de.fub.bytecode.generic
Class Select

java.lang.Object
  |
  +--de.fub.bytecode.generic.Instruction
        |
        +--de.fub.bytecode.generic.BranchInstruction
              |
              +--de.fub.bytecode.generic.Select

All Implemented Interfaces:

java.lang.Cloneable, InstructionTargeter, java.io.Serializable, StackProducer, VariableLengthInstruction

Direct Known Subclasses:

LOOKUPSWITCH, TABLESWITCH

public abstract class Select

extends BranchInstruction

implements VariableLengthInstruction, StackProducer

Select - Abstract super class for LOOKUPSWITCH and TABLESWITCH instructions.

Version:

$Id: Select.java,v 1.4 2001/07/03 08:20:18 dahm Exp $

Author:

M. Dahm

See Also:

LOOKUPSWITCH, TABLESWITCH, InstructionList, Serialized Form

Field Summary

protected int	fixed_length
protected int[]	indices
protected int[]	match
protected int	match_length
protected int	padding
protected InstructionHandle[]	targets

Fields inherited from class de.fub.bytecode.generic.BranchInstruction

index, position, target

Fields inherited from class de.fub.bytecode.generic.Instruction

length, opcode

Method Summary

boolean	containsTarget(InstructionHandle ih)
void	dump(java.io.DataOutputStream out) Dump instruction as byte code to stream out.
int[]	getIndices()
int[]	getMatchs()
InstructionHandle[]	getTargets()
protected void	initFromFile(ByteSequence bytes, boolean wide) Read needed data (e.g.
void	setTarget(int i, InstructionHandle target) Set branch target for `i'th case
java.lang.String	toString(boolean verbose) Long output format: <position in byte code> <name of opcode> "["<opcode number>"]" "("<length of instruction>")" "<"<target instruction>">" "@"<branch target offset>
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.
void	updateTarget(InstructionHandle old_ih, InstructionHandle new_ih)

Methods inherited from class de.fub.bytecode.generic.BranchInstruction

getIndex, getTarget, getTargetOffset, getTargetOffset, setTarget

Methods inherited from class de.fub.bytecode.generic.Instruction

accept, consumeStack, consumeStack, copy, getLength, getOpcode, getTag, produceStack, produceStack, readInstruction, toString, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface de.fub.bytecode.generic.StackProducer

produceStack

Field Detail

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 Detail

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(java.io.DataOutputStream out)
          throws java.io.IOException

Dump instruction as byte code to stream out.

Overrides:

dump in class BranchInstruction

Parameters:

out - Output stream

initFromFile

protected void initFromFile(ByteSequence bytes,
                            boolean wide)
                     throws java.io.IOException

Read needed data (e.g. index) from file.

Overrides:

initFromFile in class BranchInstruction

Following copied from class: de.fub.bytecode.generic.BranchInstruction

Parameters:

bytes - input stream

wide - wide prefix?

See Also:

InstructionList

toString

public java.lang.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

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)

Overrides:

updateTarget in class BranchInstruction

Parameters:

old_ih - old target

new_ih - new target

containsTarget

public boolean containsTarget(InstructionHandle ih)

Overrides:

containsTarget in class BranchInstruction

Returns:

true, if ih is target of this instruction

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