org.apache.bcel.generic

Class Select

java.lang.Object

org.apache.bcel.generic.Instruction

org.apache.bcel.generic.BranchInstruction

org.apache.bcel.generic.Select

All Implemented Interfaces:

Cloneable, InstructionTargeter, StackConsumer, StackProducer, VariableLengthInstruction

Direct Known Subclasses:

LOOKUPSWITCH, TABLESWITCH

public abstract class Select
extends BranchInstruction
implements VariableLengthInstruction, StackConsumer, StackProducer

Select - Abstract super class for LOOKUPSWITCH and TABLESWITCH instructions.

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

See Also:

LOOKUPSWITCH, TABLESWITCH, InstructionList

Field Summary

Fields

Modifier and Type	Field and Description
protected int	fixed_length Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter
protected int[]	indices Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter
protected int[]	match Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter
protected int	match_length Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter
protected int	padding Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter
protected InstructionHandle[]	targets Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter

Fields inherited from class org.apache.bcel.generic.BranchInstruction

index, position, target

Fields inherited from class org.apache.bcel.generic.Instruction

length, opcode

Method Summary

Modifier and Type	Method and Description
protected Object	clone()
boolean	containsTarget(InstructionHandle ih) Checks whether this targeter targets the specified instruction handle.
void	dump(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
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) Replaces the target of this targeter from this old handle to the new handle.

Methods inherited from class org.apache.bcel.generic.BranchInstruction

getIndex, getPosition, getTarget, getTargetOffset, getTargetOffset, setIndex, setPosition, setTarget

Methods inherited from class org.apache.bcel.generic.Instruction

accept, consumeStack, copy, equals, getComparator, getLength, getName, getOpcode, hashCode, isValidByte, isValidShort, produceStack, readInstruction, setComparator, toString, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.bcel.generic.StackConsumer

consumeStack

Methods inherited from interface org.apache.bcel.generic.StackProducer

produceStack

Field Detail

match

@Deprecated
protected int[] match

Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter

indices

@Deprecated
protected int[] indices

Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter

targets

@Deprecated
protected InstructionHandle[] targets

Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter

fixed_length

@Deprecated
protected int fixed_length

Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter

match_length

@Deprecated
protected int match_length

Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter

padding

@Deprecated
protected int padding

Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter

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(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:

InstructionList

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)

Description copied from interface: InstructionTargeter

Replaces the target of this targeter from this old handle to the new handle.

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)

Description copied from interface: InstructionTargeter

Checks whether this targeter targets the specified instruction handle.

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