Class JCJavaObject

java.lang.Object
com.ibm.dtfj.java.javacore.JCJavaObject
All Implemented Interfaces:
JavaObject

public class JCJavaObject extends Object implements JavaObject
  • Constructor Details

  • Method Details

    • arraycopy

      public void arraycopy(int arg0, Object arg1, int arg2, int arg3) 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 interface JavaObject
      Parameters:
      arg0 - index in the receiver to start copying from
      arg1 - the destination array
      arg2 - index in the destination array to start copying into
      arg3 - the number of elements to be copied
      Throws:
      CorruptDataException
      MemoryAccessException
    • getArraySize

      public int getArraySize() throws CorruptDataException
      Description copied from interface: JavaObject
      Get the number of elements in this array.
      Specified by:
      getArraySize in interface JavaObject
      Returns:
      the number of elements in this array
      Throws:
      CorruptDataException
    • getHashcode

      public long getHashcode() throws DataUnavailable, CorruptDataException
      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 interface JavaObject
      Returns:
      the basic hash code of the object in the image
      Throws:
      DataUnavailable - if the hash code cannot be determined
      CorruptDataException
      See Also:
    • getID

      public ImagePointer 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 interface JavaObject
      Returns:
      the runtime-wide unique identifier for the object
    • getJavaClass

      public JavaClass getJavaClass() throws CorruptDataException
      Description copied from interface: JavaObject
      Get the JavaClass instance which represents the class of this object.
      Specified by:
      getJavaClass in interface JavaObject
      Returns:
      the JavaClass instance which represents the class of this object
      Throws:
      CorruptDataException
    • getPersistentHashcode

      public long getPersistentHashcode() throws DataUnavailable, CorruptDataException
      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 interface JavaObject
      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 snapshots
      CorruptDataException
      See Also:
    • getSections

      public Iterator 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 interface JavaObject
      Returns:
      a collection of sections that make up this object
      See Also:
    • getSize

      public long getSize() throws CorruptDataException
      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 interface JavaObject
      Throws:
      CorruptDataException
    • isArray

      public boolean isArray() throws CorruptDataException
      Description copied from interface: JavaObject
      Is this object an array?
      Specified by:
      isArray in interface JavaObject
      Returns:
      true if the receiver represents an instance of an array, or false otherwise
      Throws:
      CorruptDataException
    • getReferences

      public Iterator 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 interface JavaObject
      Returns:
      an iterator of JavaReference and CorruptData objects
      See Also:
    • getHeap

      public JavaHeap getHeap() throws DataUnavailable
      Description copied from interface: JavaObject
      Gets the heap where this object is located.
      Specified by:
      getHeap in interface JavaObject
      Returns:
      the JavaHeap instance representing the heap where this object is stored in memory
      Throws:
      DataUnavailable - if the heap information for this object is not available
      See Also: