IBM High Level Assembler

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Short description: Modern assembler for programs on IBM's z/Architecture systems


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).

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. While working at IBM, John Robert Ehrman created and was the lead developer for HLASM[lower-alpha 1] and is considered the "father of high level assembler".[4]

High Level Assembler Toolkit

The High Level Assembler Toolkit is a separately priced accompaniment to the High Level Assembler. The toolkit contains:[5]

  • 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).

See also

Notes

  1. ↑ HLASM followed a SHARE requirement to incorporate Greg Mushial's enhancements[3] to Assembler H into the supported product.

References

  1. ↑ IBM Corporation. "IBM High Level Assembler and Toolkit Feature - Release History". http://www-01.ibm.com/software/awdtools/hlasm/history.html. Retrieved October 21, 2012. 
  2. ↑ IBM Corporation (5 May 1992). "Announcement Letter 292-244: IBM HIGH LEVEL ASSEMBLER/MVS & VM & VSE". http://www-01.ibm.com/common/ssi/cgi-bin/ssialias?infotype=an&subtype=ca&htmlfid=897/ENUS292-244&language=enus. Retrieved October 21, 2012. 
  3. ↑ Greg Mushial (July 20, 1983), "Module 24: SLAC Enhancements to and Beautifications of the IBM H-Level Assembler for Version 2.8", SLAC VM NOTEBOOK (Stanford Linear Accelerator Center), https://www.gsf-soft.com/Documents/SLAC-MODS.html 
  4. ↑ "Guide to the John R. Ehrman collection". Online Archive of California. https://oac.cdlib.org/findaid/ark:/13030/c8xk8mnr/.  [1]
  5. ↑ IBM Corporation. "Toolkit Feature components". http://publib.boulder.ibm.com/infocenter/zos/v1r12/index.jsp?topic=%2Fcom.ibm.zos.r12.asmk200%2Fasmtug20.htm. Retrieved October 21, 2012. 

External links





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