Establishing an external symbol alias

You can instruct the assembler to use an alias for an external symbol in place of the external symbol itself, when it generates the object module. To do this you must code an ALIAS instruction which specifies the external symbol and the alias you want the assembler to use. The external symbol must be defined in a START, CSECT, RSECT, ENTRY, COM, DXD, external DSECT, EXTRN, or WXTRN instruction, or in a V-type address constant.

The following example shows how you use the ALIAS instruction to specify an alias for the external symbol EXMOD1.

         .
         .
         L     15,EX_SYM        Load address of external symbol
         BASR  14,15            Branch to it
         .
         .
EXMOD1   DS    0H               Using EXMOD1 as a name entry
         .
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EX_SYM   DC    V(EXMOD1)        Address of external symbol
EXMOD1   ALIAS C'XMD1PGM'       XMD1PGM is the real external name
         .
         .

See ALIAS instruction for information about the ALIAS instruction.