new StackManipulation.Compound(fieldLoading),
            MethodReturn.VOID
    ).apply(methodVisitor, implementationContext);
    return new Size(stackSize.getMaximalSize(), instrumentedMethod.getStackSize());
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
/**
 * Blueprint method that for applying the actual implementation.
 *
 * @param methodVisitor           The method visitor to which the implementation is applied to.
 * @param implementationContext   The implementation context for the given implementation.
 * @param instrumentedMethod      The instrumented method that is target of the implementation.
 * @param fixedValueType          A description of the type of the fixed value that is loaded by the
 *                                {@code valueLoadingInstruction}.
 * @param valueLoadingInstruction A stack manipulation that represents the loading of the fixed value onto the
 *                                operand stack.
 * @return A representation of the stack and variable array sized that are required for this implementation.
 */
protected ByteCodeAppender.Size apply(MethodVisitor methodVisitor,
                                      Context implementationContext,
                                      MethodDescription instrumentedMethod,
                                      TypeDescription.Generic fixedValueType,
                                      StackManipulation valueLoadingInstruction) {
    StackManipulation assignment = assigner.assign(fixedValueType, instrumentedMethod.getReturnType(), typing);
    if (!assignment.isValid()) {
        throw new IllegalArgumentException("Cannot return value of type " + fixedValueType + " for " + instrumentedMethod);
    }
    StackManipulation.Size stackSize = new StackManipulation.Compound(
            valueLoadingInstruction,
            assignment,
            MethodReturn.of(instrumentedMethod.getReturnType())
    ).apply(methodVisitor, implementationContext);
    return new ByteCodeAppender.Size(stackSize.getMaximalSize(), instrumentedMethod.getStackSize());
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Override
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext, MethodDescription instrumentedMethod) {
    if (!instrumentedMethod.isMethod()) {
        throw new IllegalArgumentException(instrumentedMethod + " does not describe a field getter or setter");
    }
    FieldDescription fieldDescription = fieldLocation.resolve(instrumentedMethod);
    StackManipulation implementation;
    if (!instrumentedMethod.getReturnType().represents(void.class)) {
        implementation = new StackManipulation.Compound(getter(fieldDescription, instrumentedMethod), MethodReturn.of(instrumentedMethod.getReturnType()));
    } else if (instrumentedMethod.getReturnType().represents(void.class) && instrumentedMethod.getParameters().size() == 1) {
        implementation = new StackManipulation.Compound(setter(fieldDescription, instrumentedMethod.getParameters().get(0)), MethodReturn.VOID);
    } else {
        throw new IllegalArgumentException("Method " + implementationContext + " is no bean property");
    }
    return new Size(implementation.apply(methodVisitor, implementationContext).getMaximalSize(), instrumentedMethod.getStackSize());
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Test
public void testChainingNonVoid() throws Exception {
    NonVoidInterceptor nonVoidInterceptor = new NonVoidInterceptor();

