Package serp.bytecode

Class JumpInstruction

java.lang.Object
serp.bytecode.CodeEntry
serp.bytecode.Instruction
serp.bytecode.JumpInstruction
All Implemented Interfaces:
BCEntity, InstructionPtr, VisitAcceptor
Direct Known Subclasses:
GotoInstruction, IfInstruction, LookupSwitchInstruction, SwitchInstruction, TableSwitchInstruction
public abstract class JumpInstruction extends Instruction implements InstructionPtr
An instruction that specifies a position in the code block to jump to. Examples include go2, jsr, etc.

  • Field Details

  • Constructor Details

    • JumpInstruction

      JumpInstruction(Code owner, int opcode)

  • Method Details

    • getTarget

      public Instruction getTarget()
      Get the current target instruction to jump to, if it has been set.

    • setTarget

      public JumpInstruction setTarget(Instruction instruction)
      Set the instruction to jump to; the instruction must already be added to the code block.
      Returns:
      this instruction, for method chaining

    • equalsInstruction

      public boolean equalsInstruction(Instruction other)
      JumpInstructions are equal if they represent the same operation and the instruction they jump to is the same, or if the jump Instruction of either is unset.
      Overrides:
      equalsInstruction in class Instruction

    • updateTargets

      public void updateTargets()
      Description copied from interface: InstructionPtr
      Use the byte indexes read from the class file to calculate and set references to the target instruction(s) for this ptr. This method will be called after the byte code has been read in for the first time and before it is written after modification.
      Specified by:
      updateTargets in interface InstructionPtr

    • replaceTarget

      public void replaceTarget(Instruction oldTarget, Instruction newTarget)
      Description copied from interface: InstructionPtr
      Replace the given old, likely invalid, target with a new target. The new target Instruction is guaranteed to be in the same code block as this InstructionPtr.
      Specified by:
      replaceTarget in interface InstructionPtr

    • 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

    • read

      void read(DataInput in) throws IOException
      Description copied from class: Instruction
      Read the arguments for this opcode from the given stream. This method should be overridden by opcodes that take arguments.
      Overrides:
      read in class Instruction
      Throws:
      IOException

    • write

      void write(DataOutput out) throws IOException
      Description copied from class: Instruction
      Write the arguments for this opcode to the given stream. This method should be overridden by opcodes that take arguments.
      Overrides:
      write in class Instruction
      Throws:
      IOException

    • setOffset

      public void setOffset(int offset)

    • getOffset

      public int getOffset()