HLASM Language Reference
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Length constant—J

HLASM Language Reference
SC26-4940-06

Use this constant to reserve storage for the length of a DXD, class, or DSECT. The assembler fills the field with binary zeros, and the length is entered into this space by the linker. This constant is only available if the GOFF option is specified.

In the following example, the value at A is the length of CLASS. 
A        DC              J(CLASS)

The DXD or DSECT names referenced in the J-type length constant need not be previously defined.

Table 1. J length constants
Subfield Value Example Result
1. Duplication factor Allowed    
2. Type J    
3. Type Extension D    
4. Program type Allowed    

5. Modifiers
   Implicit length:
   (length modifier
   not present)

 
J-type: 4 bytes
JD-type: 8 bytes

    

   Alignment:
   (Length modifier
   not present)

J-type: Fullword
JD-type: Doubleword

    
Range for length:

J-type: 2 to 4 bytes,
        or 8
JD-type: 2 to 4 bytes,
        or 8
(no bit length)

    
Range for scale: Not allowed    
Range for exponent: Not allowed    

6. Nominal value
   Represented by:

 
A single DXD, class,
or DSECT name

 
 
DC  J(CLASS)
  
Enclosed by: Parentheses    
Exponent allowed: No    

   Number of values
   per operand:

 Multiple    
Padding: None.    

   Truncation of
   assembled value:

 At left    
Parent topic: Offset and length constants

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