    DynamicType.Loaded<Foo> dynamicType = new ByteBuddy().subclass(Foo.class)
            .method(isDeclaredBy(Foo.class))
            .intercept(MethodDelegation.
                    withDefaultConfiguration()
                    .filter(isDeclaredBy(NonVoidInterceptor.class))
                    .to(nonVoidInterceptor)
                    .andThen(new Implementation.Simple(new TextConstant(FOO), MethodReturn.REFERENCE)))
            .make()
            .load(Foo.class.getClassLoader(), ClassLoadingStrategy.Default.WRAPPER);
    assertThat(dynamicType.getLoaded().getDeclaredConstructor().newInstance().foo(), is(FOO));
    assertThat(nonVoidInterceptor.intercepted, is(true));
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Test
public void testImplementationAppendingMethod() throws Exception {
    DynamicType.Loaded<MethodCallAppending> loaded = new ByteBuddy()
            .subclass(MethodCallAppending.class)
            .method(isDeclaredBy(MethodCallAppending.class))
            .intercept(MethodCall.invokeSuper().andThen(new Implementation.Simple(new TextConstant(FOO), MethodReturn.REFERENCE)))
            .make()
            .load(MethodCallAppending.class.getClassLoader(), ClassLoadingStrategy.Default.WRAPPER);
    assertThat(loaded.getLoadedAuxiliaryTypes().size(), is(0));
    assertThat(loaded.getLoaded().getDeclaredMethods().length, is(1));
    assertThat(loaded.getLoaded().getDeclaredMethod(FOO), not(nullValue(Method.class)));
    assertThat(loaded.getLoaded().getDeclaredConstructors().length, is(1));
    assertThat(loaded.getLoaded().getDeclaredFields().length, is(0));
    MethodCallAppending instance = loaded.getLoaded().getDeclaredConstructor().newInstance();
    assertThat(instance.getClass(), not(CoreMatchers.<Class<?>>is(MethodCallAppending.class)));
    assertThat(instance, instanceOf(MethodCallAppending.class));
    assertThat(instance.foo(), is((Object) FOO));
    instance.assertOnlyCall(FOO);
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Test
public void testImplementationAppendingConstructor() throws Exception {
    DynamicType.Loaded<MethodCallAppending> loaded = new ByteBuddy()
            .subclass(MethodCallAppending.class)
            .method(isDeclaredBy(MethodCallAppending.class))
            .intercept(MethodCall.construct(Object.class.getDeclaredConstructor())
                    .andThen(new Implementation.Simple(new TextConstant(FOO), MethodReturn.REFERENCE)))
            .make()
            .load(MethodCallAppending.class.getClassLoader(), ClassLoadingStrategy.Default.WRAPPER);
    assertThat(loaded.getLoadedAuxiliaryTypes().size(), is(0));
    assertThat(loaded.getLoaded().getDeclaredMethods().length, is(1));
    assertThat(loaded.getLoaded().getDeclaredMethod(FOO), not(nullValue(Method.class)));
    assertThat(loaded.getLoaded().getDeclaredConstructors().length, is(1));
    assertThat(loaded.getLoaded().getDeclaredFields().length, is(0));
    MethodCallAppending instance = loaded.getLoaded().getDeclaredConstructor().newInstance();
    assertThat(instance.getClass(), not(CoreMatchers.<Class<?>>is(MethodCallAppending.class)));
    assertThat(instance, instanceOf(MethodCallAppending.class));
    assertThat(instance.foo(), is((Object) FOO));
    instance.assertZeroCalls();
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Test
@JavaVersionRule.Enforce(8)
public void testDefaultInterfaceSubInterface() throws Exception {
    Class<?> interfaceType = Class.forName(DEFAULT_METHOD_INTERFACE);
    Class<?> dynamicInterfaceType = new ByteBuddy()
            .redefine(interfaceType)
            .method(named(FOO)).intercept(new Implementation.Simple(new TextConstant(BAR), MethodReturn.REFERENCE))
            .make()
            .load(getClass().getClassLoader(), ClassLoadingStrategy.Default.CHILD_FIRST)
            .getLoaded();
    Class<?> dynamicClassType = new ByteBuddy()
            .subclass(dynamicInterfaceType)
            .make()
            .load(dynamicInterfaceType.getClassLoader(), ClassLoadingStrategy.Default.WRAPPER)
            .getLoaded();
    assertThat(dynamicClassType.getMethod(FOO).invoke(dynamicClassType.getDeclaredConstructor().newInstance()), is((Object) BAR));
    assertThat(dynamicInterfaceType.getDeclaredMethods().length, is(1));
    assertThat(dynamicClassType.getDeclaredMethods().length, is(0));
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
public SmtInvokeObjectsHash() {
    super(
        new StackManipulation.Compound(
            MethodInvocation.invoke(new MethodDescription.ForLoadedMethod(OBJECTS_HASH)),
            MethodReturn.INTEGER
        )
    );
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Override
public final Result<StackManipulation> result() {
    return new RSuccess<>(
        new StackManipulation.Compound(
            IntegerConstant.forValue(index),
            MethodReturn.INTEGER
        )
    );
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
public SmtAtomHashCode(TypeDescription type) {
    super(
        new SmtLoadArrayOfFields(type),
        new SmtInvokeAtomHashCode(type),
        new SmtStatic(
            MethodReturn.INTEGER
        )
    );
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Override
protected StackManipulation afterDelegation(MethodDescription instrumentedMethod) {
  if (TypeDescription.VOID.equals(targetMethod.getReturnType().asErasure())) {
    return new StackManipulation.Compound(
        MethodInvocation.invoke(PROCESS_CONTINUATION_STOP_METHOD), MethodReturn.REFERENCE);
  } else {
    return MethodReturn.of(targetMethod.getReturnType().asErasure());
  }
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Override
public ByteCodeAppender appender(final Target implementationTarget) {
  return new ByteCodeAppender() {
    @Override
    public Size apply(
        MethodVisitor methodVisitor,
        Context implementationContext,
        MethodDescription instrumentedMethod) {
      StackManipulation.Size size =
          new StackManipulation.Compound(
                  // Load the this reference
                  MethodVariableAccess.REFERENCE.loadFrom(0),
                  // Load the delegate argument
                  MethodVariableAccess.REFERENCE.loadFrom(1),
                  // Invoke the super constructor (default constructor of Object)
                  MethodInvocation.invoke(
                      new TypeDescription.ForLoadedType(DoFnInvokerBase.class)
                          .getDeclaredMethods()
                          .filter(
                              ElementMatchers.isConstructor()
                                  .and(ElementMatchers.takesArguments(DoFn.class)))
                          .getOnly()),
                  // Return void.
                  MethodReturn.VOID)
              .apply(methodVisitor, implementationContext);
      return new Size(size.getMaximalSize(), instrumentedMethod.getStackSize());
    }
  };
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Override
public ByteCodeAppender appender(final Target implementationTarget) {
  return new ByteCodeAppender() {
    @Override
    public Size apply(
        MethodVisitor methodVisitor,
        Context implementationContext,
        MethodDescription instrumentedMethod) {
      StackManipulation.Size size =
          new StackManipulation.Compound(
                  // Load the this reference
                  MethodVariableAccess.REFERENCE.loadFrom(0),
                  // Invoke the super constructor (default constructor of Object)
                  MethodInvocation.invoke(
                      new TypeDescription.ForLoadedType(Object.class)
                          .getDeclaredMethods()
                          .filter(
                              ElementMatchers.isConstructor()
                                  .and(ElementMatchers.takesArguments(0)))
                          .getOnly()),
                  // Load the this reference
                  MethodVariableAccess.REFERENCE.loadFrom(0),
                  // Load the delegate argument
                  MethodVariableAccess.REFERENCE.loadFrom(1),
                  // Assign the delegate argument to the delegate field
                  FieldAccess.forField(
                          implementationTarget
                              .getInstrumentedType()
                              .getDeclaredFields()
                              .filter(ElementMatchers.named(FN_DELEGATE_FIELD_NAME))
                              .getOnly())
                      .write(),
                  // Return void.
                  MethodReturn.VOID)
              .apply(methodVisitor, implementationContext);
      return new Size(size.getMaximalSize(), instrumentedMethod.getStackSize());
    }
  };
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
private StackManipulation buildStack() throws NoSuchFieldException, NoSuchMethodException {

