avrora.sim.util
Class MemoryCounter

java.lang.Object
  avrora.sim.Simulator.Watch.Empty
      avrora.sim.util.MemoryCounter

All Implemented Interfaces:

Simulator.Watch

public class MemoryCounter

extends Simulator.Watch.Empty

The MemoryCounter is the simplest example of memory profiling functionality. When inserted as a watch at a particular memory location, it will simply count the number of reads and writes to that memory location. It is analagous to the Counter probe which is used to count the execution frequency of a particular instruction.

See Also:

Simulator.Watch, Counter

Nested Class Summary

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

Simulator.Watch.Empty

Field Summary

long	rcount The rcount field stores the number of reads encountered for this memory location.
long	wcount The wcount field stores the number of writes encountered for this memory location.

Constructor Summary

MemoryCounter()

Method Summary

void	fireBeforeRead(State state, int data_addr) The fireBeforeRead() method is called before the data address is read by the program.
void	fireBeforeWrite(State state, int data_addr, byte value) The fireBeforeWrite() method is called before the data address is written by the program.

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

fireAfterRead, fireAfterWrite

Methods inherited from class java.lang.Object

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

Field Detail

rcount

public long rcount

The rcount field stores the number of reads encountered for this memory location.

wcount

public long wcount

The wcount field stores the number of writes encountered for this memory location.

Constructor Detail

MemoryCounter

public MemoryCounter()

Method Detail

fireBeforeRead

public void fireBeforeRead(State state,
                           int data_addr)

The fireBeforeRead() method is called before the data address is read by the program. In the implementation of MemoryCounter, it simply increments the count of reads by one.

Specified by:

fireBeforeRead in interface Simulator.Watch

Overrides:

fireBeforeRead in class Simulator.Watch.Empty

Parameters:

state - the state of the simulation

data_addr - the address of the data being referenced

fireBeforeWrite

public void fireBeforeWrite(State state,
                            int data_addr,
                            byte value)

The fireBeforeWrite() method is called before the data address is written by the program. In the implementation of MemoryCounter, it simply increments the count of writes by one.

Specified by:

fireBeforeWrite in interface Simulator.Watch

Overrides:

fireBeforeWrite in class Simulator.Watch.Empty

Parameters:

state - the state of the simulation

data_addr - the address of the data being referenced

value - the value being written to the memory location