Package serp.bytecode

Class SwitchInstruction

    • Constructor Detail

      • SwitchInstruction

        public SwitchInstruction​(Code owner,
                                 int opcode)
    • Method Detail

      • getOffsets

        public int[] getOffsets()
        Returns the current byte offsets for the different switch cases in this Instruction.
      • setOffsets

        public void setOffsets​(int[] offsets)
        Sets the offsets for the instructions representing the different switch statement cases. WARNING: these offsets will not be changed in the event that the code is modified following this call. It is typically a good idea to follow this call with a call to updateTargets as soon as the instructions at the given offsets are valid, at which point the Instructions themselves will be used as the targets and the offsets will be updated as expected.
      • countTargets

        public int countTargets()
      • getTargets

        public Instruction[] getTargets()
        Return the targets for this switch, or empty array if not set.
      • setTargets

        public SwitchInstruction setTargets​(Instruction[] targets)
        Set the jump points for this switch.
        Returns:
        this instruction, for method chaining
      • addTarget

        public SwitchInstruction addTarget​(Instruction target)
        Add a target to this switch.
        Returns:
        this instruction, for method chaining
      • 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
      • 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
        Overrides:
        updateTargets in class JumpInstruction
      • setCases

        public SwitchInstruction setCases​(int[] matches,
                                          Instruction[] targets)
        Set the match-jumppt pairs for this switch.
        Returns:
        this instruction, for method chaining
      • addCase

        public SwitchInstruction addCase​(int match,
                                         Instruction target)
        Add a case to this switch.
        Returns:
        this instruction, for method chaining
      • getMatches

        public abstract int[] getMatches()