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Allocator
Class ObjectLayout  

java.lang.Object
  Allocator.ObjectLayout

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public abstract class ObjectLayout

extends java.lang.Object

This interface contains constants that define the joeq object layout. You can play with these constants to experiment with different object layouts.

Version:

$Id: ObjectLayout.java,v 1.10 2003/05/12 10:04:52 joewhaley Exp $

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Field Summary
static int	ARRAY_ELEMENT_OFFSET           Offset of array element 0, in bytes.
static int	ARRAY_HEADER_SIZE           Size of array header, in bytes.
static int	ARRAY_LENGTH_OFFSET           Offset of array length word, in bytes.
static int	GC_BIT           Bit in object header for use by GC.
static int	HASHED           Object has been hashed.
static int	HASHED_MOVED           Object has been hashed and later moved.
static int	LOCK_COUNT_INC           Value to add to status word to increment lock count by one.
static int	LOCK_COUNT_MASK           Mask of the lock count in the status word.
static int	LOCK_COUNT_SHIFT           Bit location of lock count in the status word.
static int	LOCK_EXPANDED           Lock has been expanded.
static int	OBJ_HEADER_SIZE           Size of (non-array) object header, in bytes.
static int	STATUS_FLAGS_MASK           Mask for status flags.
static int	STATUS_WORD_OFFSET           Offset of status word, in bytes.
static int	THREAD_ID_MASK           Mask of the thread id in the status word.
static int	THREAD_ID_SHIFT           Bit location of thread id in the status word.
static int	VTABLE_OFFSET           Offset of vtable, in bytes.

 

Constructor Summary

ObjectLayout()

 

Methods inherited from class java.lang.Object

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

 

Field Detail

ARRAY_LENGTH_OFFSET

public static final int ARRAY_LENGTH_OFFSET

Offset of array length word, in bytes.

See Also:

Constant Field Values

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STATUS_WORD_OFFSET

public static final int STATUS_WORD_OFFSET

Offset of status word, in bytes.

See Also:

Constant Field Values

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VTABLE_OFFSET

public static final int VTABLE_OFFSET

Offset of vtable, in bytes.

See Also:

Constant Field Values

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ARRAY_ELEMENT_OFFSET

public static final int ARRAY_ELEMENT_OFFSET

Offset of array element 0, in bytes.

See Also:

Constant Field Values

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OBJ_HEADER_SIZE

public static final int OBJ_HEADER_SIZE

Size of (non-array) object header, in bytes.

See Also:

Constant Field Values

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ARRAY_HEADER_SIZE

public static final int ARRAY_HEADER_SIZE

Size of array header, in bytes.

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Constant Field Values

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HASHED

public static final int HASHED

Object has been hashed. If it moves, we need to store the old address.

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Constant Field Values

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HASHED_MOVED

public static final int HASHED_MOVED

Object has been hashed and later moved. The hash code is stored just past the object.

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Constant Field Values

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GC_BIT

public static final int GC_BIT

Bit in object header for use by GC.

See Also:

Constant Field Values

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STATUS_FLAGS_MASK

public static final int STATUS_FLAGS_MASK

Mask for status flags.

See Also:

Constant Field Values

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THREAD_ID_SHIFT

public static final int THREAD_ID_SHIFT

Bit location of thread id in the status word.

See Also:

Constant Field Values

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THREAD_ID_MASK

public static final int THREAD_ID_MASK

Mask of the thread id in the status word.

See Also:

Constant Field Values

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LOCK_COUNT_MASK

public static final int LOCK_COUNT_MASK

Mask of the lock count in the status word.

See Also:

Constant Field Values

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LOCK_COUNT_INC

public static final int LOCK_COUNT_INC

Value to add to status word to increment lock count by one.

See Also:

Constant Field Values

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LOCK_COUNT_SHIFT

public static final int LOCK_COUNT_SHIFT

Bit location of lock count in the status word.

See Also:

Constant Field Values

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LOCK_EXPANDED

public static final int LOCK_EXPANDED

Lock has been expanded. Masking out this value and the status flags mask gives the address of the expanded lock structure.

See Also:

Constant Field Values

Constructor Detail

ObjectLayout

public ObjectLayout()

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