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 Details

    • _mappings

      private static final Class[][] _mappings
    • _op

      private int _op
    • _type

      private String _type
  • Constructor Details

    • MathInstruction

      MathInstruction(Code owner)
    • MathInstruction

      MathInstruction(Code owner, int opcode)
  • 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
    • read

      void read(Instruction orig)
      Description copied from class: Instruction
      Copy the given instruction data.
      Overrides:
      read in class Instruction