Package serp.bytecode

Class LookupSwitchInstruction

java.lang.Object

serp.bytecode.Instruction

serp.bytecode.JumpInstruction

serp.bytecode.LookupSwitchInstruction

All Implemented Interfaces:

BCEntity, InstructionPtr, VisitAcceptor

public class LookupSwitchInstruction
extends JumpInstruction

The lookupswitch instruction.

Author:

Abe White

Method Summary

Modifier and Type	Method	Description
void	acceptVisit(BCVisitor visit)	Accept a visit from a BCVisitor, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this one.
LookupSwitchInstruction	addCase(int match, Instruction target)	Add a case to this switch.
int	getDefaultOffset()	Synonymous with JumpInstruction.getOffset().
Instruction	getDefaultTarget()	Synonymous with JumpInstruction.getTarget().
int[]	getMatches()	Return the values of the case statements for this switch.
int[]	getOffsets()
int	getStackChange()	Return the number of stack positions this instruction pushes or pops during its execution.
Instruction[]	getTargets()	Return the targets of the case statements for this switch.
void	replaceTarget(Instruction oldTarget, Instruction newTarget)	Replace the given old, likely invalid, target with a new target.
LookupSwitchInstruction	setCases(int[] matches, Instruction[] targets)	Set the match-jumppt pairs for this switch.
LookupSwitchInstruction	setDefaultOffset(int offset)	Synonymous with JumpInstruction.setOffset(int).
LookupSwitchInstruction	setDefaultTarget(Instruction ins)	Synonymous with JumpInstruction.setTarget(serp.bytecode.Instruction).
void	updateTargets()	Use the byte indexes read from the class file to calculate and set references to the target instruction(s) for this ptr.

Methods inherited from class serp.bytecode.JumpInstruction

equalsInstruction, getOffset, getTarget, setOffset, setTarget

Methods inherited from class serp.bytecode.Instruction

getByteIndex, getClassLoader, getCode, getLineNumber, getLogicalStackChange, getName, getOpcode, getPool, getProject, isValid

Methods inherited from class java.lang.Object

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

Methods inherited from interface serp.bytecode.InstructionPtr

getCode

Method Detail

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

getDefaultTarget

public Instruction getDefaultTarget()

Synonymous with JumpInstruction.getTarget().

setDefaultTarget

public LookupSwitchInstruction setDefaultTarget(Instruction ins)

Synonymous with JumpInstruction.setTarget(serp.bytecode.Instruction).

getDefaultOffset

public int getDefaultOffset()

Synonymous with JumpInstruction.getOffset().

setDefaultOffset

public LookupSwitchInstruction setDefaultOffset(int offset)

Synonymous with JumpInstruction.setOffset(int).

setCases

public LookupSwitchInstruction setCases(int[] matches,
                                        Instruction[] targets)

Set the match-jumppt pairs for this switch.

Returns:

this instruction, for method chaining

getOffsets

public int[] getOffsets()

getMatches

public int[] getMatches()

Return the values of the case statements for this switch.

getTargets

public Instruction[] getTargets()

Return the targets of the case statements for this switch.

addCase

public LookupSwitchInstruction addCase(int match,
                                       Instruction target)

Add a case to this switch.

Returns:

this instruction, for method chaining

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

replaceTarget

public void replaceTarget(Instruction oldTarget,
                          Instruction newTarget)

Description copied from interface: InstructionPtr

Replace the given old, likely invalid, target with a new target. The new target Instruction is guaranteed to be in the same code block as this InstructionPtr.

Specified by:

replaceTarget in interface InstructionPtr

Overrides:

replaceTarget in class JumpInstruction

acceptVisit

public void acceptVisit(BCVisitor visit)

Description copied from interface: VisitAcceptor

Accept a visit from a BCVisitor, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this one.

Specified by:

acceptVisit in interface VisitAcceptor

Overrides:

acceptVisit in class JumpInstruction