    if (length == 0) {
      return MethodReturn.VOID;
    }

    final int remainder = (int) (length % COPY_STRIDE);
    final int iterations = (int) ((length - remainder) / COPY_STRIDE);


    // Construct a sequence of stack manipulations
    List<StackManipulation> stack = new ArrayList<>();

    buildSetupStack(stack);

    if (iterations > 0) {
      buildLongCopyStack(stack, iterations);

      if (remainder == 0) {
        // The last increment is not needed
        stack.remove(stack.size() - 1);
      }
    }

    if (remainder > 0) {
      // Do a couple of more byte by byte copies
      buildByteCopyStack(stack, remainder);

      // The last increment is not needed
      stack.remove(stack.size() - 1);
    }

    stack.add(MethodReturn.VOID);

    return toStackManipulation(stack);
  }
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Override
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext,
                MethodDescription instrumentedMethod) {
    //initialize the stack with the array access with this as reference 0 and the array (first argument) as reference 1
    StackManipulation compound = assignOperation();
    StackManipulation.Size size = compound.apply(methodVisitor, implementationContext);
    //resolve the opType to store in the array and retrieve the store command
    StackManipulation store = ArrayAccess.of(typePool.describe("int").resolve()).store();
    size = size.aggregate(store.apply(methodVisitor, implementationContext));
    //set the return opType (ALWAYS REMEMBER TO DO THIS)
    StackManipulation returnOp = MethodReturn.VOID;
    size = size.aggregate(returnOp.apply(methodVisitor, implementationContext));
    return new Size(size.getMaximalSize(), instrumentedMethod.getStackSize());
}
 

import net.bytebuddy.implementation.bytecode.member.MethodReturn; //导入依赖的package包/类
@Override
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext,
                MethodDescription instrumentedMethod) {
    StackManipulation createArray = IntArrayCreation.intCreationOfLength(length);
    StackManipulation.Compound size = new StackManipulation.Compound(createArray, MethodReturn.REFERENCE);

    StackManipulation.Size size1 = size.apply(methodVisitor, implementationContext);
    return new Size(size1.getMaximalSize(), instrumentedMethod.getStackSize());

}