avrora.sim.util
Class ProgramTimeProfiler

java.lang.Object
  avrora.sim.util.ProgramTimeProfiler

All Implemented Interfaces:

Simulator.Probe

public class ProgramTimeProfiler

extends java.lang.Object

implements Simulator.Probe

The ProgramProfiler class implements a probe that can be used to profile pieces of the program or the whole program. It maintains a simple array of long that stores the cumulative cycles consumed for each instruction in the program.

See Also:

Counter

Nested Class Summary

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

Simulator.Probe.Empty

Field Summary

long[]	itime The itime field stores the cumulative number of cycles consumed for each instruction in the program.
Program	program The program field stores a reference to the program being profiled.
protected long	timeBegan

Constructor Summary

ProgramTimeProfiler(Program p)
The constructor for the program profiler constructs the required internal state to store the cycle counts of each instruction.

Method Summary

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

Methods inherited from class java.lang.Object

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

Field Detail

program

public final Program program

The program field stores a reference to the program being profiled.

itime

public final long[] itime

The itime field stores the cumulative number of cycles consumed for each instruction in the program. It is indexed by byte addresses. Thus itime[addr] corresponds to the time for the instruction at program.getInstr(addr).

timeBegan

protected long timeBegan

Constructor Detail

ProgramTimeProfiler

public ProgramTimeProfiler(Program p)

The constructor for the program profiler constructs the required internal state to store the cycle counts of each instruction.

Parameters:

p - the program to profile

Method Detail

fireBefore

public void fireBefore(State state,
                       int pc)

The fireBefore() method is called before the probed instruction executes. In the implementation of the program profiler, it simply remembers the timestamp at the beginning of the instruction.

Specified by:

fireBefore in interface Simulator.Probe

Parameters:

state - the state of the simulation

pc - the address at which this instruction resides

fireAfter

public void fireAfter(State state,
                      int pc)

The fireAfter() method is called after the probed instruction executes. In the implementation of the profiler, it counts the number of cycles consumed in executing this instruction and adds it to the count for this instruction.

Specified by:

fireAfter in interface Simulator.Probe

Parameters:

state - the state of the simulation

pc - the address at which this instruction resides