deep

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
====== Use of Index, Offset and Address of an Item ======

These fields have different meanings according to what a given item represents. 
**Note**: Statements in brackets denote a type, e.g. [Class] means an item of type ''org.deepjava.classItems.Class''.

==== Classes [Class] ====
  * //index//: Used to number interfaces, which contain methods called by //invokeinterface//.
  * //offset//: Not used, always -1.
  * //address//: Contains the absolute address of the type descriptor (field //size//).

==== Arrays [Array] ====
  * //index//: Not used, always -1.
  * //offset//: Offset in bytes of the type descriptor in the memory segment.
  * //address//: Contains the absolute address of the array type descriptor.

==== Methoden [Method] ====
  * //index//: If instance method -> index into method table (starting with 0), if class method -> always -1. //index// is set by the [[dev:crosscompiler:cfr|Class File Reader]].
  * //offset//: Offset in bytes of the method starting from the start address of the code of the class of this method.
  * //address//: Contains the absolute address of the method.

==== Fields [DataItem] ====
<box right 30% | IMPORTANT Constant References>
**Important:** With constant and static references the const flag //dpfConst// will not be set. Such fields must be handled like regular non constant fields because the class constructor will access such a field exactly once.
**Example:**
  static final Object o = new Object();
</box>
  - **Class fields [DataItem]:**
    - Constant fields [NamedConst]:
      * //index//: Not used, always -1.
      * //offset//: not used, always -1.
      * //address//: not used, always -1.
    - Non-constant fields [DataItem]:
      * //index//: not used, always -1.
      * //offset//: Offset in bytes (starting with 0 for the first field).
      * //address//: Contains the absolute address of the field.
  - **Instanz-Felder [DataItem]:**
    * //index//: Not used, always -1.
    * //offset//: Offset in bytes starting with 0 (fields of superclasses are accounted for).
    * //address//: Not used, always -1.

==== Constants [Constant] ====
  - **Numbers [StdConstant]:**
    * //index//: If of type //float// or //double// -> index in the const pool. Else always -1.
    * //offset//: If of type //float// or //double// -> offset in bytes in the const pool. Else always -1.
    * //address//: If of type //float// or //double// -> absolute address. Else always -1.
  - **Strings [StringLiteral]:**
    * //index//: Index in the string pool.
    * //offset//: Offset in bytes in the string pool.
    * //address//: Absolute address.
deep

User Tools

Site Tools

Page Tools
