Class PHDJavaObject
java.lang.Object
com.ibm.dtfj.phd.PHDJavaObject
- All Implemented Interfaces:
JavaObject
-
Nested Class Summary
Modifier and TypeClassDescriptionstatic class
The constructors for PHDJavaObject used to take up to 11 arguments, many of which were ints. -
Field Summary
Modifier and TypeFieldDescriptionstatic final long
instance size is an unsigned int in the datastream, so -1L is a value that cannot collide -
Constructor Summary
-
Method Summary
Modifier and TypeMethodDescriptionvoid
Copies data from the image array into a local Java array.boolean
Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.int
Get the number of elements in this array.long
Fetch the basic hash code for the object.getHeap()
Gets the heap where this object is located.getID()
The ID of an object is a unique address is memory which identifies the object.Get the JavaClass instance which represents the class of this object.long
Fetch the basic hash code of the object in the image.Get the set of references from this object.An object is represented in the Java runtime by one or more regions of memory.long
getSize()
Get the number of bytes of memory occupied by this object on the heap.int
hashCode()
Answers an integer hash code for the receiver.boolean
isArray()
Is this object an array?
-
Field Details
-
UNSPECIFIED_INSTANCE_SIZE
public static final long UNSPECIFIED_INSTANCE_SIZEinstance size is an unsigned int in the datastream, so -1L is a value that cannot collide- See Also:
-
-
Constructor Details
-
PHDJavaObject
-
-
Method Details
-
arraycopy
public void arraycopy(int srcStart, Object dst, int dstStart, int length) throws CorruptDataException, MemoryAccessException Description copied from interface:JavaObject
Copies data from the image array into a local Java array. The dst object must be an array of the appropriate type -- a base type array for base types, or a JavaObject array for reference arrays.- Specified by:
arraycopy
in interfaceJavaObject
- Parameters:
srcStart
- index in the receiver to start copying fromdst
- the destination arraydstStart
- index in the destination array to start copying intolength
- the number of elements to be copied- Throws:
CorruptDataException
MemoryAccessException
-
getArraySize
Description copied from interface:JavaObject
Get the number of elements in this array.- Specified by:
getArraySize
in interfaceJavaObject
- Returns:
- the number of elements in this array
- Throws:
CorruptDataException
-
getHashcode
Description copied from interface:JavaObject
Fetch the basic hash code for the object. This is the hash code which would be returned if a Java thread had requested it. Typically the hash code is based on the address of an object, and may change if the object is moved by a garbage collection cycle.- Specified by:
getHashcode
in interfaceJavaObject
- Returns:
- the basic hash code of the object in the image
- Throws:
DataUnavailable
- if the hash code cannot be determinedCorruptDataException
- See Also:
-
getHeap
Description copied from interface:JavaObject
Gets the heap where this object is located.- Specified by:
getHeap
in interfaceJavaObject
- Returns:
- the
JavaHeap
instance representing the heap where this object is stored in memory - Throws:
CorruptDataException
- if the heap information for this object is corruptDataUnavailable
- if the heap information for this object is not available- See Also:
-
getID
Description copied from interface:JavaObject
The ID of an object is a unique address is memory which identifies the object. The data at this memory is implementation defined. The object may be non-contiguous. Portions of the object may appear below or above this address.- Specified by:
getID
in interfaceJavaObject
- Returns:
- the runtime-wide unique identifier for the object
-
getJavaClass
Description copied from interface:JavaObject
Get the JavaClass instance which represents the class of this object.- Specified by:
getJavaClass
in interfaceJavaObject
- Returns:
- the JavaClass instance which represents the class of this object
- Throws:
CorruptDataException
-
getPersistentHashcode
Description copied from interface:JavaObject
Fetch the basic hash code of the object in the image. This hash code is guaranteed to be persistent between multiple snapshots of the same Image. If the hash code cannot be determined, or if the hash code for this object could change between snapshots, an exception is thrown.If the VM uses a 'hasBeenHashed' bit, the value of this bit can be inferred by calling getPersistentHashcode(). If the persistent hash code is not available, then the 'hasBeenHashed' bit has not been set, and the hash of the object could change if the object moves between snapshots
- Specified by:
getPersistentHashcode
in interfaceJavaObject
- Returns:
- the basic hash code of the object in the image
- Throws:
DataUnavailable
- if a hash code cannot be determined, or if the hash code could change between successive snapshotsCorruptDataException
- See Also:
-
getReferences
Description copied from interface:JavaObject
Get the set of references from this object. Corrupt references will be returned as CorruptData objects by the Iterator.- Specified by:
getReferences
in interfaceJavaObject
- Returns:
- an iterator of JavaReference and CorruptData objects
- See Also:
-
getSections
Description copied from interface:JavaObject
An object is represented in the Java runtime by one or more regions of memory. These include the object's header and the data in the object. In certain allocation strategies, an object's header and data may be allocated contiguously. In this case, this method may return an iterator for a single section. In other schemes, the header may be separate from the data or the data may be broken up into multiple regions. Additionally, this function does not guarantee that the memory used by this object is not also shared by one or more other objects. Callers should not make any assumptions about the contents of the memory.- Specified by:
getSections
in interfaceJavaObject
- Returns:
- a collection of sections that make up this object
- See Also:
-
getSize
Description copied from interface:JavaObject
Get the number of bytes of memory occupied by this object on the heap. The memory may not necessarily be contiguous.- Specified by:
getSize
in interfaceJavaObject
- Throws:
CorruptDataException
-
isArray
Description copied from interface:JavaObject
Is this object an array?- Specified by:
isArray
in interfaceJavaObject
- Returns:
- true if the receiver represents an instance of an array, or false otherwise
- Throws:
CorruptDataException
-
equals
Description copied from interface:JavaObject
Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison. The implementation in Object answers true only if the argument is the exact same object as the receiver (==).- Specified by:
equals
in interfaceJavaObject
- Overrides:
equals
in classObject
- Parameters:
o
- Object the object to compare with this object.- Returns:
- boolean
true
if the object is the same as this objectfalse
if it is different from this object. - See Also:
-
hashCode
public int hashCode()Description copied from interface:JavaObject
Answers an integer hash code for the receiver. Any two objects which answertrue
when passed to.equals
must answer the same value for this method.- Specified by:
hashCode
in interfaceJavaObject
- Overrides:
hashCode
in classObject
- Returns:
- the receiver's hash.
- See Also:
-