avrora.sim.util
Class BranchCounter

java.lang.Object
  avrora.sim.Simulator.Probe.Empty
      avrora.sim.util.BranchCounter

All Implemented Interfaces:

Simulator.Probe

public class BranchCounter

extends Simulator.Probe.Empty

The BranchCounter class is a profiling probe that can be inserted at a branch instruction to count the number of times the branch is taken and not taken. It demonstrates the ability to inspect the state of the program after the execution of a program. It determines whether the branch was taken by inspecting the program counter of the new state. If the program counter is not equal to the instruction following the branch, then the branch was taken.

See Also:

Counter

Nested Class Summary

Nested classes inherited from class avrora.sim.Simulator.Probe

Simulator.Probe.Empty

Field Summary

int	nottakenCount This field tracks the number of times the branch is not taken.
int	takenCount This field tracks the number of times the branch is taken.

Constructor Summary

BranchCounter()

Method Summary

void	fireAfter(State state, int pc) The fireAfter() method is called after the probed instruction executes.

Methods inherited from class avrora.sim.Simulator.Probe.Empty

fireBefore

Methods inherited from class java.lang.Object

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

Field Detail

takenCount

public int takenCount

This field tracks the number of times the branch is taken. It is incremented in the fireAfter method if the branch was taken.

nottakenCount

public int nottakenCount

This field tracks the number of times the branch is not taken. It is incremented in the fireAfter method if the branch was not taken.

Constructor Detail

BranchCounter

public BranchCounter()

Method Detail

fireAfter

public void fireAfter(State state,
                      int pc)

The fireAfter() method is called after the probed instruction executes. In the implementation of the branch counter, the counter determines whether the branch was taken by inspecting the program counter of the new state. If the program counter is not equal to the instruction following the branch, then the branch was taken.

Specified by:

fireAfter in interface Simulator.Probe

Overrides:

fireAfter in class Simulator.Probe.Empty

Parameters:

state - the state of the simulation

pc - the address at which this instruction resides