Interface JavaObject
- All Known Implementing Classes:
CorruptJavaObject
,DTFJJavaObject
,JavaObject
,JCJavaObject
,PHDJavaObject
public interface JavaObject
Represents a Java Object.
-
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?
-
Method Details
-
getJavaClass
Get the JavaClass instance which represents the class of this object.- Returns:
- the JavaClass instance which represents the class of this object
- Throws:
CorruptDataException
-
isArray
Is this object an array?- Returns:
- true if the receiver represents an instance of an array, or false otherwise
- Throws:
CorruptDataException
-
getArraySize
Get the number of elements in this array.- Returns:
- the number of elements in this array
- Throws:
CorruptDataException
IllegalArgumentException
- if the receiver is not an array
-
arraycopy
void arraycopy(int srcStart, Object dst, int dstStart, int length) throws CorruptDataException, MemoryAccessException 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.- 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
NullPointerException
- if dst is nullIllegalArgumentException
- if the receiver is not an array, or if dst is not an array of the appropriate typeIndexOutOfBoundsException
- if srcStart, dstStart, or length are out of bounds in either the receiver or the destination array
-
getSize
Get the number of bytes of memory occupied by this object on the heap. The memory may not necessarily be contiguous.- Throws:
CorruptDataException
-
getHashcode
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.- Returns:
- the basic hash code of the object in the image
- Throws:
DataUnavailable
- if the hash code cannot be determinedCorruptDataException
- See Also:
-
getPersistentHashcode
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
- 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:
-
getID
ImagePointer getID()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.- Returns:
- the runtime-wide unique identifier for the object
-
getSections
Iterator getSections()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.- Returns:
- a collection of sections that make up this object
- See Also:
-
getReferences
Iterator getReferences()Get the set of references from this object. Corrupt references will be returned as CorruptData objects by the Iterator.- Returns:
- an iterator of JavaReference and CorruptData objects
- See Also:
-
getHeap
Gets the heap where this object is located.- 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:
-
equals
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 (==). -
hashCode
-