PLEX (programming language): Difference between revisions

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Revision as of 18:30, 25 February 2020

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[[File:Mobile Switching Centre-Ericsson AXE.jpg|thumb|Ericsson AXE]]

'''PLEX''' (Programming Language for EXchanges) is a special-purpose, concurrent, real-time [[programming language]]. The PLEX language is closely tied to the architecture of Ericsson's [[AXE telephone exchange]]s which it was designed to control. PLEX was developed by Göran Hemdahl at [[Ericsson]] in the 1970s,<ref name=ErlangHistory>{{cite web |url= http://www.cs.chalmers.se/Cs/Grundutb/Kurser/ppxt/HT2007/general/languages/armstrong-erlang_history.pdf|title= A History of Erlang|accessdate=2009-03-07 |author= Joe Armstrong|date= |work= |publisher=Ericsson AB}}</ref> and it has been continuously evolving since then.<ref name=Semantics>{{cite web |url= http://cdc.ioc.ee/appsem04/webproc/short/erikson-lisper.pdf|title= A Formal Semantics for PLEX|accessdate=2009-03-07 |author= Johan Erikson and Björn Lisper|date= |work= |publisher=Mälardalen University}}</ref> PLEX was described in 2008 as "a cross between [[Fortran]] and a [[Assembly_language#Macros|macro assembler]]."<ref>{{cite web|last1=Hague|first1=James|title=My Road to Erlang|url=httphttps://prog21.dadgum.com/22.html|website=Programming in the 21st Century}}</ref>

The language has two variants: ''Plex-C'' used for the AXE Central Processor (CP) and ''Plex-M'' used for Extension Module Regional Processors (EMRP).<ref name=Execution>{{cite web |url= http://www.mrtc.mdh.se/publications/0802.pdf|title= The Execution Model of APZ/PLEX - An Informal Description|accessdate=2009-03-07 |author= Johan Erikson and Bo Lindell|date= |work= |publisher=Mälardalen University}}</ref>

According to [[Erlang (programming language)|Erlang]] programming language co-creator [[Joe Armstrong (programmer)|Joe Armstrong]], "Erlang was heavily influenced by PLEX and the AXE design."<ref name=ErlangHistory/>

==Execution model==

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==Pre-compilers==

{{Unreferenced section|date=February 2020}}

Several [[precompiler]]s or code generators exist, to produce [[source code]] in ''Plex-C'' from [[High-level programming language|higher level]] languages or graphical models.{{Citation needed|date=August 2010}} These can generate ''Plex-C'' from:

Several [[precompiler]]s or code generators exist, to produce [[source code]] in ''Plex-C'' from [[High-level programming language|higher level]] languages or graphical models.{{Citation needed|date=August 2010}} These can generate ''Plex-C'' from:

* [[Specification and Description Language]] graphical representation (SDL/GR)

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==References==

{{Reflist}}|refs=

<ref name=ErlangHistory>{{cite web |url=http://www.cse.chalmers.se/edu/year/2009/course/TDA381_Concurrent_Programming/ARCHIVE/VT2009/general/languages/armstrong-erlang_history.pdf|title=A History of Erlang|accessdate=2009-03-07 |author=Joe Armstrong|date= |work= |publisher=Ericsson AB}}</ref>

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