org.datanucleus.asm

Class Label

java.lang.Object

org.datanucleus.asm.Label

public class Label
extends Object

A label represents a position in the bytecode of a method. Labels are used for jump, goto, and switch instructions, and for try catch blocks. A label designates the instruction that is just after. Note however that there can be other elements between a label and the instruction it designates (such as other labels, stack map frames, line numbers, etc.).

Author:

Eric Bruneton

Field Summary

Fields

Modifier and Type	Field and Description
Object	info Field used to associate user information to a label.

Constructor Summary

Constructors

Constructor and Description
Label() Constructs a new label.

Method Summary

Methods

Modifier and Type	Method and Description
int	getOffset() Returns the offset corresponding to this label.
String	toString() Returns a string representation of this label.

Methods inherited from class java.lang.Object

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

Field Detail

info

public Object info

Field used to associate user information to a label. Warning: this field is used by the ASM tree package. In order to use it with the ASM tree package you must override the org.datanucleus.asm.tree.MethodNode#getLabelNode method.

Constructor Detail

Label

public Label()

Constructs a new label.

Method Detail

getOffset

public int getOffset()

Returns the offset corresponding to this label. This offset is computed from the start of the method's bytecode. This method is intended for Attribute sub classes, and is normally not needed by class generators or adapters.

Returns:

the offset corresponding to this label.

Throws:

IllegalStateException - if this label is not resolved yet.

toString

public String toString()

Returns a string representation of this label.

Overrides:

toString in class Object

Returns:

a string representation of this label.