Class Select

java.lang.Object
org.apache.bcel.generic.Instruction
org.apache.bcel.generic.BranchInstruction
org.apache.bcel.generic.Select
All Implemented Interfaces:
Serializable, Cloneable, InstructionTargeter, StackConsumer, VariableLengthInstruction
Direct Known Subclasses:
LOOKUPSWITCH, TABLESWITCH
public abstract class Select extends BranchInstruction implements VariableLengthInstruction, StackConsumer
Select - Abstract super class for LOOKUPSWITCH and TABLESWITCH instructions.

We use our super's target property as the default target.

See Also:

  • Field Details

    • match

      protected int[] match

    • indices

      protected int[] indices

    • targets

      protected InstructionHandle[] targets

    • fixed_length

      protected int fixed_length

    • match_length

      protected int match_length

    • padding

      protected int padding

  • Method Details

    • updatePosition

      protected int updatePosition(int offset, int max_offset)
      Since this is a variable length instruction, it may shift the following instructions which then need to update their position. Called by InstructionList.setPositions when setting the position for every instruction. In the presence of variable length instructions `setPositions' performs multiple passes over the instruction list to calculate the correct (byte) positions and offsets by calling this function.
      Overrides:
      updatePosition in class BranchInstruction
      Parameters:
      offset - additional offset caused by preceding (variable length) instructions
      max_offset - the maximum offset that may be caused by these instructions
      Returns:
      additional offset caused by possible change of this instruction's length

    • dump

      public void dump(DataOutputStream out) throws IOException
      Dump instruction as byte code to stream out.
      Overrides:
      dump in class BranchInstruction
      Parameters:
      out - Output stream
      Throws:
      IOException

    • initFromFile

      protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
      Read needed data (e.g. index) from file.
      Overrides:
      initFromFile in class BranchInstruction
      Parameters:
      bytes - input stream
      wide - wide prefix?
      Throws:
      IOException - may be thrown if the implementation needs to read data from the file
      See Also:

    • toString

      public String toString(boolean verbose)
      Description copied from class: BranchInstruction
      Long output format: <position in byte code> <name of opcode> "["<opcode number>"]" "("<length of instruction>")" "<"<target instruction>">" "@"<branch target offset>
      Overrides:
      toString in class BranchInstruction
      Parameters:
      verbose - long/short format switch
      Returns:
      mnemonic for instruction

    • setTarget

      public void setTarget(int i, InstructionHandle target)
      Set branch target for `i'th case

    • updateTarget

      public void updateTarget(InstructionHandle old_ih, InstructionHandle new_ih)
      Specified by:
      updateTarget in interface InstructionTargeter
      Overrides:
      updateTarget in class BranchInstruction
      Parameters:
      old_ih - old target
      new_ih - new target

    • containsTarget

      public boolean containsTarget(InstructionHandle ih)
      Specified by:
      containsTarget in interface InstructionTargeter
      Overrides:
      containsTarget in class BranchInstruction
      Returns:
      true, if ih is target of this instruction

    • clone

      protected Object clone() throws CloneNotSupportedException
      Overrides:
      clone in class Object
      Throws:
      CloneNotSupportedException

    • getMatchs

      public int[] getMatchs()
      Returns:
      array of match indices

    • getIndices

      public int[] getIndices()
      Returns:
      array of match target offsets

    • getTargets

      public InstructionHandle[] getTargets()
      Returns:
      array of match targets