IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > Using Heapdump > Portable Heap Dump (PHD) file format

PHD class records

The PHD class record encodes a class object.

Class record

The format of a class record is:

• The 1 byte tag, containing the value 6.
• A "byte" containing flags, with these bits in descending order:
  • 2 bits to indicate whether the gap is a "byte", "short", "int" or "long".
  • 2 bits indicating the size of each static reference. For more information, see the description in the short record format.
  • 1 bit indicating if the object was hashed and moved. If this bit is set, the record includes the hashcode.

• A "byte", "short", "int" or "long" containing the gap between the address of this class and the address of the preceding object. For more information, see the description in the short record format.
• An "int" containing the instance size.
• If all objects are hashed, a "short" containing the hashcode. Otherwise, an optional "int" containing the hashcode if the hashed and moved bit is set in the record flag byte.
• A "word" containing the address of the superclass.
• A UTF string containing the name of this class.
• An "int" containing the number of static references.
• The array of static references. For more information, see the description in the short record format.

Parent: Portable Heap Dump (PHD) file format

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