org.jikesrvm.compilers.baseline

Class EdgeCounts

java.lang.Object

org.jikesrvm.compilers.baseline.EdgeCounts

All Implemented Interfaces:

Callbacks.ExitMonitor

public final class EdgeCounts
extends Object
implements Callbacks.ExitMonitor

A repository of edge counters for bytecode-level edge conditional branches.

Field Summary

Fields

Modifier and Type	Field and Description
private static int[][]	data Array of edge count data.
static int	NOT_TAKEN Adjustment to offset in data from the bytecode index for not taken branch counts
private static boolean	registered For a non-adaptive system, have we registered the exit call back yet?
static int	TAKEN Adjustment to offset in data from the bytecode index for taken branch counts

Constructor Summary

Constructors

Constructor and Description
EdgeCounts()

Method Summary

Modifier and Type	Method and Description
private static void	allocateCounters(int id, int numEntries)
static void	allocateCounters(NormalMethod m, int numEntries)
static void	dumpCounts() Dump all the profile data to the file BaselineCompiler.options.PROFILE_EDGE_COUNTER_FILE
static void	dumpCounts(String fn) Dump all profile data to the given file
static BranchProfiles	getBranchProfiles(NormalMethod m)
static void	loadCountsFromFileIfAvailable(String inputFileName) Attempt to use edge counts from an input file.
void	notifyExit(int value) Notify the monitor that the VM is about to exit.
static void	readCounts(String fn)

Methods inherited from class java.lang.Object

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

Field Detail

TAKEN

public static final int TAKEN

Adjustment to offset in data from the bytecode index for taken branch counts

See Also:

Constant Field Values

NOT_TAKEN

public static final int NOT_TAKEN

Adjustment to offset in data from the bytecode index for not taken branch counts

See Also:

Constant Field Values

registered

private static boolean registered

For a non-adaptive system, have we registered the exit call back yet?

data

private static int[][] data

Array of edge count data. The first index is the ID of the method, the second index is the bytecode index within the method plus either TAKEN or NOT_TAKEN. The value is the count of the number of times a particular branch event occurs.

Constructor Detail

EdgeCounts

public EdgeCounts()

Method Detail

notifyExit

public void notifyExit(int value)

Description copied from interface: Callbacks.ExitMonitor

Notify the monitor that the VM is about to exit.

Specified by:

notifyExit in interface Callbacks.ExitMonitor

Parameters:

value - the exit value

loadCountsFromFileIfAvailable

public static void loadCountsFromFileIfAvailable(String inputFileName)

Attempt to use edge counts from an input file. If the source file is not null, then clear any existing counts and read in new counts from the file provided.

Parameters:

inputFileName - The name of the edge count file (possibly null)

allocateCounters

public static void allocateCounters(NormalMethod m,
                                    int numEntries)

allocateCounters

private static void allocateCounters(int id,
                                     int numEntries)

getBranchProfiles

public static BranchProfiles getBranchProfiles(NormalMethod m)

dumpCounts

public static void dumpCounts()

Dump all the profile data to the file BaselineCompiler.options.PROFILE_EDGE_COUNTER_FILE

dumpCounts

public static void dumpCounts(String fn)

Dump all profile data to the given file

Parameters:

fn - output file name

readCounts

public static void readCounts(String fn)