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.
    Author:
    Abe White

    • 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