Package serp.bytecode

Class MathInstruction

java.lang.Object
serp.bytecode.Instruction
serp.bytecode.TypedInstruction
serp.bytecode.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 Details

    • 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 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(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