IBM High Level Assembler

High Level Assembler or HLASM is IBM's current assembler programming language for its z/OS, z/VSE, z/VM and z/TPF operating systems on z/Architecture mainframe computers. There is also a version that runs on Linux, primarily intended for systems running on a z/Architecture system (this environment is sometimes referred to as Linux on IBM Z).

For a discussion of high-level assemblers in general, see High-level assembler.

Overview

HLASM was released in June 1992 replacing IBM's Assembler H Version 2.[1][2] Despite the name, HLASM on its own does not have many of the features normally associated with a high-level assembler, but does offer a number of improvements over Assembler H and Assembler(XF), such as labeled and dependent USINGs, more complete cross-reference information, and additional macro language capabilities such as the ability to write user-defined functions.

High Level Assembler Toolkit

The High Level Assembler Toolkit is a separately priced accompaniment to the High Level Assembler. The toolkit contains:[3]

  • A set of structured programming macros —
    • IF/ELSE/ENDIF
    • DO/ENDDO
    • STRTSRCH/ORELSE/ENDLOOP/ENDSRCH
    • CASENTRY/CASE/ENDCASE
    • SELECT/WHEN/OTHRWISE/ENDSEL.
  • A disassembler.
  • A "Program Understanding Tool" (re-engineering aid).
  • A Source XREF utility (cross-reference facility).
  • Interactive Debug Facility.
  • Enhanced SuperC (source comparison tool).

References
  1. IBM Corporation. "IBM High Level Assembler and Toolkit Feature - Release History". Retrieved October 21, 2012.
  2. IBM Corporation. "Announcement Letter 292-244: IBM HIGH LEVEL ASSEMBLER/MVS & VM & VSE". Retrieved October 21, 2012.
  3. IBM Corporation. "Toolkit Feature components". Retrieved October 21, 2012.

See also


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