Package serp.bytecode

Class JumpInstruction

java.lang.Object

serp.bytecode.Instruction

serp.bytecode.JumpInstruction

All Implemented Interfaces:

BCEntity, InstructionPtr, VisitAcceptor

Direct Known Subclasses:

GotoInstruction, IfInstruction, LookupSwitchInstruction, SwitchInstruction, TableSwitchInstruction

public abstract class JumpInstruction
extends Instruction
implements InstructionPtr

An instruction that specifies a position in the code block to jump to. Examples include go2, jsr, etc.

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.
boolean	equalsInstruction(Instruction other)	JumpInstructions are equal if they represent the same operation and the instruction they jump to is the same, or if the jump Instruction of either is unset.
int	getOffset()
Instruction	getTarget()	Get the current target instruction to jump to, if it has been set.
void	replaceTarget(Instruction oldTarget, Instruction newTarget)	Replace the given old, likely invalid, target with a new target.
void	setOffset(int offset)
JumpInstruction	setTarget(Instruction instruction)	Set the instruction to jump to; the instruction must already be added to the code block.
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.Instruction

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

getTarget

public Instruction getTarget()

Get the current target instruction to jump to, if it has been set.

setTarget

public JumpInstruction setTarget(Instruction instruction)

Set the instruction to jump to; the instruction must already be added to the code block.

Returns:

this instruction, for method chaining

equalsInstruction

public boolean equalsInstruction(Instruction other)

JumpInstructions are equal if they represent the same operation and the instruction they jump to is the same, or if the jump Instruction of either is unset.

Overrides:

equalsInstruction in class Instruction

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

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

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 Instruction

setOffset

public void setOffset(int offset)

getOffset

public int getOffset()