Module openj9.dtfj

Package com.ibm.dtfj.java.j9

Class JavaAbstractClass

java.lang.Object

com.ibm.dtfj.java.j9.JavaAbstractClass

All Implemented Interfaces:

JavaClass

Direct Known Subclasses:

JavaArrayClass, JavaClass

public abstract class JavaAbstractClass
extends Object
implements JavaClass

Field Summary

Fields

Modifier and Type	Field	Description
protected ImagePointer	_classPointer
protected JavaRuntime	_javaVM

Fields declared in interface com.ibm.dtfj.java.JavaClass

MODIFIERS_UNAVAILABLE

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	JavaAbstractClass(JavaRuntime vm, ImagePointer id, int modifiers, long loaderID, ImagePointer objectID, int flagOffset, int hashcodeSlot)

Method Summary

Modifier and Type	Method	Description
protected void	addClassLoaderReference(Collection coll)
protected void	addClassObjectReference(Collection coll)
void	addInterfaceName(String interfaceName)
protected void	addSuperclassReference(Collection coll)
int	getHashcodeSlotSize()	Returns the size of the extra slot needed for stored hashcode - if the object was moved - in JVMs built with J9VM_OPT_NEW_OBJECT_HASH.
abstract int	getInstanceSize(JavaObject instance)
int	readFlagsFromInstance(JavaObject instance)

Methods declared in class java.lang.Object

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

Methods declared in interface com.ibm.dtfj.java.JavaClass

equals, getClassLoader, getComponentType, getConstantPoolReferences, getDeclaredFields, getDeclaredMethods, getID, getInstanceSize, getInterfaces, getModifiers, getName, getObject, getProtectionDomain, getReferences, getSuperclass, hashCode, isArray

Field Detail

_classPointer

protected ImagePointer _classPointer

_javaVM

protected JavaRuntime _javaVM

Constructor Detail

JavaAbstractClass

protected JavaAbstractClass(JavaRuntime vm,
                            ImagePointer id,
                            int modifiers,
                            long loaderID,
                            ImagePointer objectID,
                            int flagOffset,
                            int hashcodeSlot)

Method Detail

addInterfaceName

public void addInterfaceName(String interfaceName)

getInstanceSize

public abstract int getInstanceSize(JavaObject instance)

Parameters:

instance - The instance is needed for array types to calculate the size of a per-instance basis

Returns:

The size, in bytes, of an instance of this class (required for iterating the heap)

getHashcodeSlotSize

public int getHashcodeSlotSize()

Returns the size of the extra slot needed for stored hashcode - if the object was moved - in JVMs built with J9VM_OPT_NEW_OBJECT_HASH. If the hashcode could fit in spare space in the object header, this will return 0. . *

Returns:

object instance size delta, in bytes

readFlagsFromInstance

public int readFlagsFromInstance(JavaObject instance)
                          throws MemoryAccessException,
                                 CorruptDataException

Throws:

MemoryAccessException

CorruptDataException

addClassLoaderReference

protected void addClassLoaderReference(Collection coll)

addSuperclassReference

protected void addSuperclassReference(Collection coll)

addClassObjectReference

protected void addClassObjectReference(Collection coll)