harpoon.IR.Bytecode
Class InSwitch

java.lang.Object
  harpoon.IR.Bytecode.Instr
      harpoon.IR.Bytecode.InCti
          harpoon.IR.Bytecode.InSwitch

All Implemented Interfaces:

HCodeElement, CFGraphable<Instr,harpoon.IR.Bytecode.InstrEdge>, Graph.Node<Instr,harpoon.IR.Bytecode.InstrEdge>, Comparable<Instr>

public class InSwitch
extends InCti

InSwitch is used for the tableswitch and lookupswitch java bytecode instructions. It is a control-transfer instruction. It should have exactly one predecessor. The first successor will be the default target; each subsequent successor corresponds to a case of the switch statement; the match key can be looked up using the key method.

Version:

$Id: InSwitch.java,v 1.3 2002/02/25 21:04:17 cananian Exp $

Author:

C. Scott Ananian <cananian@alumni.princeton.edu>

See Also:

Instr

Field Summary

Fields inherited from class harpoon.IR.Bytecode.Instr

arrayFactory

Constructor Summary

InSwitch(String sourcefile, int linenumber, byte[] code, int pc)
Constructor.

Method Summary

int	key(int index) Returns the case key corresponding to the given branch target index.
String	toString() Return human-readable instruction string.

Methods inherited from class harpoon.IR.Bytecode.InCti

getOpcode

Methods inherited from class harpoon.IR.Bytecode.Instr

compareTo, edgeC, edges, equals, getID, getLineNumber, getSourceFile, hashCode, isPred, isSucc, newEdge, next, next, pred, predC, prev, prev, succ, succC

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

InSwitch

public InSwitch(String sourcefile,
                int linenumber,
                byte[] code,
                int pc)

Constructor. Creates an InSwitch from a chunk of bytecode starting at the given pc.

Throws:

Error - if the opcode at code[pc] doesn't correspond to a tableswitch or lookupswitch.

Method Detail

key

public int key(int index)

Returns the case key corresponding to the given branch target index.

InSwitch.key(n) corresponds to InSwitch.next()[n] for 0.

Throws:

Error - if the default target or an instruction not corresponding to a target is given.

toString

public String toString()

Return human-readable instruction string.

Overrides:

toString in class InCti