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GC
Class GCBits  

java.lang.Object
  GC.GCBits

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public class GCBits

extends java.lang.Object

GCBits PRE-REQUISITE: All the objects and arrays are allocated align8

Version:

$Id: GCBits.java,v 1.11 2003/05/12 10:05:17 joewhaley Exp $

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Field Summary
static Clazz.jq_Class	_class
private  Util.BitString	allocbits           Each bit in allocbits corresponds to 8 bytes on the heap.
protected static int	bitLength
protected  Memory.HeapAddress	blockEnd
protected  Memory.HeapAddress	blockHead
protected static int	byteLength
private  Util.BitString	markbits           Each bit in markbits corresponds to 8 bytes on the heap.

 

Constructor Summary

GCBits(Memory.HeapAddress blockHead, Memory.HeapAddress blockEnd)

 

Method Summary
java.util.HashSet	diff()
boolean	isMarked(Memory.HeapAddress addr)
boolean	isSet(Memory.HeapAddress addr)
void	mark(Memory.HeapAddress addr)
void	set(Memory.HeapAddress addr)
void	unmark(Memory.HeapAddress addr)
void	unset(Memory.HeapAddress addr)

 

Methods inherited from class java.lang.Object

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

 

Field Detail

bitLength

protected static final int bitLength

See Also:

Constant Field Values

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byteLength

protected static final int byteLength

See Also:

Constant Field Values

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blockHead

protected Memory.HeapAddress blockHead

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blockEnd

protected Memory.HeapAddress blockEnd

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allocbits

private final Util.BitString allocbits

Each bit in allocbits corresponds to 8 bytes on the heap. When an object is allocated and aligned on 8 byte boundary, the bit in allocbits corresponding to the starting 8 bytes (including HEADER) of the object is set.

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markbits

private final Util.BitString markbits

Each bit in markbits corresponds to 8 bytes on the heap. When an object is reachable from TraceRootSet, the bit in markbits corresponding to the starting 8 bytes (including HEADER) of the object is set.

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_class

public static final Clazz.jq_Class _class

Constructor Detail

GCBits

public GCBits(Memory.HeapAddress blockHead,
              Memory.HeapAddress blockEnd)

Method Detail

set

public void set(Memory.HeapAddress addr)

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unset

public void unset(Memory.HeapAddress addr)

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isSet

public boolean isSet(Memory.HeapAddress addr)

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mark

public void mark(Memory.HeapAddress addr)

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unmark

public void unmark(Memory.HeapAddress addr)

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isMarked

public boolean isMarked(Memory.HeapAddress addr)

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diff

public java.util.HashSet diff()

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Overview  Package   Class  Use  Deprecated  Index
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SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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