org.jikesrvm.mm.mmtk

Class ScanStatics

java.lang.Object

org.jikesrvm.mm.mmtk.ScanStatics

public final class ScanStatics
extends Object

Class that determines all JTOC slots (statics) that hold references

Field Summary

Fields

Modifier and Type	Field and Description
private static int	chunkSizeMask Mask used when calculating the chunkSize to ensure chunks are 64bit aligned on 64bit architectures
private static int	refSlotSize Size in 32bits words of a JTOC slot (ie 32bit addresses = 1, 64bit addresses =2)

Constructor Summary

Constructors

Constructor and Description
ScanStatics()

Method Summary

Modifier and Type	Method and Description
private static void	checkReference(Address refaddr, int slot) Check that a reference encountered during scanning is valid.
static void	scanStatics(TraceLocal trace) Scan static variables (JTOC) for object references.

Methods inherited from class java.lang.Object

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

Field Detail

refSlotSize

private static final int refSlotSize

Size in 32bits words of a JTOC slot (ie 32bit addresses = 1, 64bit addresses =2)

chunkSizeMask

private static final int chunkSizeMask

Mask used when calculating the chunkSize to ensure chunks are 64bit aligned on 64bit architectures

Constructor Detail

ScanStatics

public ScanStatics()

Method Detail

scanStatics

public static void scanStatics(TraceLocal trace)

Scan static variables (JTOC) for object references. Executed by all GC threads in parallel, with each doing a portion of the JTOC.

Parameters:

trace - the trace to use for scanning

checkReference

private static void checkReference(Address refaddr,
                                   int slot)

Check that a reference encountered during scanning is valid. If the reference is invalid, dump stack and die.

Parameters:

refaddr - The address of the reference in question.

slot - the index of the slot. This is necessary to trace where the reference came from in case it turns out to be invalid.