Package serp.bytecode

Class LocalVariableInstruction

java.lang.Object
serp.bytecode.Instruction
serp.bytecode.TypedInstruction
serp.bytecode.LocalVariableInstruction
All Implemented Interfaces:
BCEntity, VisitAcceptor
Direct Known Subclasses:
IIncInstruction, LoadInstruction, RetInstruction, StoreInstruction, WideInstruction
public abstract class LocalVariableInstruction extends TypedInstruction
An instruction that has an argument of an index into the local variable table of the current frame. This includes most of the load and store instructions.

The local variable table size is fixed by the maxLocals property of the code block. Long and double types take up 2 local variable indexes.

Parameter values to methods are loaded into the local variable table prior to the execution of the first instruction. The 0 index of the table is set to the instance of the class the method is being invoked on.

Author:
Abe White

  • Method Details

    • 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

    • getLocal

      public int getLocal()
      Return the index of the local variable that this instruction operates on.

    • setLocal

      public LocalVariableInstruction setLocal(int index)
      Set the index of the local variable that this instruction operates on.
      Returns:
      this instruction, for method chaining

    • getParam

      public int getParam()
      Return the parameter that this instruction operates on, or -1 if none.

    • setParam

      public LocalVariableInstruction setParam(int param)
      Set the method parameter that this instruction operates on. This will set both the local index and the type of the instruction based on the current method parameters.

    • getLocalVariable

      public LocalVariable getLocalVariable()
      Return the local variable object this instruction operates on, or null if none.
      See Also:

    • setLocalVariable

      public LocalVariableInstruction setLocalVariable(LocalVariable local)
      Set the local variable object this instruction operates on. This method will set both the type and local index of this instruction from the given local variable.
      Returns:
      this instruction, for method chaining

    • equalsInstruction

      public boolean equalsInstruction(Instruction other)
      Two local variable instructions are equal if the local index they reference is equal or if either index is 0/unset.
      Overrides:
      equalsInstruction in class Instruction