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).

Overview
HLASM was released in June 1992 replacing IBM's Assembler H Version 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: 
 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
 IBM Basic assembly language and successors

References

External links

 IBM HLASM Online Manuals
 

High-level
High Level Assembler
Assembly languages
Assembler High level
IBM mainframe software