Enum Duplication

    • Enum Constant Detail

      • ZERO

        public static final Duplication ZERO
        A duplication of no values. This corresponds a no-op instruction.
      • SINGLE

        public static final Duplication SINGLE
        A duplication of a single-sized stack values.
      • DOUBLE

        public static final Duplication DOUBLE
        A duplication of a double-sized stack value.
    • Field Detail

      • size

        protected final StackManipulation.Size size
        The size representing the impact of applying the duplication onto the operand stack.
      • opcode

        private final int opcode
        The opcode that represents the manipulation.
    • Constructor Detail

      • Duplication

        private Duplication​(StackSize stackSize,
                            int opcode)
        Creates a new duplication.
        Parameters:
        stackSize - The size representing the impact of applying the duplication onto the operand stack.
        opcode - The opcode that represents the manipulation.
    • Method Detail

      • values

        public static Duplication[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
        for (Duplication c : Duplication.values())
            System.out.println(c);
        
        Returns:
        an array containing the constants of this enum type, in the order they are declared
      • valueOf

        public static Duplication valueOf​(java.lang.String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null
      • of

        public static Duplication of​(TypeDefinition typeDefinition)
        Duplicates a value given its type.
        Parameters:
        typeDefinition - The type to be duplicated.
        Returns:
        A stack manipulation that duplicates the given type.
      • flipOver

        public abstract StackManipulation flipOver​(TypeDefinition typeDefinition)
        Creates a duplication that flips the stack's top value over the second stack element.
        Parameters:
        typeDefinition - The type of the second element on the operand stack.
        Returns:
        A stack manipulation that represents such a duplication flip.
      • isValid

        public boolean isValid()
        Determines if this stack manipulation is valid.
        Specified by:
        isValid in interface StackManipulation
        Returns:
        If false, this manipulation cannot be applied and should throw an exception.
      • apply

        public StackManipulation.Size apply​(org.objectweb.asm.MethodVisitor methodVisitor,
                                            Implementation.Context implementationContext)
        Applies the stack manipulation that is described by this instance.
        Specified by:
        apply in interface StackManipulation
        Parameters:
        methodVisitor - The method visitor used to write the method implementation to.
        implementationContext - The context of the current implementation.
        Returns:
        The changes to the size of the operand stack that are implied by this stack manipulation.