com.go.trove.classfile
Interface Label

All Superinterfaces:

java.lang.Comparable, Location

public interface Label

extends Location

A label is used to manipulate a branch instruction's branch location. A label has a location address. Branch instructions have origin addresses, which contain the address of the opcode that performs the conditional or unconditional branch.

Labels are generated by factory methods in the CodeBuilder class. If a label has any origin addresses, its location address must be set by the time the CodeBuilder's class file is output.

Version:

22 , 9/07/00

Author:

Brian S O'Neill

See Also:

CodeBuilder

Method Summary

int	getLocation() Returns -1 if the location isn't yet fully resolved.
Label	setLocation() Sets the location of a label to be at the current postion in the code being generated.

Methods inherited from interface java.lang.Comparable

compareTo

Method Detail

setLocation

public Label setLocation()

Sets the location of a label to be at the current postion in the code being generated.

Returns:

the Label itself.

getLocation

public int getLocation()
                throws java.lang.IllegalStateException

Returns -1 if the location isn't yet fully resolved.

Specified by:

getLocation in interface Location

Throws:

java.lang.IllegalStateException - when the location is unknown because the setLocation method was never called.