sun.jvm.hotspot.memory

Class Generation

java.lang.Object

sun.jvm.hotspot.runtime.VMObject

sun.jvm.hotspot.memory.Generation

Direct Known Subclasses:

CardGeneration, DefNewGeneration

public abstract class Generation
extends VMObject

The (supported) Generation hierarchy currently looks like this:

• Generation
  • CardGeneration
    • OneContigSpaceCardGeneration
      • TenuredGeneration
  • DefNewGeneration

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Generation.Name
static class	Generation.StatRecord

Field Summary

Fields

Modifier and Type	Field and Description
protected static int	K

Fields inherited from class sun.jvm.hotspot.runtime.VMObject

addr

Constructor Summary

Constructors

Constructor and Description
Generation(Address addr)

Method Summary

Modifier and Type	Method and Description
abstract long	capacity() The maximum number of object bytes the generation can currently hold.
abstract long	contiguousAvailable() The largest number of contiguous free words in the generation, including expansion.
abstract long	free() The number of free bytes in the gen.
int	invocations()
boolean	isIn(Address p)
boolean	isInReserved(Address p) Returns "TRUE" iff "p" points into the reserved area of the generation.
Generation.Name	kind()
int	level()
abstract java.lang.String	name()
void	print()
abstract void	printOn(java.io.PrintStream tty)
MemRegion	reserved()
void	spaceIterate(SpaceClosure blk) Equivalent to spaceIterate(blk, false)
abstract void	spaceIterate(SpaceClosure blk, boolean usedOnly) Iteration - do not use for time critical operations
GenerationSpec	spec()
abstract long	used() The number of used bytes in the gen.
MemRegion	usedRegion() Returns a region guaranteed to contain all the objects in the generation.
protected VirtualSpace	virtualSpace()

Methods inherited from class sun.jvm.hotspot.runtime.VMObject

equals, getAddress, hashCode, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

K

protected static final int K

See Also:

Constant Field Values

Constructor Detail

Generation

public Generation(Address addr)

Method Detail

kind

public Generation.Name kind()

spec

public GenerationSpec spec()

level

public int level()

invocations

public int invocations()

capacity

public abstract long capacity()

The maximum number of object bytes the generation can currently hold.

used

public abstract long used()

The number of used bytes in the gen.

free

public abstract long free()

The number of free bytes in the gen.

contiguousAvailable

public abstract long contiguousAvailable()

The largest number of contiguous free words in the generation, including expansion. (VM's version assumes it is called at a safepoint.)

reserved

public MemRegion reserved()

usedRegion

public MemRegion usedRegion()

Returns a region guaranteed to contain all the objects in the generation.

isIn

public boolean isIn(Address p)

isInReserved

public boolean isInReserved(Address p)

Returns "TRUE" iff "p" points into the reserved area of the generation.

virtualSpace

protected VirtualSpace virtualSpace()

name

public abstract java.lang.String name()

spaceIterate

public void spaceIterate(SpaceClosure blk)

Equivalent to spaceIterate(blk, false)

spaceIterate

public abstract void spaceIterate(SpaceClosure blk,
                                  boolean usedOnly)

Iteration - do not use for time critical operations

print

public void print()

printOn

public abstract void printOn(java.io.PrintStream tty)