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Allocator
Class ObjectLayout  view ObjectLayout download ObjectLayout.java

java.lang.Object
  extended byAllocator.ObjectLayout

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 $

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.

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Constant Field Values

STATUS_WORD_OFFSET

public static final int STATUS_WORD_OFFSET
Offset of status word, in bytes.

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Constant Field Values

VTABLE_OFFSET

public static final int VTABLE_OFFSET
Offset of vtable, in bytes.

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Constant Field Values

ARRAY_ELEMENT_OFFSET

public static final int ARRAY_ELEMENT_OFFSET
Offset of array element 0, in bytes.

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Constant Field Values

OBJ_HEADER_SIZE

public static final int OBJ_HEADER_SIZE
Size of (non-array) object header, in bytes.

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Constant Field Values

ARRAY_HEADER_SIZE

public static final int ARRAY_HEADER_SIZE
Size of array header, in bytes.

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Constant Field Values

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

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

GC_BIT

public static final int GC_BIT
Bit in object header for use by GC.

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Constant Field Values

STATUS_FLAGS_MASK

public static final int STATUS_FLAGS_MASK
Mask for status flags.

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Constant Field Values

THREAD_ID_SHIFT

public static final int THREAD_ID_SHIFT
Bit location of thread id in the status word.

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Constant Field Values

THREAD_ID_MASK

public static final int THREAD_ID_MASK
Mask of the thread id in the status word.

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Constant Field Values

LOCK_COUNT_MASK

public static final int LOCK_COUNT_MASK
Mask of the lock count in the status word.

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Constant Field Values

LOCK_COUNT_INC

public static final int LOCK_COUNT_INC
Value to add to status word to increment lock count by one.

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Constant Field Values

LOCK_COUNT_SHIFT

public static final int LOCK_COUNT_SHIFT
Bit location of lock count in the status word.

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Constant Field Values

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.

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Constant Field Values
Constructor Detail

ObjectLayout

public ObjectLayout()