Package serp.bytecode

Class MathInstruction

  • All Implemented Interfaces:
    BCEntity, VisitAcceptor

    public class MathInstruction
    extends TypedInstruction
    One of the math operations defined in the Constants interface. Changing the type or operation of the instruction will automatically update the underlying opcode.
    • Field Detail

      • _mappings

        private static final java.lang.Class[][] _mappings
      • _op

        private int _op
      • _type

        private java.lang.String _type
    • Constructor Detail

      • MathInstruction

        MathInstruction​(Code owner)
      • MathInstruction

        MathInstruction​(Code owner,
                        int opcode)
    • Method Detail

      • getStackChange

        public int getStackChange()
        Description copied from class: Instruction
        Return the number of stack positions this instruction pushes or pops during its execution.
        Overrides:
        getStackChange in class Instruction
        Returns:
        0 if the stack is not affected by this instruction, a positive number if it pushes onto the stack, and a negative number if it pops from the stack
      • getLogicalStackChange

        public int getLogicalStackChange()
        Description copied from class: Instruction
        Return the logical number of stack positions changed by this instruction. In other words, ignore weirdness with longs and doubles taking two stack positions.
        Overrides:
        getLogicalStackChange in class Instruction
      • getTypeName

        public java.lang.String getTypeName()
        Description copied from class: TypedInstruction
        Return the type name for this instruction. If the type has not been set, this method will return null.
        Specified by:
        getTypeName in class TypedInstruction
      • setType

        public TypedInstruction setType​(java.lang.String type)
        Description copied from class: TypedInstruction
        Set the type of this instruction. Types that have no direct support will be converted accordingly.
        Specified by:
        setType in class TypedInstruction
        Returns:
        this instruction, for method chaining
      • setOperation

        public MathInstruction setOperation​(int operation)
        Set the math operation to be performed. This should be one of the math constant defined in Constants.
        Returns:
        this instruction, for method chaining
      • getOperation

        public int getOperation()
        Return the operation for this math instruction; will be one of the math constant defined in Constants, or -1 if unset.
      • equalsInstruction

        public boolean equalsInstruction​(Instruction other)
        MathInstructions are equal if they have the same operation and type, or the operation and type of either is unset.
        Overrides:
        equalsInstruction in class Instruction
      • acceptVisit

        public void acceptVisit​(BCVisitor visit)
        Description copied from interface: VisitAcceptor
        Accept a visit from a BCVisitor, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this one.
        Specified by:
        acceptVisit in interface VisitAcceptor
        Overrides:
        acceptVisit in class Instruction