IBM High Level Assembler

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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).


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[edit]

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
    • DO/ENDDO
  • A disassembler.
  • A "Program Understanding Tool" (re-engineering aid).
  • A Source XREF utility (cross-reference facility).
  • Interactive Debug Facility.
  • Enhanced SuperC (source comparison tool).

See also[edit]


  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.

External links[edit]